奥地利专利AT520567A1 Method for monitoring an elevator car

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专利摘要:
In order to achieve a method for monitoring an elevator car (3) by means of at least one optical sensor (9) which functions stably even with a plurality of detected objects and is characterized by a low susceptibility to errors, it is proposed according to the invention that the at least one optical sensor (9) 9) detects image data in a monitoring area of the elevator car (3), the detected image data being compared with at least one reference image of the monitoring area in an evaluation device (6) in order to carry out the following steps: detecting the access of objects to the surveillance area; - detecting the departure of objects from the surveillance area; wherein - an occlusion entry is activated when the object is no longer detected by the at least one optical sensor (9); - the occlusion entry is deactivated when the object is retrieved by the at least one optical sensor (9); wherein an alerting procedure is triggered when - a data object has not been deactivated in a predefined period of time after its activation and the data object has no active concealment entry.
公开号:AT520567A1
申请号:T50878/2017
申请日:2017-10-17
公开日:2019-05-15
发明作者:Schober Johannes；Krauss Oliver；Hannes Schuler Andreas；Wilfing Daniel
申请人:View Promotion Gmbh；
IPC主号:

专利说明:

SUMMARY
In order to achieve a method for monitoring an elevator car (3) by means of at least one optical sensor (9), which functions stably even with a plurality of detected objects and is characterized by a low susceptibility to errors, the invention proposes that the at least one optical sensor ( 9) Image data acquired in a monitoring area of the elevator car (3), the captured image data being compared with at least one reference image of the monitoring area in an evaluation device (6) in order to carry out the following steps:
- detecting the access of objects to the surveillance area;
- Detecting the departure of objects from the surveillance area;
in which
- a concealment entry is activated when the object is no longer detected by the at least one optical sensor (9);
- The concealment entry is deactivated when the object is detected again by the at least one optical sensor (9);
an alarm procedure is triggered if
a data object was not deactivated in a predefined period of time after its activation and the data object has no active concealment entry.
(Fig. 1) / 52
Lf / lf / S00247
METHOD FOR MONITORING A LIFT CABIN
FIELD OF THE INVENTION
The invention relates to a method for monitoring an elevator car by means of at least one optical sensor, the at least one optical sensor recording image data in a monitoring area of the elevator car, the recorded image data being transmitted via a first data connection to an evaluation device arranged in the elevator car, in which Evaluation device, the captured image data are compared with at least one reference image of the monitoring area.
STATE OF THE ART
As is generally known, an elevator system is used to transport objects, namely people and / or objects, between different floors of a building and is to be attributed to the technical field of discontinuous conveyors. For this purpose, an elevator installation can comprise one or more elevator cars, in the interior of which the passengers or objects are transported. As a rule, elevator cabs have an elevator door which is open for the entry or exit of a person or for loading or unloading an object and which is closed during the movement between the floors. Several elevator systems can also be provided in a building, which have different areas of application.
The need to monitor the interior of an elevator car exists for reasons of passenger safety, since an elevator car forms a closed system when the elevator door is closed and cannot be seen from the outside. If an event occurs that is not part of normal operation, for example a case of illness of a person in the elevator car or a conspicuous behavior of a person in the elevator car, this event / 52 can be monitored by the elevator car using at least one optical sensor are detected and appropriate steps are taken. In the past, cameras connected to a monitoring room, for example, were installed for this purpose in the elevator car, which transmitted the captured images to a monitoring room for monitoring by an elevator attendant.
In order to automate the monitoring of the interior of the elevator car by means of at least one optical sensor, it is crucial that on the one hand objects reaching the monitoring area are reliably identified, that is to say the access of objects is detected, and on the other hand that objects removed from the monitoring area are no longer monitored monitoring is ended after an object has left.
For example, WO 2016/085795 A1 discloses a system for monitoring the interior of an elevator car or an entry area in front of the elevator car, at least one part of the body being tracked by persons in the monitoring area using an optical sensor in order to decide on the basis of predefined parameters whether in the Elevator car an emergency has occurred.
A disadvantage of the prior art is that the stability of the proposed monitoring system decreases, the more objects are in the elevator car. If a first object is covered by a second object, ie if the second object is in the line of sight between the optical sensor and the first object, it is no longer possible to detect body parts of the first object, so that an emergency may not be detected by the system becomes.
OBJECT OF THE INVENTION
It is therefore an object of the invention to overcome the disadvantages of the prior art and a method for / 52
To propose monitoring of an elevator car, which functions stably even with a large number of objects located in the monitoring area. Another task is to reduce the number of incorrect triggering of alarm procedures.
PRESENTATION OF THE INVENTION
This object is achieved in a method according to the invention for monitoring an elevator car by means of at least one optical sensor in that the at least one optical sensor captures image data in a monitoring area of the elevator car, the captured image data being transmitted via a first data connection to an evaluation device arranged in the elevator car , wherein the captured image data are compared in the evaluation device with at least one reference image of the monitoring area in order to carry out the following steps:
- Detecting the access of objects to the monitoring area and at least one recognition feature for each detected object, wherein a data object is activated in a data memory for each detected object and the at least one recognition feature is stored in the data object;
- Detecting the departure of objects from the surveillance area, the data object assigned to the departed object being deactivated;
in which
a concealment entry is activated in the data object of an object when the object is no longer detected by the at least one optical sensor without the departure of the object having been detected;
- The masking entry in the data object of an object is deactivated when the object is detected again by the at least one optical sensor;
an alarm procedure is triggered if
a data object was not deactivated in a predefined period of time after its activation and the data object has no active concealment entry.
/ 52
Subsequently, in the context of the invention, the term “activate a data object” means that the evaluation device is an active data object, that is to say a data object whose associated object is potentially in the monitoring area and is being monitored, by a deactivated data object, that is to say a data object whose assigned object is no longer in the monitoring area and is no longer monitored. It is not critical whether the data object is actually regenerated when activated or whether an existing data object only receives a positive activity entry. The same applies to the “activation of the various entries of the data objects, these can either be regenerated or only put into an active status.
Likewise, in the context of the invention, the term “deactivating a data object” means that the evaluation device processes this data object as inactive, that is, treats the assigned object as not in the monitoring area and accordingly no longer monitors it. Here too, either the data object for deactivation can be deleted in the evaluation device or the data object is retained, but provided with a negative activity entry. The same applies to the "deactivation of the various entries of the data objects, these can either be deleted or only put into an inactive status.
The principle of object detection on which the monitoring method according to the invention is based is based on a comparison of the image data recorded by the at least one optical sensor with at least one reference image. As a rule, the reference image shows the interior of the elevator car or large parts thereof, and - depending on the arrangement of the at least one optical sensor - possibly also a front area of the elevator car, provided the elevator door on the reference image is open. For precise monitoring / 52, it is fundamentally advantageous if a large number of reference images form the basis of the comparison, for example in different lighting conditions and / or for different floors. As a rule, the reference images are selected so that there are no objects in the monitoring area that are to be detected later. In other words, the at least one reference image preferably shows an empty elevator car or an empty pre-area.
In a preferred embodiment of the invention it is provided that at least two reference images are provided, at least one first reference image showing the monitoring area when the elevator door of the elevator car is open and at least one second reference image showing the monitoring area when the elevator door of the elevator car is closed. On the one hand, this enables the evaluation device to detect whether the elevator door is closed or open solely on the basis of the comparison of the image data; Another advantage is that the lighting conditions changed by the open elevator door can be taken into account.
If the access of an object is determined by means of the image comparison, a data object assigned to the detected object is activated. Access will advantageously take place, in particular, when the elevator door is open. Objects that have entered concealed can be detected for the first time even when the elevator door is closed.
In order to be able to track the object as clearly as possible in the monitoring area, at least one recognition feature of the object is recorded and stored in the data object of the respective detected object. A plurality of recognition features are preferably stored and / or the recognition features are updated continuously, since other recognition features become visible during a movement such as a rotation of the object, or the originally / 52 stored recognition features may no longer be visible.
As soon as an exit of the object from the monitoring area is detected, in particular when an object leaves the elevator car or the monitoring area through the opened elevator door, the data object assigned to the object is deactivated and the monitoring of this object is thus ended.
Basically, it would now be conceivable that the evaluation device records an activation time for each data object and triggers an alarm procedure each time when no departure of the object has been detected and a predefined period of time has passed since the activation of the data object, for example a timer has expired. However, this procedure would lead to an increased number of faulty trips, especially if there are an above-average number of objects in the elevator car, since an object could be covered and its departure was not detected by at least one optical sensor. In the simplest case, the alarm procedure comprises sending a message to a responsible reporting point, for example an emergency call center or a maintenance center, it also being conceivable to output information in the elevator car.
In order to ensure the stability of the system in the case of a plurality of objects in the monitoring area and at the same time to reduce the number of incorrect triggering of an alarm procedure, a concealment entry is activated in the data object of a concealed object when the object is no longer detected by the at least one optical sensor without the departure of the object, that is to say the regular detection of the exit from the elevator car, being detected. The evaluation device can therefore make improved decisions based on the additional information that an object is in the monitoring area with a high probability but is not detected by the at least one sensor, as explained in more detail below.
At the same time, the continuous monitoring of the monitoring area when the objects change their position within the monitoring area, that is to say, for example, if a second object preventing the detection of a first object changes its position relative to the at least one optical sensor, also the first object, the associated data object of which active cover entry, be recorded again. In this case, the concealment entry is deactivated because the object is now detected by the sensor again. Among other things, the stored at least one recognition feature is decisive for the recognition. The same applies accordingly to the re-acquisition of several hidden objects.
Since the evaluation device therefore has additional information on the basis of the decision as to whether or not an alarm procedure should be triggered, the alarm procedure is only triggered when an object is not covered and the predefined period of time has expired is. On the one hand, concealed objects that leave the monitoring area without their departure being explicitly detected are quasi sorted out, since they no longer trigger an alarm procedure. At the same time, the duration for triggering an alarm procedure for objects that were covered for a certain period of time is reduced, since these are not re-recorded, but are only deactivated when the cover entry is re-registered. Accordingly, the predefined time period does not start again when the data is re-entered, but continues to be recorded in the background. For example, it may be that a detected object is left in the elevator car, but was at least temporarily concealed, that is to say has an active concealment entry. If the object is recaptured after the predefined period of time has elapsed - ie if the concealment entry is deactivated, the alarm procedure / 52 is triggered immediately. If the object is grasped before the predefined period of time has elapsed, the alarm procedure is only triggered if the predefined period of time has elapsed and the object still has no active concealment entry at this time.
The triggered alarm procedure can preferably have at least one of the following steps, preferably several steps are carried out in succession:
- Establishing a communication connection between the evaluation device or a server connected to the communication device and an emergency call center via a communication network;
The emergency call center can be, for example, an emergency call point for emergency services, such as the police, fire brigade or rescue, or a security service which is provided for monitoring the elevator system. Such an alarm procedure is particularly useful in the case of events such as fainting, fire or physical attacks.
- Establishing a communication connection between the evaluation device or a server connected to the communication device with the evaluation device and a maintenance center via a communication network;
A maintenance center can be notified in particular if a technical defect has been detected in the elevator car, for example with regard to the lighting of the elevator car or the opening of the elevator door or if the elevator car is heavily soiled or
Vandalism.
- Transmission of information to the evaluation device; For example, information can be displayed on a display device arranged in the elevator car or output via a loudspeaker. It is also conceivable that the evaluation device is tested or updated by the transmitted information.
- Establishing a communication connection between the evaluation device or a server connected to the communication device and a smartphone app via a communication network.
/ 52
For example, security forces or maintenance personnel located in the vicinity of the elevator car can be alerted via the app and directed to the corresponding elevator car.
In one embodiment variant of the invention, the following step is carried out in the evaluation device:
- Identify whether a detected object is an object or a person, a corresponding identification entry being activated in the data object.
For example, the detected objects can be identified by means of face recognition, so that every object in which a face is recognized is identified as a person. It would also be conceivable that different movement patterns can be used to distinguish whether it is an object or a person. In addition, an object can be identified as an object or person via a comparison with an object database.
In a further embodiment variant of the invention it is provided that after the identification of an object and / or a person a classification into different object classes or person classes takes place, the classification being stored in the identification entry.
For example, facial recognition and / or the recognition of biometric data can be used to identify whether a person is a man, a woman or a child. In addition, it is also possible to identify people with reduced mobility, for example wheelchair users or people with walking aids, based on the movement patterns. With regard to objects, the classification can take place, for example, by means of a stored object database, for example to classify luggage such as suitcases, bags and / or backpacks as such.
/ 52
Based on the additional information of the identification entry, it is possible in a preferred embodiment variant that different alarm procedures are triggered depending on the identification entry and / or that the predefined time period is defined differently for each identification entry. The identification entry thus makes it possible to adapt both the alarm procedure and the predefined time periods to the identified or classified object. For example, in the case of a child who is registered without an accompanying person, the security service can be alerted first, or the time until the alarm procedure is triggered can be shortened considerably. Likewise, it is also conceivable that, for example, at airports, objects that are recorded alone, in particular pieces of luggage, only have a greatly shortened period of time or that the emergency services are immediately informed and, if necessary, an announcement is triggered.
In order to be able to react appropriately to extraordinary events without waiting for the predefined time period to expire, it is provided in a further embodiment variant of the invention that the predefined time period is interrupted and the alarm procedure is triggered if, in addition to the presence of at least one person is detected without active cover entry one of the following operating situations is detected:
- Changing the lighting conditions in the surveillance area when the elevator car door is closed;
- No opening of the elevator door of the elevator car for a predefined maximum duration.
In modern elevator cars, the light inside the elevator car is usually dimmed or switched off if the elevator car has been inactive for a long period of time. Therefore, if a person is inside the surveillance area with the elevator door closed and the light is dim, it must be assumed that the person / 52 is not conscious and the alarm procedure must be initiated immediately.
Likewise, due to a non-opening of the elevator door over a maximum duration, for example the mere travel time from the bottom to the top floor, may indicate a malfunction of the elevator car if at least one person is still in the elevator. Correspondingly, trapped people can be freed by assistants who have been informed by means of the triggered alarm procedure.
In order to improve the monitoring and tracking of objects in the monitoring area, it is provided in a further preferred embodiment variant of the invention that the at least one optical sensor comprises a depth camera and the following step is carried out in the evaluation device:
- Detection of position data of the detected objects for determining a position of the objects within the monitoring area, at least the current position data being stored in the data object;
the position data being used to verify the activation and / or deactivation of the concealment entries.
Using the position data recorded via the depth camera, for example, a three-dimensional model of the elevator car and the objects located therein can be generated, which simplifies both the tracking of objects and the detection of hidden objects. On the basis of the recorded position data of an object with an active concealment entry, the probability of a re-acquisition can be increased if the concealing object changes its position while the concealed object remains in the area of the last recorded position. Likewise, the correct identification of the concealment of an object can be improved if the position of a first object changes in such a way that the position of a second, / 52 concealing object suggests a concealment of the first object.
The at least one optical sensor preferably comprises a, preferably controllable and / or digitally evaluable, video camera and a depth camera, the depth camera comprising an infrared laser projector and a monochromatic CMOS sensor.
As already mentioned above, the information as to whether the elevator door is closed or opened can improve monitoring and image comparison, in particular with regard to the lighting conditions in the elevator car, to a possibly pre-recorded area of the elevator car or to the detection of a regular access. or leaving an object. On the one hand, the information about the state of the elevator door can be recorded directly by the evaluation device, for example by means of several reference images in which the elevator door is opened at least once and closed at least once. However, it is also conceivable that the evaluation device is connected to a corresponding sensor in the elevator car or is connected to an elevator control device and thus indirectly detects the information. It is therefore provided in a further preferred embodiment variant of the invention that the evaluation device detects, directly or indirectly, whether an elevator door of the elevator car is open or closed, the departure of objects being detected only when the elevator door of the elevator car is open. While a regular exit of an object can only take place when the elevator door is open, access can in principle also be recorded while the vehicle is moving, namely when the object has entered the monitoring area under cover and is only detected by the sensor while the vehicle is in motion. In principle, however, it is advantageous if the section of the monitoring area assigned to the elevator door also has a high sensitivity for the detection of accesses when the elevator door is open.
/ 52
In order to match the at least one reference image, preferably the plurality of reference images, as precisely as possible to the local conditions at the place of use of the elevator car, it is provided in a particularly preferred embodiment variant that the at least one reference image in the context of at least one calibration run of the elevator car by the at least one optical sensor is detected and / or that the at least one reference image is imported from a database. It is particularly advantageous if at least one reference image is acquired on each floor when the elevator door is open, in order to include the front areas of the elevator car and the lighting conditions. The reference images can be further improved in that several calibration runs are carried out at different times of the day, which means that the change in lighting conditions can also be incorporated throughout the day. It is also conceivable that a database with reference images is created for several identical elevator cars and that these do not have to be recorded for each object by means of one or more calibration runs.
The definition of the predefined period of time after which an alarm procedure is triggered, provided that the data object does not have an active concealment entry, can in the simplest case be a period of time predefined, for example by the operator of the elevator system, for example 3 minutes, 5 minutes, 10 minutes or 15 minutes. While a shorter time requires a faster reaction time to a safety-relevant event, the number of incorrect detections can increase if the time period is not adapted to the circumstances of the location of the elevator car. Accordingly, it is provided in a first preferred embodiment variant of the invention that the predefined time period corresponds to the time that the elevator car takes to travel from a bottom to a top floor, preferably plus an additional value for a stay of the elevator car on one or more floors storeys. The predefined time period is therefore dependent on a maximum travel time of the elevator car. Because basically the elevator car in every / 52nd
Floor, it is advantageous if a surcharge value for the stay in one floor or in several or all floors is included. The surcharge value can either represent a maximum value, which corresponds to a stop on all floors, or an average value depending on the driving behavior of the elevator car. Such a definition of the predefined period of time can take place regardless of whether the evaluation device receives information about the current floor from a lift control or a position sensor.
According to a second preferred embodiment of the invention, it is provided that the evaluation device detects directly or indirectly on which floor the elevator car is located and the predefined time period corresponds to the time that elapses between the creation of the data object and the second reversal of the direction of the elevator car or the predefined time period of that time Corresponds to the time that elapses between the creation of the data object and the passage of the elevator car to the floor on which the data object was created. In this context, direct or indirect detection also means that the floor is either detected directly by the evaluation device via the image evaluation or that the evaluation device is connected to a position sensor or an elevator control. If an object in the upward movement of the elevator car gets into the elevator car, but actually wants to go down, there is a first reversal of direction when the upward movement has ended and a second reversal of direction when the downward movement has ended. When the downward movement has ended, it must be assumed that the object has reached its destination floor and should have left the elevator car. If an object climbs in the downward movement and actually wants to go down, it can be assumed that the object should no longer be in the elevator car when it drives past the floor on which it was detected. It is particularly advantageous if the evaluation device and the / 52
Elevator control a target floor can be assigned to each object.
In order to improve the algorithms for detecting a concealment and for triggering an alarm procedure, it is provided in a further embodiment variant of the invention that at the end of the alarm procedure it is checked whether an event justifying the triggering of the alarm procedure has taken place, parameter values being the triggering of the alarm procedure are stored together with the result of the check in order to avoid future false detections. The check can be carried out, for example, by entering an alarmed security or emergency worker who confirms whether an unconscious person or an object left behind was actually in the elevator car. On the basis of this information, the confidence intervals of the recorded parameters can be adjusted in order to either trigger an alarm procedure in the future for similar comparison values or to refrain from doing so. It is advantageous if the evaluation device communicates with at least one server via at least one first communication network in order to be able to adapt the confidence intervals for several elevators.
In order to ensure that data objects with an active concealment entry, the associated objects of which have left the monitoring area without being detected by the at least one optical sensor, do not remain activated for an indefinite period of time According to the invention, it is provided that all data objects are deactivated when no object is detected in the monitoring area and / or that a data object with an active concealment entry is deactivated after a predefined maximum duration. In the first case, an empty elevator car is detected because there are no objects in the monitoring area. This means that there is no longer any hidden object in the elevator, so that all still active data objects / 52 are deactivated accordingly. In the second case, which can occur if the elevator car is heavily frequented, a data object with active cover entry is deactivated after a maximum duration, e.g. after 30 minutes, because on the one hand such a long-lasting non-detection is unlikely and on the other hand one of the People would have reacted, so that a hidden exit is suspected.
In order to adapt the monitoring area, in which objects are detected and monitored, exactly to the conditions of the current elevator car, it is provided in a further particularly preferred embodiment variant that the monitoring area is determined on the basis of the at least one reference image as a function of an interior space and / or a front area of the elevator car becomes. The probability that an object is detected which is actually a fixed component of the elevator car and / or of a front area of the elevator car can thus be greatly reduced. For example, glass walls or mirrored walls of the elevator car can thus be taken into account. It is also possible to exclude objects in the elevator, such as handrails or (folding) seats, from the surveillance area. It is also possible for objects or objects located in the front area of the elevator car to be excluded from the monitoring area
As a compact and modular system by means of which the above-mentioned tasks are solved and by means of which elevator cars from different manufacturers can be equipped or retrofitted, according to a further aspect of the invention a monitoring device for an elevator car is proposed, which includes an evaluation device and at least one optical sensor for capturing image data, and preferably a communication device for communication with at least one server via a first communication network, the evaluation device being set up to carry out a method according to the invention.
/ 52
However, the aforementioned communication with a server is advantageous independently of the aforementioned check, for example to carry out a two-stage check whether an event detected should trigger an alarm procedure for the specific elevator car. In the following, such a method is briefly discussed, which can be easily combined with the method in question. The procedure described below is the subject of an independent registration, which was filed by the same applicant on the same filing date.
In order to enable a simple adaptation of the monitoring process to the area of use or the place of use of the elevator system, the method for monitoring the elevator car provides that the following steps are carried out in order to identify a safety-relevant event in the elevator car:
Evaluating the detected sensor data and identifying a current event in the elevator car using at least one algorithm stored in the evaluation device;
- generating an event identification message associated with the current event;
Comparing the event identification message with an event database assigned to the elevator car, the current event being identified as an event relevant to the elevator car if the event identification message and an entry in the event database match;
- Triggering an alarm procedure by the at least one server when a security-relevant event has been identified.
The simplification of the server structure is achieved on the one hand by evaluating the sensor data locally in the evaluation device and not centrally on the at least one server. The amount of data to be transmitted can thus be significantly reduced.
/ 52
The adaptability of the monitoring method to different places of use is achieved by a two-step process, whereby in a first step the algorithm of the evaluation device recognizes events from the sensor data that are potentially safety-relevant, regardless of which event is actually safety-relevant for the respective place of use of the elevator system and for which an alarm procedure has to be triggered. For example, such events can be one of those mentioned in the following non-exhaustive list: unconscious person, object left behind, fire, unusual behavior of a person, heavy soiling in the elevator car, no opening of the elevator door, failure of the elevator lighting, heavy soiling of the elevator car, Vandalism in the elevator car.
The sensor data that are transmitted to the evaluation device via the first data connection can comprise a single measured value of a sensor or can comprise several measured values that can be measured by a sensor. The same applies to two, three or more sensors. It is also conceivable for raw data, for example image data or audio data, to be transmitted to the evaluation device as sensor data, the evaluation device evaluating the raw data by means of an evaluation algorithm. The evaluation algorithm can, for example, provide a comparison of image data with at least one reference image or a comparison of audio data with an audio database.
At this point there is the interface to the method in question, since the comparison of the image data recorded by the at least one optical sensor with the at least one reference image and the other method steps according to the invention can be carried out as part of the evaluation algorithm. Correspondingly, the at least one sensor of the method defined above comprises the at least one optical sensor provided according to the invention and optionally further sensors.
/ 52
The evaluated sensor data can be fed to an identification algorithm by means of a so-called feature vector, which contains various entries for the sensed and possibly pre-evaluated sensor data, for example temperature, number of objects in the elevator car, smoke, the generation of a feature vector also being regarded as an evaluation , Different concepts come into question for the identification algorithm: For example, it can be a machine learning method, such as a neural network or a support vector machine, which continuously improves itself based on reference data without having to specify specific threshold values , On the other hand, a decision tree method is conceivable, which is machine-learning based on reference data. Instead, the
Identification algorithm can also be set up rule-based by means of a decision tree or a decision matrix, in order to recognize events also by reaching, exceeding or falling below concrete, predefined threshold values. A state machine-based identification algorithm is also conceivable, according to which a change in the evaluated sensor data identifies an event.
Using the identification algorithm, it is therefore possible, based on the sensor data acquired, to detect a current event in the elevator car and to identify which event has occurred. The identifiable events are preferably finally defined, but can be updated or expanded via the at least one server. Accordingly, an event identification message is generated, through which the information about the occurrence of the current event is forwarded to a next level.
At this level, it is checked whether the current event for the concrete, monitored elevator car actually represents a / 52 safety-relevant event, so that an alarm procedure has to be triggered or whether the current event does not require any specific measures for the location of the elevator car. For example, an item left behind in a security-sensitive environment, such as an airport, may require notification to the security service, while there is no need for it in a residential or office building.
For this purpose, an event database assigned to the monitored elevator car is provided, in which it is defined which actual event identified by the at least one algorithm actually represents a safety-relevant event for the specific elevator car and therefore the triggering of an alarm procedure is necessary. In other words, the entries in the event database act as a filter, which defines for each elevator car which current event triggers an alarm procedure. In the simplest case, an alarming procedure involves sending a message to a responsible reporting point, it also being conceivable to output information in the elevator car.
The term security-relevant events is to be understood in the context of those events which are intended to trigger an alarm procedure. Events such as heavy pollution or vandalism can also be involved. The term "event database" is not only to be understood as a database in the narrower sense, but rather it can be a list, a table or a data set which have corresponding entries which are compared with the event identification message allow at least one yes / no decision whether an alarm procedure should be triggered. The comparison can be a check, on the one hand, of whether the event database even has a corresponding entry for the event identification message, or, on the other hand, a check of whether an entry of event 21/52 assigned to the event identification message
Database the triggering of an alarm procedure is indicated. Accordingly, the generated event identification message is compared with the event database in order to ensure that the alarm procedure is only triggered if this is intended for the specific elevator car.
On the basis of the two-stage method, i.e. detection of a current event and checking whether the current event is a safety-relevant event for the elevator car, the same evaluation unit with the implemented at least one algorithm can be used in a large number of different areas of application or at different locations Elevator cabs are used without the at least one algorithm of the evaluation device having to be modified, since the security-relevant events which are dependent on the area of use or location and which are intended to trigger an alarm procedure can be defined in a simple manner in the event database.
In the context of monitoring hidden objects according to the invention, this means that the triggering of the alarm procedure provided according to the invention includes the steps according to the method described above. As a result of the definition of the event database, the triggering of the alarm procedure according to the invention can be interrupted as part of the comparison of the event identification message and the event database.
In principle, it is conceivable that the event database is also integrated into the evaluation device and that communication with the server only takes place when the alarm procedure is triggered.
In an embodiment variant of the method it is provided that the event identification message is transmitted from the evaluation device to the at least one server, the event database associated with the elevator car is stored on at least one server and the comparison of event identification message and event database on which at least one server is carried out. On the one hand, this reduces the volume of the transmitted data between the evaluation device and the at least one server, since only the event identification message is transmitted. On the other hand, the event database stored centrally on the at least one server is particularly user-friendly, since no direct access to the evaluation device is necessary. Nevertheless, an interface can be created in a simple manner between the provider of the system and the users of the system, which offers user-optimized access to the system in order to be able to adapt the triggering of an alarm procedure to the needs of the users.
Another embodiment variant provides that the event identification message contains the sensor data on which the identification of the current event is based. The function of the at least one algorithm of the evaluation device can be checked by the transmitted sensor data and, if necessary, the confidence intervals can be adapted for a specific elevator car. It is also conceivable that the transmitted sensor data are compared with corresponding data in the event database in order to decide whether an alarm procedure is triggered or not. It is particularly advantageous if the sensor data transmitted with the event identification message is stored on the at least one server in order to evaluate the sensor data, for example statistically, and to avoid future incorrect detections.
It is particularly advantageous to use the method for a number of elevator cars in one elevator system or for a number of elevator cars in different elevator systems. In this case, the at least one server functions as a central interface, via which the alarm procedures of various elevator cars can be processed centrally. Because the event database is stored on the at least one server, each evaluation device of an elevator car that communicates with the at least one server can be assigned its own event database. Likewise, it is also possible to assign a common event database to a group of elevator cars, which are all operated in the same area of application and therefore the same events are classified as safety-relevant. It goes without saying that a data construct can also contain several event databases for different elevator cars or for different groups. For example, a building complex may have a first group of elevator cars, for which objects left behind are safety-relevant (such as passenger lifts), and a second group of elevator cars, such as staff lifts, for which this event is irrelevant. It is therefore provided in a particularly preferred embodiment variant of the method that an event database is assigned to each elevator car and / or that several elevator cars are combined to form a group and an event database is assigned to each group of elevator cars.
While it is fundamentally conceivable to trigger and carry out the same alarm procedure for each detected safety-relevant event, for example the notification of a lifeguard, it is particularly advantageous if an alarm procedure coordinated with this is triggered for each safety-relevant event.
It is therefore provided in a further embodiment variant of the method that at least one alarm procedure is stored in the event database for each security-relevant event. It is also conceivable to define different processes within an alarm procedure that are processed with different priorities.
In order to ensure that security, emergency or emergency personnel / 52 can get to the location of the security-relevant event via the triggered alarm procedure, it is provided in a further preferred embodiment variant of the method that location data associated with the elevator car is stored on the at least one server and the Location data are transmitted as part of the triggered alarm procedure. The location data can be, for example, an address, GPS coordinates and / or a map of a building.
In order to be able to identify various events in a simple manner by means of the at least one further sensor, in a further embodiment variant of the method it is provided that the at least one sensor is a smoke sensor and / or a temperature sensor and / or an acoustic sensor, in particular a microphone , and / or an acceleration sensor and / or a moisture sensor and / or an ultrasonic sensor. The smoke sensor and the temperature sensor can be used, for example, for fire detection, the acoustic sensor can, for example, detect abnormal noises such as screams, while the penetration of liquid, for example, can be detected by means of the moisture sensor. Ultrasonic sensors can contribute to the detection of objects in precarious lighting conditions, for example.
In order to be able to contact people in the pull-out cabin as part of the alarm procedure, a further preferred embodiment of the method provides that the elevator cabin has a display unit and / or an audio transmission unit and the alarm procedure comprises at least one of the following steps:
- Establishing a video connection between the display unit and the at least one server or between the display unit and an emergency call center;
- Establishing an audio connection between the audio transmission unit and the at least one server or between the audio transmission unit and an emergency call center.
/ 52
It goes without saying that a connection to a maintenance center is also possible. It is also conceivable that communication with the emergency call center or the maintenance center takes place via the at least one server.
BRIEF DESCRIPTION OF THE FIGURES
The invention will now be explained in more detail using an exemplary embodiment. The drawings are exemplary and are intended to illustrate the inventive concept, but in no way to narrow it down or even reproduce it conclusively.
It shows:
Figure 1 is a schematic representation of an elevator car with a monitoring device.
2 shows an embodiment of a system with a plurality of monitoring devices;
3 shows a schematic overview of a flow chart, in particular section II;
FIG. 3a section I of the flow diagram according to FIG. 3;
3b section III of the flowchart according to FIG. 3.
WAYS OF CARRYING OUT THE INVENTION
1 shows an elevator car 3 of an elevator installation, which is located in an elevator shaft. The vertical movement of the elevator car 3 takes place by means of a support cable 10 connected to a drive unit, which cooperates with a counterweight 11. The elevator car 3 is closed by means of an elevator door 5, which can open on at least two floors in order to enable the entry and exit of objects, in particular people and objects.
In the interior of the elevator car 3, a monitoring device 4 is attached, which comprises an optical sensor 9, by means of which the elevator car 3 can be monitored.
/ 52
2 shows a system with two monitoring devices 4, which are in communication connection with two servers 1 via a communication network 2. Each of the monitoring devices 4 is arranged in a different elevator car 3. The communication network 2 can also be represented by one or more of the following known network solutions: Internet, mobile radio network, a hub, switch, router, WLAN router, CAN controller or mobile solutions such as GSM, GPRS, EDGE, UMTS, HSPA, LTE, WiMAX, LTE-Advanced or a 5G connection or other network solutions.
In the present exemplary embodiment, the monitoring device 4 comprises the optical sensor 9 for acquiring image data and a further optional sensor 8, which acquires sensor data. The further sensor 8 can be, for example, a smoke sensor and / or a temperature sensor and / or an acoustic sensor, in particular a microphone, and / or an acceleration sensor and / or a moisture sensor and / or an ultrasonic sensor. Depending on which event is to be detected in the elevator car 3, a single sensor 8.9 or a combination of two or more sensors 8.9 can be advantageous.
The sensors 8, 9 are connected via a first data connection to an evaluation device 6, in which the sensor data are evaluated. In particular, the image data of the optical sensor 9 are compared with at least one reference image, as will be explained in detail below. The first data connection can be, for example, a serial interface, such as USB, RS232 or RS485, or a parallel interface, such as PCI or IEEE 1284. A CAN bus as a data connection is also conceivable.
The evaluation device 6 can be, for example, a microcomputer or an (industrial) PC which can receive image data on the one hand and / 52 on the other hand
Activate, save and deactivate data objects and their associated entries. In addition to this, the evaluation device 6 generally has at least one algorithm which continuously detects and checks the recognition features of the detected objects. In addition, the evaluation device 6 can advantageously transmit data and information to the server 1 (or the servers 1) via the communication network and receive information and data from the server 1. Alternatively, an independent communication device can also be provided.
In addition, the monitoring unit 4 has a display device 7, via which information can be displayed. Likewise, it is also conceivable for video transmission to be established by means of the optical sensor 9 and the display device 7. The display device 7 is electronically controllable and can e.g. an LCD, plasma, FED, TFT, CRT, OLED, SED, falling sheet display, Nixie tube, Braun tube, matrix display (LED, OLED, VFD, incandescent lamp), video projector (Eidophor, tubes, LCD, DLP, LED, LCoS, laser ), but is not limited to these statements.
In order to establish an audio connection, an audio transmission device (not shown) can also be integrated in the monitoring device 4, which includes a microphone and a loudspeaker. If one of the sensors 8 is designed as a microphone, this can be used for the audio connection.
The method according to the invention for monitoring the elevator car 3 will now be explained on the basis of one of the monitoring devices 4. Although the compact and modular structure of the monitoring device 4 is advantageous, it is not absolutely necessary for the functioning of the method to install all functionally essential elements in one unit. Rather, the sensors 8, 9 and the evaluation device 6 and, if appropriate, the display device 7 and / 52
Audio transmission device can be installed separately from each other in the elevator car 3.
FIGS. 3, 3a and 3b show a schematic flow diagram of a preferred embodiment variant of the method according to the invention, which has been divided into three sections for the sake of clarity. 3 shows the interrelationships of sections I, II and III, as well as the processes of section II in detail.
The first phase of the monitoring process is represented by section I shown in FIG. 3a, which is carried out each time the monitoring is started. The optical sensor 9 continuously records image data of the monitoring area of the interior of the elevator car 3. The image data are compared in the evaluation device 6 to record the access of objects, such as people or objects, to at least one reference image. For this purpose, it is necessary to load the at least one reference image into the evaluation device 6. In the present example, at least one reference image with the elevator door 5 closed and at least one reference image with the elevator door 5 open is loaded. In this way, on the one hand, the evaluation device 6 can detect whether the elevator door 5 is open by comparing the image data with the reference images, so that an entry or exit of objects can be expected or is closed. The more reference images are used for comparison, the higher the probability of being able to correctly capture an object. The reference images can be acquired, for example, in the course of one or more calibration runs by the at least one optical sensor 9, wherein a reference image with the elevator door 5 open is preferably acquired on each floor. Several calibration runs can further increase the accuracy if reference images with appropriate lighting conditions are taken at different times of the day. Alternatively, it is also conceivable that the at least one / 52
Reference image is imported from a database, for example from server 1.
As soon as the at least one reference image is loaded, the monitoring starts, the image data recorded by the at least one optical sensor 9 being continuously compared in the evaluation device 6 with the at least one reference image, and the processes shown in section II are carried out in parallel: and exits, "position tracking," monitoring a predefined time period and "movement tracking person, as can be seen in FIG. 3. As will be explained in the following, the method is an advantageous combination of processes, although not all processes are actually necessary to carry out the method according to the invention.
Of particular importance is the detection of accesses to objects in the surveillance area and the detection of objects that leave the surveillance area. As already mentioned at the beginning, entrances and exits generally take place when the elevator door 5 is open. Such an access can be called regular access. However, it is also conceivable for an unknown object to be recognized at a later time, for example while driving or on another floor. This is particularly the case if the object was covered by another object when crossing the elevator door 5 and was therefore not detected by the at least one optical sensor 9. In this case one can speak of a hidden entrance.
Simultaneously with the detection of a new object, irrespective of whether regular or concealed access has taken place, on the one hand a data object is activated and at least one recognition feature of the object is detected by the evaluation device 6 and stored in the data object in a data memory for the purpose of data acquisition. The at least one recognition feature is used to identify an object among a plurality of objects in the monitoring area, / 52 wherein the at least one recognition feature is preferably updated continuously as long as the object is in the monitoring area and is detected.
In order to determine whether a detected object is a person or an object, face recognition is carried out in the evaluation device 6 and a corresponding identification entry is activated in the data object. Likewise, the identification entry can also receive information relating to a classification of the object, for example a man, woman, child or a certain class of objects, for example items of luggage.
With the help of the image comparison and the processes described below, each object is monitored over its entire length of stay in the monitoring area. If the evaluation device 6 detects that an object leaves the monitoring area, ie if it determines the departure of the object, the data object assigned to this object is deactivated. A deactivated - that is to say inactive - data object in the data memory means that the assigned object is no longer located in the elevator car 3. Deactivation can also be understood to mean the deletion of the data object.
The second process that runs in parallel is position tracking, i.e. the acquisition and storage of position data of the individual objects in the respective data objects. For this purpose, in addition to a conventional image sensor, for example a digital video camera, the at least one optical sensor also includes a depth camera, which can record spatial position data. With the depth camera, which includes, for example, an infrared laser projector and a monochromatic CMOS sensor, a three-dimensional image of the monitoring area can be created in which the objects are positioned three-dimensionally.
/ 52
If an object changes its position, one of three cases can occur: In the first case, the detection of the object is not affected by the change in position, so that only the position data is updated. In the second case, an object is no longer detected by the at least one optical sensor 9, but without the departure of the object from the monitoring area having been detected. In other words, the object is covered by a second object. For this reason, a hide entry is activated in the data object of the hidden object. In the third case, an object is recaptured that was previously hidden. Accordingly, the concealment entry is deactivated again after recognition.
Although the combination of position tracking and concealment detection has a positive influence and is more secure due to the comparison with other objects, it is not absolutely necessary to record the position data in order to activate or deactivate a concealment entry. For example, it is conceivable that the at least one optical sensor 9 can no longer find the at least one recognition feature of an object and therefore activates the concealment entry. As soon as the objects change their position again, the at least one recognition feature is recorded again and therefore the concealment entry of the recaptured object is deactivated.
In order to prevent data objects with an active masking entry from remaining active for any length of time, even if the corresponding object may have already left the monitoring area without this being detected, a maximum duration is defined for each data object, for example 30 minutes, after which the object monitoring ends and the corresponding data object is deactivated. Additionally or alternatively, all active data objects can be deactivated if an empty monitoring area is detected.
/ 52
A positive effect of the detection and marking of hidden objects can of course be seen in the higher stability of the surveillance for a plurality of objects within the surveillance area.
As shown in section III shown in FIG. 3b, the detection and identification of hidden objects by means of the hidden entry also enables the targeted triggering of an alarm procedure, as will be explained in the following. In order to determine whether an object has been left in the elevator car or whether a person can no longer leave the elevator car for health reasons, for example due to fainting, the length of time since the detection of an object is recorded. If this time period exceeds a predefined time period, the alarm procedure is triggered in order to alert security or emergency personnel. If only the time were recorded alone, false alarms would often be triggered, since hidden objects which had left the surveillance area covered would trigger the alarm procedure each time the predefined time period had elapsed.
In order to overcome this disadvantage, in addition to the expiry of the predefined period of time, two further conditions must be met in order to trigger an alarm procedure: on the one hand, the data object must be active, it must not be deactivated due to one of the previously explained processes, and on the other hand, the data object must not active cover entry. In this way it can be ensured that an alarm procedure is only triggered when the object in question is actually still in the elevator car 3. A concealment entry that is active for a certain period of time does no harm to the process, because even if the concealment entry is only deactivated after the predefined period of time has elapsed, the alarm procedure is triggered immediately. Depending on whether the object is a person or an object, different alarm procedures can be triggered / 52 and / or predefined time periods of different lengths can be provided.
The predefined time period can either be fixed, for example 5 minutes. However, it is advantageous if the predefined time period is adapted to the ambient conditions at the place of use of the elevator car 3, for example corresponds to the time period that the elevator car 3 takes for a journey from a lowest to a top floor and back. It is also advantageous to add a surcharge value to take into account the stays on one, several or all floors. If the evaluation device 6 detects directly or indirectly on which floor the elevator car 3 is located, the time period can be shortened, for example until the second reversal of direction after the detection of the object.
In order to optimize the various processes, a feedback loop is provided after the end of the alarm procedure, whereby either an error case is reported if there is actually no emergency, or a success case is reported if an emergency actually exists. The parameters underlying the triggering of the alarm procedure can be used to improve the method in order to avoid future incorrect detections and to increase the probability of similar success cases.
Another optional way to detect an emergency can be created by monitoring a person's movements. In this way, the alarm procedure can also be triggered before the predefined period of time has elapsed if the person is not standing for a longer period or is no longer moving. When detecting the movement, the fact can be exploited that a person who is consciously makes involuntary small movements that are detectable. If these small movements are missing, an unconscious person can be assumed.
/ 52
Finally, the predefined period of time can also be interrupted on the basis of other detected events, for example when a person is in the monitoring area and the lighting of the elevator car 3 changes or when the elevator door 5 is over a long time
Period cannot be opened even though there is one person in elevator car 3.
/ 52
LIST OF REFERENCE NUMBERS
server
Communication network
car
monitoring device
elevator door
evaluation
display
Sensor optical sensor
supporting cable
Counterweight / 52

权利要求:
Claims (15)
[1]
1. Method for monitoring an elevator car (3) by means of at least one optical sensor (9), wherein the at least one optical sensor (9) captures image data in a monitoring area of the elevator car (3), the captured image data being transmitted to an in via a first data connection evaluation device (6) arranged in the elevator car (3) are transmitted, the recorded image data being compared in the evaluation device (6) with at least one reference image of the monitoring area in order to carry out the following steps:
- Detecting the access of objects to the monitoring area and at least one recognition feature for each detected object, wherein a data object is activated in a data memory for each detected object and the at least one recognition feature is stored in the data object;
- Detecting the departure of objects from the surveillance area, the data object assigned to the departed object being deactivated;
in which
- a concealment entry is activated in the data object of an object when the object is no longer detected by the at least one optical sensor (9) without the departure of the object having been detected;
- The concealment entry in the data object of an object is deactivated when the object is detected again by the at least one optical sensor (9);
an alarm procedure is triggered if
37/52
a data object was not deactivated in a predefined period of time after its activation and the data object has no active concealment entry.
[2]
2. The method according to claim 1, characterized in that the following step is carried out in the evaluation device (6):
- Identify whether a detected object is an object or a person, a corresponding identification entry being activated in the data object.
[3]
3. The method according to claim 2, characterized in that after the identification of an object and / or a person, a classification into different object classes or person classes takes place, the classification being stored in the identification entry.
[4]
4. The method according to claim 2 or 3, characterized in that different alarm procedures are triggered depending on the identification entry and / or that the predefined time period is defined differently for each identification entry.
[5]
5. The method according to any one of claims 2 to 4, characterized in that the predefined time period is interrupted and the alarm procedure is triggered if, in addition to the detection of the presence of at least one person without an active cover entry, one of the following operating situations is detected:
- Changing the lighting conditions in the monitoring area when the elevator door (5) of the elevator car (3) is closed;
38/52
- No opening of the elevator door (5) of the elevator car (3) over a predefined maximum duration.
[6]
6. The method according to any one of claims 1 to 5, characterized in that the at least one optical sensor (9) comprises a depth camera and the following step is carried out in the evaluation device (6):
- Detection of position data of the detected objects for determining a position of the objects within the monitoring area, at least the current position data being stored in the data object;
the position data being used to verify the activation and / or deactivation of the concealment entries.
[7]
7. The method according to any one of claims 1 to 6, characterized in that at least two reference images are provided, at least one first reference image showing the monitoring area when the elevator door (5) of the elevator car (3) is open and at least one second reference image showing the monitoring area when the elevator door is closed ( 5) shows the elevator car (3).
[8]
8. The method according to any one of claims 1 to 7, characterized in that the evaluation device (6) detects directly or indirectly whether an elevator door (5) of the elevator car (3) is open or closed, with detection of the departure of objects only then takes place when the elevator door (5) of the elevator car (3) is open.
[9]
9. The method according to any one of claims 1 to 8, characterized in that the at least one reference image in the context of at least one calibration run of the elevator car (3) of the at least one optical
39/52
[10]
10th
[11]
11th
[12]
12th
[13]
13th
Sensor (9) is detected and / or that the at least one reference image is imported from a database.
Method according to one of claims 1 to 9, characterized in that the predefined time period corresponds to the time which the elevator car (3) needs for a journey from a lowest to a top floor, preferably plus an additional value for a stay of the elevator car (3 ) on one or more floors.
Method according to one of claims 1 to 9, characterized in that the evaluation device (6) detects directly or indirectly on which floor the elevator car (3) is located and the predefined time period corresponds to the time between the creation of the data object and the second reversal of direction the elevator car (3) passes or the predefined period of time corresponds to the time that elapses between the creation of the data object and the passage of the elevator car (3) on the floor in which the data object was created.
Method according to one of claims 1 to 11, characterized in that at the end of the alarming procedure it is checked whether an event justifying the triggering of the alarming procedure has taken place, parameter values on which the triggering of the alarming procedure is based are stored together with the check result in order to save future ones To avoid false detections.
Method according to one of claims 1 to 12, characterized in that all data objects are deactivated if no object is detected in the monitoring area and / or that a data object with active concealment entry is deactivated after a predefined maximum duration.
40/52
[14]
14. The method according to any one of claims 1 to 13, characterized in that, based on the at least one reference image, the monitoring area depending on an interior and / or a pre-area of the
5 elevator car is set.
[15]
15. Monitoring device (4) for an elevator car (3) with an evaluation device (6) and at least one optical sensor (8, 9) for recording image data, and preferably a communication device for
10 communication with at least one server (1) via a first communication network (2), characterized in that the evaluation device (6) is set up to carry out a method according to one of claims 1 to 14.
41/52
1.5
Fig. 1
42/52
2.5
Fig. 2
43/52
3.5
Paralle.
Fig. 3
44/52
4.5
Fig. 3a
45/52
5.5
46/52 Austrian
Patent Office

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引用文献:

公开号 | 申请日 | 公开日 | 申请人 | 专利标题

JP2015120573A|2013-12-24|2015-07-02|株式会社日立製作所|Elevator with image recognition function|

JP2000026037A|1998-07-13|2000-01-25|Hitachi Building Systems Co Ltd|Crime preventing device for elevator|

JP2003112878A|2001-10-09|2003-04-18|Hitachi Building Systems Co Ltd|Device for recording image in elevator car|

JP5977932B2|2011-09-08|2016-08-24|東日本旅客鉄道株式会社|In-car state monitoring device, in-car state monitoring method and program|AT523031A1|2019-10-14|2021-04-15|View Promotion Gmbh|METHOD OF MONITORING AN ELEVATOR CAB|

法律状态:

优先权:

申请号 | 申请日 | 专利标题

ATA50878/2017A|AT520567B1|2017-10-17|2017-10-17|Method for monitoring an elevator car|ATA50878/2017A| AT520567B1|2017-10-17|2017-10-17|Method for monitoring an elevator car|

EP18795951.5A| EP3697712A1|2017-10-17|2018-10-16|Method for monitoring a lift car|

PCT/EP2018/078279| WO2019076917A1|2017-10-17|2018-10-16|Method for monitoring a lift car|

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