• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention provides an image data illegal use prevention system which can prevent illegal use of digital image data without deterioration in image quality. The system for preventing illegal use of image data includes image data fetch means for fetching digital image data into which electronic watermark data is inserted, and electronic watermark data detection for detecting digital watermark data from image data fetched by the image data fetch means. Means. If the digital watermark data is detected by the digital watermark data detecting means, the image data recording means prevents unauthorized copying by not recording the image data fetched by the image data fetch means on the recording medium. The digital watermark data is calculated, for example, according to a predetermined formula for the frequency component of the discrete cosine transformed digital image data.
    公开号:KR19980070578A
    申请号:KR1019980001288
    申请日:1998-01-17
    公开日:1998-10-26
    发明作者:이소노토시유키；사토시노부
    申请人:가네코히사시；닛폰덴키(주)；
    IPC主号:
    专利说明:

    Image data fraud prevention system
    The present invention relates to the field of digital image processing, and more particularly, to a system for preventing the illegal use of digital image data.
    In recent years, illegal copying of digital images has become a problem.
    In order to prevent unauthorized copying, a system has been proposed in which only a reproduction system that encrypts digital image data and has a legitimate decryption key can reproduce encrypted digital image data. However, once decrypted, it cannot be prevented from further duplication.
    Therefore, a unique identification code is recorded on the recording medium, and a different identification code is recorded for each decoder in a method for indicating permission or prohibition of copying (see Japanese Patent Application Laid-Open No. 8-69419) or a decoder for pay-TV broadcasting. In other words, a method in which only a decoder having a contracted identification code can be decoded accurately (see Japanese Patent Laid-Open No. 5-260468) is proposed.
    Moreover, in order to prevent the illegal use and duplication of a digital image, the method of inserting special information, ie, electronic watermark data, into the digital image itself is also proposed. As such digital watermark data for digital images, two types of visible digital watermark data and invisible digital watermark data are used.
    Visible electronic watermark data is to synthesize a special character or symbol for the image so that it can be visually sensed, resulting in deterioration of image quality, but visually appealing to the user of the digital image to prevent illegal use. There is.
    An example of embedding visible digital watermark data is shown in Japanese Patent Laid-Open No. 8-241403. In this method, when synthesizing the visible electronic watermark data with respect to the original image, only the luminance of the pixel corresponding to the opaque portion of the electronic watermark data is changed, and the color component of the pixel is not changed. The digital watermark data is then synthesized into the original image. At this time, the scale factor for changing the luminance component of the pixel is determined by the color component, random numbers, the value of the pixel of the digital watermark data, and the like.
    In addition, the invisible digital watermark data is such that the digital watermark data is inserted into the image so as not to deteriorate the image quality. Therefore, the invisible digital watermark data cannot be visually detected because there is almost no degradation in the image quality.
    However, by inserting special information that can identify the author as the electronic watermark data, it is possible to specify the author by detecting the electronic watermark data even after an illegal copy is made. Also, when non-replicable information is inserted, for example, when the reproduction apparatus detects the non-replicable information, the user is notified that copying of data is prohibited, or the copy protection mechanism in the reproduction apparatus is operated to operate the VTR (video tape recorder). It is possible to limit the duplication of data by the "
    As a method of embedding invisible digital watermark data into a digital image, there is a method of inserting special information as digital watermark data in a portion where image quality such as LSB (least significant bit) of pixel data is less affected. That is, this method can be said to be the method of inserting digital watermark data in the time waveform of an image signal. However, when applying this method, it is easy to remove digital watermark data from an image. For example, if a low pass filter is used, the LSB information of the pixel is lost. In addition, since the image compression process reduces the amount of data by lowering the amount of information of the portion where the influence of the image quality is small, the digital watermark data is lost by the image processing. Therefore, the above-described method has a disadvantage in that it is difficult to redetect digital watermark data.
    Therefore, a method of frequency converting an image and inserting electronic watermark data into a frequency spectrum has been proposed (Nikkei Electronics, April 22, 1996, No.660, page 13). In this method, since the digital watermark data is inserted into the frequency component, the digital watermark data is not lost by image processing such as compression processing or filter processing. In addition, by employing random numbers according to a normal distribution as the digital watermark data, it is difficult to prevent the interference between the electronic watermark data and to destroy the digital watermark data without significantly affecting the entire image.
    In the method of inserting the digital watermark data, the original image D is divided into 8 (pixcel) x 8 (pixcel) blocks, and the digital watermark data is inserted using this block as a processing unit. Extraction processing of digital watermark data is also performed in units of blocks.
    The process of inserting the digital watermark data is, first, f (1), in order from the lowest frequency component of the AC component in the frequency domain after the discrete cosine transform (DCT) of the MPEG (Moving Picture Experts Group) encoding process. Using f (2), ..., f (n), digital watermark data w (1), w (2), ..., w (n) is selected from a normal distribution with mean 0 and variance 1 ,
    F (i) = f (i) + α * avg (f (i)) * w (i)
    Is calculated for each i. Here, α is a scale factor, and avg (f (i)) is a partial mean that is an average of absolute values of three points in the vicinity of f (i). Then, instead of f (i), F (i) is used to perform subsequent processing of the MPEG encoding process.
    The digital watermark data is detected according to the following method. In this detection method, the original image is not necessary, and the digital watermark data candidate w (i) (where i = 1, 2, ..., n) may be known.
    In the frequency domain of each block after the dequantization of the MPEG decompression processing is completed, data are represented by F (1), F (2), ..., F (n) in order from the low frequency component. The average value of the absolute values of three points near each F (i) is the partial mean avg (F (i)), and the digital watermark data W (i) is W (i) = F (i) / avg (F (i). ), And the total WF (i) of W (i) for one image is calculated for each i.
    Next, the statistical similarity between w (i) and WF (i) is calculated using the dot product of the vector,
    C = WF * w / (WFD * wD)
    Calculate by Where W = (WF (1), WF (2), ..., WF (n)), w = (w (1), w (2), ..., w (n)), WFD = Absolute value of the vector WF, wD = absolute value of the vector w. If the statistical similarity C is equal to or greater than a specific value, it is determined that the corresponding digital watermark data is inserted.
    However, in such a method, when image data is regarded as a single piece of digital data on a personal computer, it can be copied over and over again using a copy command of software of an operating system such as Windows or MS-DOS.
    In addition, since a digital video recorder, a system for handling digital images such as a copier or a facsimile simply generates a copy of the data, it is not possible to prevent the digital image data including the electronic data from being copied as it is.
    BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing the basic configuration of a system for preventing illegal use of image data according to the present invention.
    FIG. 2 is a block diagram showing a configuration example of the watermark data insertion means shown in FIG.
    3 is a block diagram showing an example of the configuration of the watermark data detection means shown in FIG.
    Fig. 4 is a block diagram applying the image data fraud prevention system of Fig. 1 to a digital video system.
    FIG. 5 is a block diagram applying the image data fraud prevention system of FIG. 1 to a digital copy system; FIG.
    Figure 6 is a block diagram of an embodiment in which the image generation recording apparatus of Figure 1 is formed by a printer system.
    7 is a block diagram of an embodiment in which the image duplication apparatus of FIG. 1 is formed by a facsimile system;
    Fig. 8 is a block diagram of an embodiment in which the image duplication apparatus of Fig. 1 is formed as a capture board system.
    Fig. 9 is a block diagram of an embodiment in which the image data illegal use prevention system according to the present invention is applied to a data transmission system.
    10 is a flowchart for explaining the operation of the data transmission system of FIG.
    FIG. 11 is a block diagram showing a configuration example of the watermark data detection / insertion means shown in FIG.
    * Description of the symbols for the main parts of the drawings *
    1: image data generating means 2: watermark data inserting means
    3: watermark data table 4: image data recording means
    5: recording medium 6: image data fetch means
    7 image data recording means 8 watermark data detection means
    An object of the present invention is to provide a system in which illegal use of digital image data can be prevented without deterioration in image quality and, for example, even when copied, whose ownership can be identified from the copy.
    In order to achieve the above object, according to a first aspect of the present invention, there is provided a system for preventing illegal use of image data, comprising: image data fetch means for fetching digital image data into which digital watermark data has been inserted; Digital watermark data detecting means for detecting digital watermark data from image data fetched by image data fetching means, and when digital watermark data is detected by the digital watermark data detecting means, fetching by image data fetching means And a transmission prohibiting means for prohibiting the transferred image data from being transmitted to the transmission line.
    According to the second aspect of the present invention, a system for preventing illegal use of image data includes: data fetch means for fetching digital image data into which digital watermark data is inserted, and water from image data fetched by the image data fetch means. Digital watermark data detecting means for detecting mark data, and transmission of data different from the image data fetched by the image data fetching means to the transmission line when the electronic watermark data is detected by the digital watermark data detecting means. It is characterized by having a means. In the above case, the other data is preferably data in which data obtained by multiplying the digital watermark data is superimposed on the image data fetched by the image data fetch means.
    According to a third aspect of the present invention, a system for preventing illegal use of image data includes image data fetch means for fetching digital image data into which digital watermark data is inserted, and from image data fetched by this image data fetch means. When the digital watermark data detection means for detecting the digital watermark data and the detected digital watermark data indicate whether the transmission value or the transmission is impossible, and the detected watermark data indicate that the transmission is impossible, And transmission prohibition means for prohibiting the fetched image data from being transmitted to the transmission line. In the above case, the transmission prohibition means determines that the detected digital watermark data is electronic watermark data indicating non-transmission when the detected digital watermark data includes a value indicating the number of transmission possible.
    According to a fourth aspect of the present invention, there is provided a system for preventing illegal use of image data, comprising: image data fetch means for fetching digital image data into which electronic watermark data including a value indicating the number of transfers m is inserted and fetched Watermark data inserting means for inserting new digital watermark data including a value indicating the number of times that the number of transfers can be made by one less than m, and the image data into which the new digital watermark data is inserted are inserted into the image data. And a transmission means for transmitting.
    In the image data illegal use prevention systems, the digital watermark data may be calculated according to a predetermined formula using frequency components of the discrete cosine-converted digital image data. Further, in any form of image data fraud prevention system, when the image data fetch means fetches the digital image data from the recording medium on which the digital image data is recorded, the transmission line is recorded separately from the recording medium on which the digital image data is recorded. It can be configured to be a medium.
    In the present invention, "transfer" means that the digital image data is transmitted to another medium from the original generation or storage source in which the digital image data is generated or stored, or stores such digital image data in another medium. Or storing the data on the other recording medium from the original storage recording medium, copying a file by a computer, or the like, and broadly meaning the operation of making the digital image data available.
    In the above-described image data illegal use prevention system, copying of image data can be prevented without deterioration in image quality by using an electronic watermark technique. Therefore, the image data fraud prevention system can be applied to various image processing methods.
    In addition, illegal copying can be prevented even if data is negatively copied irrespective of the original data medium and the medium to be copied, and by inserting copyright data as original watermark data into the original data, the watermark data is examined. The owner of the image data can be identified and the person who has made the illegal copy can be identified.
    EMBODIMENT OF THE INVENTION Next, embodiment of this invention is described in detail with reference to drawings.
    Fig. 1 shows the basic configuration of a system for preventing illegal use of image data to which the present invention is applied. This system includes two main components, the image generating and recording apparatus 100 and the image duplication apparatus 101. The image generation recording apparatus 100 is constituted by image data generating means 1, watermark data inserting means 2, watermark data table 3, and image recording means 4. In addition, the image duplication apparatus 101 includes an image data fetch means 5, an image data recording means 7, and a watermark data detection means 8.
    In the image generating and recording apparatus 100, the digital image data generated by the image data generating means 1 is transmitted to the watermark data inserting means 2. As shown in FIG. The watermark data insertion means 2 inserts the digital watermark data of the watermark data table 3 into the digital image data as described later. The image data recording means 4 records the digital image data in which the digital watermark data is inserted into the recording medium 5.
    In the image duplication apparatus 101, the image data fetching means 6 fetches digital image data recorded on the recording medium 5. The watermark data detecting means 8 detects digital watermark data in the digital image data fetched by the image data fetching means 6 as described later. The image data recording means 7 makes a copy by recording the digital image data on the recording medium 9 if the image data fetch means 6 does not detect the electronic watermark data, and if the electronic watermark data is detected, the recording medium. Digital image data is not recorded in (9).
    2 shows an example of the configuration of the watermark data insertion means 2. The digital image data from the image data generating means 1 of Fig. 1, that is, the discrete cosine transformed MPEG image data, is input to the partial average calculating section 111 and the adder 114. This digital image data is conveniently indicated by f (i) (i = 1.2, ..., n).
    The partial average calculation part 1ll is the part mentioned above by arg (f (i)) = (| f (i-1) | + | f (i) | + | f (i + 1) |) / 3 The average is calculated and the result is supplied to one input terminal of the multiplier 112.
    The digital watermark data w (i) is supplied from the watermark data table 3 to the other input terminal of the multiplier 112. The output of the multiplier 112 is multiplied by the scale factor α by the multiplier 113, and the result of the multiplication is added with the digital image data by the adder ll4. This addition result, i.e., image data f (i) + α * arg (f (i)) * w (i) into which the digital watermark data is inserted, is obtained from the adder 114, and the image data of FIG. It is supplied to the recording means 4.
    3 shows an example of the configuration of the watermark data detecting means 8. The data F (i) fetched by the image data fetching means 6 of FIG. 1 is supplied to the partial average calculation unit 115 and the divider 116. The partial average calculator 115 partially calculates avg (F (i)) described above. This calculation is performed by, for example, avg (F (i)) = (| F (i-1) | + | F (i) | + | F (i + 1) |) / 3. The divider 116 calculates W (i) = F (i) / avg (F (i)).
    Next, the adder 117 calculates the sum WF (i) of the calculated value W (i) for each I for each I. This WF (i) is supplied to the internal product calculating unit 118, and internal product calculation with the digital watermark data w (i) to be detected is performed. The operation of the internal product calculating section 118 appears as follows.
    C = WF * w / (WFD * wD)
    Here, WF is WF (1). A vector having WF (2), ..., WF (n) as elements, w is a vector having watermark data w (1), w (2), ..., w (n) as elements, WFD is the absolute value of the vector WF and wD is the absolute value of the vector w.
    The inner product calculation unit 118 calculates the inner product C for all the possible digital watermark data, and supplies the inner product C to the similarity determination unit 119.
    The similarity determination unit 119 detects the digital watermark data maximizing the dot product C, and sends the result to the image data recording means 7 of FIG.
    Fig. 4 shows an embodiment in which the image data fraud prevention system shown in Fig. 1 is applied to a digital video system. The image generating and recording apparatus 100 shown in Fig. 1 is formed as a video camera 100A, and the image duplication apparatus 100 is formed as a video recorder 110A.
    In the video camera 100A, the image photographed by the imaging unit 11 is transmitted to the watermark data insertion unit 12 as digital image data. In addition, since the digital watermark data to be inserted into the digital image data is stored in the watermark data table 13, the digital watermark data is read from the watermark data table 13, and the digital watermark data insertion unit ( 12) to send. The watermark data insertion section 12 inserts the digital watermark data into the digital image data that has been sent as described above. The digital image data into which the digital watermark data is inserted is stored in a recording medium 15 such as a magnetic tape or an optical disk by the recording unit 14.
    When making a duplicate, the digital image data stored in the recording medium 15 is reproduced by the reproducing section 16 of the video recorder 101A. Normally, this digital image data is again stored on the recording medium 19 by the recording unit 17 to make a copy. However, if the digital watermark data is inserted into the digital image data reproduced by the reproduction unit 16, that is, if the digital watermark data is detected by the watermark data detection unit 18, it notifies the recording unit 17 thereof. do. The recording unit 17 does not store the digital image data on the recording medium 19 when the detection of the digital watermark data is notified, thereby preventing unauthorized copying.
    Further, at the time of digital watermark data detection, the dummy data is supplied to the recording unit 17 or the watermark data stored in the watermark data detection unit 18 is integrally multiplied to the same as the dynamic range of the image data. Is added to the reconstructed image data and transmitted to the recording unit 17. When such data is supplied to the recording unit 917, since an image different from the original image is output from the recording unit 17, it is possible to prevent unauthorized copying even if the copying operation is not prohibited.
    FIG. 5 shows an embodiment of a digital copy system to which the image data illegal use prevention system shown in FIG. 1 is applied. The image generating and recording apparatus 100 in Fig. 1 is formed of the first copying machine 100B, and the image copying apparatus 01 is formed of the second copying machine 100B.
    The original image 20 fetched by the scanning unit 21 of the first copier 100B is transmitted to the watermark data insertion unit 22 as digital image data. Since the watermark data table 23 has digital watermark data to be inserted into the digital image data, it is sent to the watermark data insertion section 22. The watermark data insertion section 22 inserts digital watermark data into the digital image data that has been transmitted. The digital image data into which the digital watermark data is inserted is printed on the copy paper 25 by the printing unit 24.
    In the second copier 10LB, the image printed on the copy paper 25 is fetched by the scanning section 26, and restored to digital image data. Normally, this digital image data is reproduced by printing the copy paper 29 again by the printing unit 27, but if electronic watermark data is inserted into the digital image data fetched by the scanning unit 26, That is, when the digital watermark data is detected by the watermark data detection unit 28, the printing unit 27 notifies it. When the printing unit 27 is notified of the detection of the digital watermark data, the illegal copying is prevented by not printing the digital image data on the copy paper 29.
    Further, at the time of digital watermark data detection, dummy data is supplied to the printing unit 27, or watermark data stored in the watermark data detection unit 28 is multiplied to an extent equivalent to the dynamic range of the image data. The data is added to the reproduced image data and then sent to the printing unit 27. When such data is supplied to the printing unit, since the image completely different from the original image is output from the printing unit 27, unauthorized copying can be prevented even if the copying operation is not prohibited.
    6 shows a printer system 100C using a personal computer. The printing system 100C shown in FIG. 6 operates as the image generation recording apparatus 100 described above with reference to FIG. The watermark data table 33 stores digital watermark data to be inserted into digital image data. The watermark data insertion unit 32 inserts the electronic watermark data into the digital image data transmitted from the personal computer 31 and delivers the result to the printing unit 34. The printing unit 34 prints the digital image data into which the digital watermark data is inserted, on the printing sheet 35. Thus, even when attempting to copy digital image data using the copying machine 101B of FIG. 5, for example, digital watermark data is detected by the watermark data detection unit 28, thereby preventing unauthorized copying.
    FIG. 7 is an embodiment in which the image duplication apparatus 01 described above with reference to FIG. 1 is used as the facsimile system 101. As shown in FIG. When the modem 41 receives the image data transmitted via the telephone line, the image data is normally sent to the printing section 42 and printed on the facsimile paper 44. When the received image data is a digital image representing an image into which the electronic watermark data is inserted, such as an image printed by the printer system 100C of FIG. 6, the watermark data detection unit 43 uses the digital watermark data. Is checked to see if it is inserted. If the digital watermark data is detected, the printing unit 42 is notified of the detection. If the printing section 42 is notified that the digital watermark data has been detected, the printing unit does not perform a printing operation, thus preventing unauthorized duplication.
    Further, at the time of digital watermark data detection, the dummy data is supplied to the printing unit 42 or the watermark data stored in the watermark data detection unit 43 is integer-multiplied to the same as the dynamic range of the image data. Is added (overlapped) to the reproduced image data and sent to the printing unit 42. When such data is received by the printing section 42, since an image which is completely different from the original image is output from the printing section 42, it is possible to prevent unauthorized printing even if the printing operation is not prohibited.
    8 is an embodiment in which the image duplication apparatus 100 described above with reference to FIG. 1 is used as the capture board system 101D. The image data fetched by the image data fetching means 51 is normally transmitted to the capture device 52 and stored in the external storage device 54. When the image data is, for example, digital image data into which digital watermark data has been inserted, such as an image stored by the video camera 100A in FIG. 4, the digital watermark data detection apparatus 53 generates the digital watermark data. It is checked to see if it is inserted. If digital watermark data is detected, such detection is notified to the capture device 52. If the capture device 52 is notified that the digital watermark data has been detected, the storage device 52 does not perform a data storage operation and thus illegal copying is prevented.
    In the case of digital watermark data detection, dummy data may be supplied to the capture device 52, or watermark data stored in the watermark data detection unit 53 may be integrally multiplied to the same as the dynamic range of the image data. The data is added (overlapped) to the reproduced image data and transferred to the capture device 52. If such data is received at the capture device, since an image different from the original picture is output from the capture device 52, unauthorized storage can be prevented even if the storage operation is not prohibited.
    Fig. 9 shows an example in which the image data fraud prevention system according to the present invention is applied to a data transmission system for transferring and copying data from the storage means of the transfer source to the storage means of the transmission line. In Fig. 9, the input means 61 checks the presence or absence of the input command. When there is an input command, the copy command analyzing means 62 analyzes what is input. As a result of the analysis, when it is determined that a command to copy the transmission source data 69 of the storage medium 66 of the transmission source to the transmission line data area 70 of the storage medium 67 of the transmission line is entered, copy processing execution means An instruction is sent to 63 to execute copy processing. The copy processing execution means 63 transfers the transfer source data 69 stored in the storage means 66 of the transfer source to the temporary storage means 65, and then transfers the transferred data 69 to the watermark data. The detection / insertion means 64 is inspected. The watermark data detection / inserting means 64 detects the presence or absence of watermark data in the data 69, and when watermark data is detected, indicates whether the watermark data is allowed or prohibited to copy the watermark data. To judge.
    If the result of the detected watermark data permits copying, the transmission line data 69 stored in the temporary storage means 65 is copied to the transmission line data area 70 of the storage means 67. When the detected watermark data indicates that m copying is possible, dequantization data into which new watermark data is inserted from the watermark data detection / insertion means 64 is transmitted to the copy processing execution means 63, and the transmission line Is stored in the transmission line data area 70 of the storage medium 67 of the storage medium 67 and copying is performed. Next, information indicating what copying has been performed by the copy processing execution means 63 is sent to the display means 68 for display, and the copy processing ends. If the detected watermark data indicates that copying is impossible, copying is not performed.
    Next, the copy processing operation by the data transfer system of FIG. 9 will be described using the flowchart of FIG.
    The copy processing execution means 63 reads the transmission line data 69 from the storage medium 66 of the transfer source in step A1. In step A2, the transfer source data 69 is input to the copy command analyzing means 62, and the header of the MPEG data is analyzed to determine whether the data is MPEG image data or not.
    In the case where the transfer source data 69 is MPEG image data, the dequantization data is decoded by the variable length code in step A3, and the variable length coded data is dequantized in step A4. The dequantized data is supplied to the watermark data detecting / inserting means 64, whereby the watermark data is detected. In step A6, determination of the detected watermark data is made.
    If the watermark data detected in step A5 indicates that copying is impossible, the process jumps to step A13 without doing anything as is, thereby ending the process.
    If the watermark data detected in step A5 indicates that there is no limit on the number of copies, the process jumps to step A12 to copy the transfer source data 69 to the transmission line data area 70, and then jumps to step A13 to execute the process. Quit.
    If the watermark data detected in step A5 can be copied m (m = 1, ..., k) times, m is updated to m = m-1 in step A7. In step A8, mmarkable watermark data is inserted into the dequantized data in step A4.
    Next, when m≥O in step A9, the data into which the watermark data which can be copied m times is inserted in step A8 is quantized in step A10. The quantized data is variable length coded in step A11. The data which is variable length coded and converted into MPEG image data is input to the copy processing execution means 63 in step A12, and the copy processing is executed.
    In step A9, when m * O, copying is impossible and the process ends.
    Next, with reference to FIG. 11, the structural example of the watermark data detection / insertion means 64 is demonstrated. The watermark data detection / insertion means 64 is constituted by the digital watermark data insertion unit 64A and the digital watermark data detection unit 64B.
    The digital watermark data detection unit 64B has the same configuration as the watermark data detection unit 8 shown in FIG. 3, and the MPEG data F (i) decoded in step A3 of FIG. Supplied to multiplier 112. The partial average calculator 111 calculates avg (F (i)) described above. The divider 116 calculates W (i) = F (i) / avg (F (i)).
    Next, the adder 117 calculates the total sum WF (i) of the calculation value W (i) for each i. The total WF (i) is supplied to the internal product calculating section 118, and internal product calculation with the watermark data w (i) is performed.
    The inner product calculation unit 118 calculates the inner product C for all the watermark data that is likely, and supplies the calculated inner product C to the similarity determining unit 119.
    The similarity determination unit 119 detects the watermark data maximizing the dot product C, and transmits the result to the copy processing execution means 63 in FIG.
    The digital watermark data insertion unit 64A has the same configuration as the watermark data insertion unit 2 shown in Fig. 2, and the transfer source data from which the original watermark data has been removed in step A5 of Fig. 10 is a partial average calculation unit. (lll) and the adder 114 are input.
    The partial average calculation unit 111 calculates the above-described partial average and supplies the result of the calculation to one attraction terminal of the multiplier 112.
    The other input terminal of the multiplier 112 is supplied with watermark data w (i) representing the value of m determined in step A7 of FIG. The output of the multiplier 112 is multiplied by the scale factor α by the multiplier 113, and the result of the multiplication is added to the digital image data by the adder 114. As a result of this addition, that is, image data F (i) + α * arg (f (i)) * w (i) into which the new watermark data is inserted, is obtained in the adder 114, and the copy processing in Fig. 9 is performed. It is supplied to the execution means 63.
    As described above, the present invention can prevent duplication of image data without deterioration of image quality by using an electronic watermark technique, and can be applied to various image processing systems.
    In addition, since the medium of the data before copying and the copying medium to be copied are not limited, unauthorized copying can be prevented, and even if copied, the copyright data is inserted as the watermark data, and the watermark data is inspected so that the image can be copied. It is possible to identify the owner of the data, and to identify the person who has made the illegal copy.
    权利要求:
    Claims (8)
    [1" claim-type="Currently amended] In image data fraud prevention system,
    Image data fetch means for fetching digital image data into which digital watermark data is inserted;
    Digital watermark data detection means for detecting the digital watermark data from image data fetched by the image data fetch means;
    And a transmission prohibition means for prohibiting the transmission of the image data fetched by the image data fetch means to a transfer destination when the digital watermark data detection means is detected. Image data fraud prevention system.
    [2" claim-type="Currently amended] In image data fraud prevention system,
    Image data fetch means for fetching digital image data into which digital watermark data is inserted;
    Digital watermark data detection means for detecting the digital watermark data from image data fetched by the image data fetch means;
    And transmitting means for transmitting data different from the image data fetched by the image data fetching means to the transmission line when the digital watermark data is detected by the digital watermark data detecting means. Prevention system.
    [3" claim-type="Currently amended] 3. The image data illegal use prevention system according to claim 2, wherein the other data is data obtained by superimposing data obtained by multiplying the digital watermark data on image data fetched by image data fetching means.
    [4" claim-type="Currently amended] In image data fraud prevention system,
    Image data fetch means for fetching digital image data into which digital watermark data is inserted;
    Digital watermark data detection means for detecting the digital watermark data from image data fetched by the image data fetch means;
    It is determined whether the detected digital watermark data indicates whether the data can be transmitted or not. If the detected digital watermark data indicates that the data cannot be transmitted, the transfer operation of the fetched image data to the transmission line is prohibited. And an image transmission prevention means.
    [5" claim-type="Currently amended] The digital watermark according to claim 4, wherein the transmission prohibition means indicates that the detected digital watermark data cannot be transmitted when the detected number of digital watermark data is data including a value indicating zero. And image data fraud prevention system.
    [6" claim-type="Currently amended] In image data fraud prevention system,
    Image data fetch means for fetching digital image data into which digital watermark data containing a value indicating the number of transfers m is inserted;
    Watermark data inserting means for inserting new digital watermark data into the fetched image data, the value including a number indicating a number of times the number of transfers is less than m;
    And transmission means for transmitting the image data into which the new digital watermark data is inserted, to a transmission line.
    [7" claim-type="Currently amended] The image data illegal use prevention system according to claim 1, wherein the digital watermark data is calculated according to a predetermined formula using frequency components of the discrete cosine transformed digital image data.
    [8" claim-type="Currently amended] 2. The image data irregularity according to claim 1, wherein the image data fetching means fetches digital image data from a recording medium on which digital image data is recorded and the transmission line is a different recording medium from the recording medium on which the digital image data is recorded. Use prevention system.
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    同族专利:
    公开号 | 公开日
    EP0854633B1|2007-11-14|
    KR100267481B1|2000-10-16|
    DE69838692T2|2008-10-30|
    EP0854633A2|1998-07-22|
    EP1381217A1|2004-01-14|
    CA2226719A1|1998-07-17|
    CA2226719C|2001-09-11|
    SG78284A1|2001-02-20|
    DE69838692D1|2007-12-27|
    EP0854633A3|2000-01-05|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1997-01-17|Priority to JP97-005941
    1997-01-17|Priority to JP594197
    1997-02-17|Priority to JP3154597
    1997-02-17|Priority to JP97-031545
    1998-01-17|Application filed by 가네코히사시, 닛폰덴키(주)
    1998-10-26|Publication of KR19980070578A
    2000-10-16|Application granted
    2000-10-16|Publication of KR100267481B1
    优先权:
    申请号 | 申请日 | 专利标题
    JP97-005941|1997-01-17|
    JP594197|1997-01-17|
    JP3154597|1997-02-17|
    JP97-031545|1997-02-17|
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