• 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:
    In a color television receiver including a comb filter for separating luminance and chrominance components of a color television signal, a network is included for selectively restoring and enhancing vertical image detail to preserve and enhance vertical resolution in the luminance content of a displayed image. The comb filter provides a combed luminance signal output from which vertical detail signal information has been unavoidably deleted, and a combed chrominance signal output including signal frequency components representative of the deleted signal, which are selectively extracted from the combed chrominance signal. Low level detail signals are restored to the combed luminance signal via a first signal processing network with a prescribed restoration gain. The detail signal is also combined with the combed luminance signal via a second signal processing network which cores (removes) low level detail signals including noise, and enhances higher level detail signals through amplification to enhance vertical image definition. A resultant reconstituted luminance component manifests restored low level vertical detail information as well as enhanced higher level vertical detail information, without enhancing unwanted signal components such as noise.
    公开号:SU1082344A3
    申请号:SU802921951
    申请日:1980-05-08
    公开日:1984-03-23
    发明作者:Адамсон Лейгони Вильям；Селиг Фарер Джек
    申请人:Рка Корпорейшн (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to television, in particular, to devices for processing a vertical detail signal with a vertical aperture corrector of a television (TV) image in a color television (TV) receiver, including a comb filter or similar device for separating components of luminance and color of a TV signal without amplifying interfering signals, for example noise. The aperture corrector of a color television receiver, containing a comb filter, whose input is connected to a full color television signal source, is known; one output is connected directly to the corresponding inputs of a color kinescope unit and the other output through a video signal amplifier to a different color kinescope unit. The filtered luminance signal appearing at the input of the comb filter is filtered over its entire range and eliminates the components of the chrominance signal pj. However, the propagation of this filtering effect on the low-frequency part of the luminance signal, where there are no components of the chrominance signal, only leads to an undesirable exclusion of the components of the luminance signal, which carry information about vertical activity in the luminance signal. (Cymo to avoid loss of vertical resolution in the luminance component of the displayed TV image. Also known is an aperture equalizer containing serially connected sources of a full color television signal, a comb filter, a color block and a matrix unit, three outputs of which are connected to the corresponding inputs of the color kinescope block; at the same time, the second output of the comb filter is connected through the lower filter connected in series through the first filter from, the first adder and video amplifier of the luminance signal with the fourth input of the matrix unit z. Sometimes it is desirable to amplify information from the vertical detail of the displayed TV image by adding to the luminance signal a signal of vertical activity greater than that required to restore the luminance signal to its original shape, t Equal amplitude frequency response. The additional signal of the vertical part then serves to increase the resolution of the TV image in the vertical direction. However, for low-level luminance signals, such amplification creates undesirable visible effects, determined by the influence of noise, which are involuntarily amplified along with information about the vertical activity of the luminance signal. In addition, at this time, noise such as line widths is also undesirably amplified if they are present in the video signal. Interference of different lines is a form of low-level signal interference consisting in measuring the black level in a TV signal in adjacent rows of odd and even fields of a TV frame, and can be caused, for example, by misalignment of the station's signal processing systems. Interference of this type, in particular, is noticeable in a low-level TV signal having an amplitude of about five percent of the maximum expected, and causes unwanted visual effects on the reproduced image, which increases dramatically with vertical aperture correction. The purpose of the invention is to increase the degree of vertical aperture correction. The goal is achieved in that an aperture corrector of a color TV receiver containing a source of a full color television signal, a comb filter, a color block and a matrix unit, whose three outputs are connected to the corresponding inputs of the color kinescope unit, are connected to the second output of the comb filter in series The first lowpass filter, the first adder and the luminance signal video amplifier are connected to the fourth input of the matrix unit; The second second low-pass filter, the third low-pass filter and the second adder, the second input of which is connected to the output of the entered fourth low-pass filter, whose input is connected to the output of the entered two-way amplitude limiter, the input of which is connected to the output of the second low-pass filter, whose input connected to the first output of the comb filter, and the output of the second adder is connected to the second input of the first adder. FIG. 1 shows a structural electrical circuit of the aperture corrector of a color TV receiver; FIG. 2-4 - amplitude characteristics of the third low-pass filter, double-sided amplitude limiter from the bottom and the second adder, respectively. The corrector (Fig. 1) contains the source 1 of the full color television signal, a comb filter 2, a chrominance unit 3, a matrix 4 unit, a color kinescope unit 5, the first low-pass filter 6, the first adder 7, the luminance video amplifier 8, the second filter 9 lower frequency, the third low-pass filter 10 second adder 11, two-way amplitude limiter 12 below and the fourth low pass filter 13. Corrector works as follows. Source 1 of a full color television signal containing luminance and chrominance components, feeds TV signals to the input of a comb filter 2, for example, using charge-coupled devices (CCD). The components of brightness and chromaticity are soldered in the frequency spectrum of a TV signal with relatively alternating frequencies. The luminance signal has a relatively wide range (from constant current or zero frequency to about 4 MHz). The upper frequency band of the luminance signal is filled, besides it, with a chrominance signal consisting of a 3.58 MHz signal subcarrier, which is amplitude and phase modulated with color information. The amplitude-frequency characteristic of the comb filter has a cone dependence with a period multiple of the horizontal frequency (approximately 15734 Hz) and is equal to zero at frequencies multiple of the odd half of the horizontal frequency, including the frequency of the chromaticity subcarrier 3.58 MG Filtered signal: luminance (Y) from the second output of the comb 444 filter 2 flows through the first low-pass filter 6 to the first input of the first adder 7. The first filter 6 passes all the luminance signals below the cut-off frequency (approximately 4 MHz) and serves to exclude and a frequency switching components synchronizing signals associated with the switching of the comb filter in E 2 when it is formed on the CCD devices. The filtered chrominance signal (C) from the first output of the comb filter 2 is fed to the chrominance unit 3, where the color difference signals R-4 and B-Y are formed, and to the input of the second low-pass filter 9. Block 3 contains a filter that transmits only frequencies that lie in the frequency range of the chroma signal. The second filter 9 has a cutoff frequency of about 1.8 MHz and transmits signals that carry information about the vertical intensity in the luminance signal, which was excluded from the filtered luminance signal and which must be restored in the luminance signal to avoid loss of vertical resolution in luminance co-generated image. For this, the vertical output signals from the output of the second filter 9 are fed through the third low-pass filter 10 to the first input of the second adder 11, the cut-off frequency of the third filter 10 is approximately 2 MHz, and its amplitude characteristic (Fig. 2) is linear and constant for positive and negative signals. The magnitude of the gain over this channel corresponds to the magnitude needed to restore the luminance signal, so that ultimately the newly reconstructed luminance signal has a flat amplitude frequency response with respect to the small amplitude signals. The vertical signal from the output of the second filter 9 is also fed to the input of the two-way amplitude limiter 12 from below, and from it through the fourth filter 13 to the second input of the second adder 11. The combination of the second 9 and 10 of the third filter sets the width of the first channel signal, and the combination of the second filter 9 with the fourth filter 13 sets the bandwidth of the second gain channel signal so that the chrominance signal frequencies are greatly attenuated. In this case, the fourth low-pass filter 13 has a center frequency and about 1.8 MHz isluzhit to improve image sharpness, especially with respect to effects koto rye may vits as visible claim voltage on the diagonal edge of the reproduced image pattern. A two-way amplitude limiter 12 will hold a diode-limiting circuit consisting of two diodes connected in reverse-parallel, each of which conducts, respectively, a signal opposite to polarity. The amplitude characteristic of the two-way amplitude limiter 12 at the bottom contains three areas for three predetermined amplitude ranges of the vertical I-detail signal (FIG. 2). In the character field, the stick corresponds to zero gain for low level signals (for example, with an amplitude of about 5% of the maximum expected amplitude), i.e. the cutting circuit suppresses low level signals to prevent amplification in the channel along with noise and other undesirable components. Vertical datasets with an average amplitude (for example, signals with amplitudes from 5 to 40% of the maximum expected amplitude) in area II are transmitted with a gain of, for example, approximately three, to thereby provide information about the vertical detail and increase the contrast of the TV image in this area. Signals of vertical detail with a relatively large amplitude (for example, signal amplitudes corresponding to a high-contrast image, such as inscriptions) are reduced in amplitude or cut off according to the amplitude characteristic in the 1H area to avoid excessive contrast and prevent color distortions on the curves and to prevent color distortions on the curves and to prevent excessive distortions and worn colors. which otherwise impairs image clarity. The combined signal of vertical detail, terminated at the output of the second adder 11, has an amplitude response (FIG. 4) equal to the sum of the amplitude characteristics of both channels. The processed vertical detail signal appearing at the output of the second adder 11 is summed in the first adder 7 with the filtered luminance signal fed through the first filter 6. The output signal of the first adder 7 corresponds to the TV luminance signal, the information about the vertical detail of which is reconstructed and amplified as described by Bbmje, and fed to video amplifier 8, Enhanced luminance signal and color difference: the left signals from chrominance unit 3 are combined in matrix block 4 to form R, G and B color signals, pre Tavlya S., their color image. These signals are then appropriately supplied to the image brightness control electrodes of the block 5 of color kines. a cop. The propagation delays in the first and second channels are equalized by delays in the third 10 and fourth 13 filters. In addition, the delays in the propagation of the signal between the second outputs of the comb filter 2 and the first input of the first adder 7 and between the first output of the comb filter 2 and the second input of the first adder 7 are equalized with the delay in the first filter 6 and the delays of the second 9j third 10 and fourth 13 filters in channel signal ventikal detail. The first 7 and second 11 day processors can be replaced with one three-input cy f mater. Thus, the invention makes it possible to increase the degree of vertical aperture correction.
    / Fig. 2
    .
    ig.
    权利要求:
    Claims (1)
    [1]
    Aperture corrector of a color television receiver, comprising a source of a full color television signal, a comb filter, a color block and a matricing unit, the three outputs of which are connected to the corresponding inputs of the color tube block, while the second output of the comb filter is connected through a first low-pass filter connected in series, a first adder and a video amplifier of the luminance signal with a fourth input of the matrixing unit, characterized in that, in order to increase the degree and vertical aperture correction, a second and third low-pass filter, a third low-pass filter and a second adder are introduced in series with it, the second input of which is connected to the output of the introduced fourth low-pass filter, the input of which is connected to the output of the introduced two-sided amplitude limiter from the bottom, the input of which connected to the output of the second low-pass filter, the input of which is connected to the first output of the comb filter, and the output of the second adder is connected to the second input of the first. th adder.
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    同族专利:
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    PL224176A1|1981-02-27|
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    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE2053513C3|1970-10-31|1975-08-14|Robert Bosch Gmbh, 7000 Stuttgart|Method and arrangement for avoiding the loss of resolution in the vertical direction of a color television picture|
    US3715477A|1971-03-11|1973-02-06|Rca Corp|Video signal noise-limiting apparatus|
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    TWI430653B|2009-03-13|2014-03-11|Asustek Comp Inc|Image processing device and image processing method|
    TWI390961B|2009-03-13|2013-03-21|Asustek Comp Inc|Image processing device and image processing method|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US06/038,202|US4223339A|1979-05-11|1979-05-11|Video image vertical detail restoration and enhancement|
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