KR950004026B1 - Adaptive luma/chroma separation apparatus - Google Patents

Abstract

a band passing filter for passing a signal of a chrominance sub-carrier band; 2 and 3-dimension luminance/color signal separators for separating the signal, and outputting the correction signal and the control signal; a first mixer for respectively selecting the luminance signal having smaller superposing component; a second mixer for selectively outputting a baseband passing filter's signal.and a band passing filter for passing through the signal of the color-negative carrier from the composed image.

Description

Spectral Distribution Adaptive Luminance / Color Signal Separator for Quadrature Modulated Color Television Receiver

1 is a diagram showing a spectral distribution of a video signal of a general quadrature modulated color television receiver.

2 is a diagram showing a spectral distribution of a luminance signal and a color signal in the vicinity of a color carrier.

3 is a circuit diagram showing a conventional luminance signal comb filter.

4 is a circuit diagram showing a conventional color signal comb filter.

5 is a waveform diagram showing a composite video signal passing through a conventional luminance signal comb filter and a color signal comb filter.

6 is a circuit diagram showing a conventional motion adaptive luminance / color signal separation device.

(A) and (b) of FIG. 7 show spectral distributions of a superstructure and a superstructure of a luminance signal and a color signal;

8 is a circuit diagram for separating luminance signals in the luminance / color signal separation device of the present invention.

9 is a circuit diagram for separating color signals in the luminance / color signal separation device of the present invention.

10 is a detailed view of the 2H compensator and the 2F compensator of FIGS. 8 and 9;

11 is a view for explaining the characteristics of the corrector of FIG.

12 is a view for explaining a composite video signal corrected by the corrector of FIG.

(A)-(c) of FIG. 13 is a circuit diagram showing an embodiment of using the compensator of FIG.

(A)-(e) of FIG. 14 are diagrams for explaining the operating characteristics of FIG.

15 is a detailed view of the mixer of FIG.

16 is a detailed view of the two-dimensional and three-dimensional luminance signal separator of FIG.

17 is a detailed view of the two-dimensional and three-dimensional color signal separator of FIG.

18 is a detailed view showing an embodiment of the overall configuration of the luminance / color signal separation device of the present invention.

* Explanation of symbols for the main parts of the drawings

30,40: band pass filter 31: low pass filter

32,41: 2D luminance / color signal separator 33,42: 3D luminance / color signal separator

32A: 2H luminance signal comb filter 33A: 2F luminance signal comb filter

33B, 41B: 2H compensator 33B, 41B: 2F compensator

32C, 33C: Control 34: Orcaide

35,36,43,44,55,61,74,84,86: Adder 37,45,79: Comparator

38,39,46: Mixer 51,52,70,71,90,91: Delay

53,54,72,73,75,77,78,82,83,85,87,88: Amplifier

62: selector CV: composite video signal

The present invention is adaptive to the spectrum distribution of an orthogonally modulated color television receiver which separates the luminance signal and the color signal by adapting to the spectrum distribution of the composite video signal in the quadrature modulated color television receiver of the NTSC method and the PAL method. The present invention relates to a luminance / color signal separation device. In particular, the luminance signal and the color signal are separated by using the overlap of the spectrum of the luminance signal and the spectrum of the color signal on the vertical axis and the time axis, thereby preventing dot interference due to cross color and cross luminance. A spectrum distribution adaptive luminance / color signal separator of an orthogonal modulated color television receiver which prevents the blurring of the Kali signal and the vertical resolution from being reduced.

NTSC type color TV signal is a color signal by orthogonally modulating the chroma signal I and Q signals to the color subcarrier frequency (about 3.5MHz) for compatibility with existing black and white signals. t)), (Q (t)) and C (t)) = I (t) cos (2πfsc + 33 ^o ) + Q (t)) SIN (2πfsc + 33 ^o ) for the color carrier frequency fsc.

I, Q signals, which are chromaticity signals, are obtained by matrix-processing red, blue, and green signals obtained from a camera. In the present invention, color signals mean signals obtained by orthogonally modulating I, Q signals, which are chromaticity signals, as described above. .

On the other hand, a color signal in the NTSC system is being obtained by quadrature modulating the color signal to a color subcarrier frequency, color sub-carrier and the line frequency (f _n) (approximately 15.75kHz) and the relationship is fsc = 455f _n / 2, line-frequency and field The relationship with the frequency f _v (60 Hz) holds that f _v = 525 _H / 2, so that the color signal has the form shown in FIG. 1 when viewed in the horizontal frequency domain, and the luminance signal when viewed in the vertical frequency domain. The interpolated form between the spectrums of Fig. 2 (or Fig. 2, Fig. 5 or Fig. 7A), and in the time-frequency domain, as in the vertical frequency domain, interfere with the spectrum of the luminance signal (Fig. 2). Or (b) of FIG. 5 or 7.

As a result, the luminance / color signal separation is intended to accurately separate the luminance signal and the color signal (so that the luminance signal and the color signal spectrum do not interfere) from the composite video signal in which the luminance signal is mixed with the color signals (I and Q chroma signals). .

In other words, in general, the NTSC and PAL orthogonal modulated color television broadcasting systems transmit and interleave color signals to luminance signals for efficient use of limited frequency bands, and these color television receivers receive and separate them. Doing. At this time, if the color television receiver incorrectly separates the luminance signal and the color signal, image quality degradation such as dot interference, blurring of the color signal, and decrease in resolution may occur.

In order to prevent such degradation, conventionally, the color signal phase of orthogonally modulated color television broadcasting signal is optimized by optimizing pH, temperature, time, concentration, etc. every line, and properly adjusting oxidation conditions accompanying dissolution process. The conversion rate to monomer is 95% or more, and the frame comb filter is used. The line comb filter and the frame comb filter are improved. The motion adaptation of the line comb filter and the frame comb filter to the motion of the composite video signal is performed. Type luminance / color signal separation device is used.

This conventional technique will be described in detail with reference to the drawings of FIGS. 1 to 6.

1 is a diagram showing the spectral distribution of a video signal of a general quadrature modulated color television receiver. As can be seen, the luminance signal Y has a bandwidth of 4.2 MHz, and the color signals I and Q have bandwidths of about 1.5 MHz and 0.5 MHz, respectively, centering on the color subcarriers fsc = 3.58 MHz.

2 is a diagram showing the spectral distribution of the luminance signal and the color signal in the vicinity of the color sub-wave. As shown therein, the spectrum of the luminance signal Y is nFn (where n is an integer and Fn is a line frequency of about 15.75 KHz). ), And the spectrum of the color signal C appears repeatedly around (2n + 1) and Fn / 2, and in the case of an image signal having a vertical change, the luminance signal Y and the color signal C It can be seen that the interference phenomenon between the spectra increases.

3 is a circuit diagram of a luminance signal comb filter for separating the luminance signal Y from the composite image signal CV. As shown therein, a band pass filter 1 for detecting a signal of a color carrier band in the composite image signal CV And delayers (2) and (3) connected in series with the bandpass filter (1) to sequentially delay the output signal V1 of the bandpass filter (11), and the bandpass filter (1) and the delayer. The amplifiers 4 and 5 which amplify the output signals V1 and V3 of (3) 1/2 times, respectively, and the output signals V2 and the output signals of the amplifiers 4 and 5 of the delay unit 2 are added. The adder 6 and the amplifier 7 amplify the output signal of the adder 6 times.

Here, 2H (where H is one line of horizontal synchronization signal) comb filter when the delay period of the delayers 2 and 3 is one line period, and 2F (when the delay period is one frame period). Where F is a frame period).

In the conventional luminance signal comb filter having such a configuration, the synthesized video signal V1 passed through the band pass filter 1 is sequentially delayed by the retarders 2 and 3 and output as the synthesized video signals V2 and V3. The video signals V1 and V3 are each amplified 1/2 times in the amplifiers 4 and 5, added with the composite video signal V2 in the adder 6, and amplified 1/2 times in the amplifier 7, and finally output signals. You get V0 = (V2 + (V1 + V3) / 2) / 2.

4 is a circuit diagram of a color signal comb filter for separating the color signal C from the composite video signal CV. As shown in the drawing, the color signal comb filter is a band pass filter 11 and a retarder like the luminance signal comb filter. (12, 13), an adder (16), and an amplifier (17), and instead of the amplifiers (4, 5), the amplifiers (14, 15) having a half amplitude at -1/2 are provided.

The color signal comb filter is also a 2H comb filter when the delay period of the delay units 12 and 13 is one line period, and the band pass filter 11 and the delay units 12 and 13 as a 2F comb filter when the delay period of the delay units 12 and 13 is one frame period. Finally, the output signals V0 = (V2- (V1 + V3) / 2) / 2 are finally obtained by combining the composite video signals V1, V2, and V3 respectively outputted from.

However, when the luminance signal comb filter and the color signal comb filter are 2H comb filters, the luminance signal and the color signal are incompletely separated from each other, and as a result, between the luminance signal Y and the color signal C as shown in FIG. There is a problem that the vertical resolution of the video signal is reduced by the occurrence of interference, an overlap component.

When the luminance signal comb filter and the color signal comb filter are 2F comb filters, the luminance signal and the color signal are accurately separated from the still image signal, but the luminance and color signals are incompletely separated from the moving area, thereby causing serious image quality degradation. There is a problem that occurs.

As one of the methods for improving the problems of the comb filter, a motion adaptive luminance / color signal separation device has been developed as shown in FIG.

The motion-adaptive gray loop / color signal separating device filters the composite video signal (CV) in line and frame periods respectively to output a luminance / color signal and a frame comb filter (21) and a frame comb filter (22), and a composite video. A motion detector 23 for detecting the movement of the signal CV and a mixer for selectively outputting the output signals of the line comb filter 21 and the frame comb filter 22 according to the output signal of the motion detector 23. It consisted of (24).

In the conventional motion-adaptive luminance / color signal separation device configured as described above, the line comb filter 21 and the frame comb filter 22 separate the luminance / color signals from the composite video signal CV by line and frame periods, respectively. ), The motion detector 23 detects the motion, that is, the change, of the composite video signal CV and inputs a control signal to the mixer 24.

Then, the mixer 24 selects and outputs the luminance / color signal separated by the line comb filter 21 when there is motion of the composite video signal CV, and the frame comb filter 22 separates when there is no motion. One luminance / color signal is selected and output.

However, if the motion-adaptive luminance / color signal separation device such as a shopping mall detects the movement of the composite video signal (CV) correctly, the motion adaptive luminance / color signal separation device accurately separates and outputs the luminance / color signal, thereby making the picture very clean. When the composite image signal (CV) mixed with the signal and the color signal is input, the accuracy of motion determination is reduced. As a result, the image quality is deteriorated. Incorrect separation of luminance / color signal causes rainbow pattern or dot interference due to cross talk and cross luminance, and chroma signal resolution decreases when incorrectly detecting synthetic motionless signal (CV) as motionless. Blurring occurs and image quality deterioration occurs due to cross-tracking of luminance and color signals. The.

In addition, even when the motion of the composite video signal CV is accurately detected, if the composite video signal CV has a sudden change in the vertical and time axis directions, the image quality is deteriorated due to the mutual interference between the luminance signal and the color signal. When the video signal is suddenly changed in the vertical axis direction in the color television broadcasting system used, the overlap between the spectral components of the gray signal and the color signal increases in the fine-structure spectrum shown in FIG. In the case of a sudden change in the time axis direction, the overlap between the spectral components of the luminance signal and the color signal in the spectrum of the super fine structure shown in (b) of FIG. 7 increases, so that the motion detector 23 uses the composite image signal (CV). Specification of luminance signal and color signal in composite video signal (CV), which has a large variation in vertical axis time. Overlapping components of the trum were generated, resulting in deterioration of image quality such as cross color and cross luminance.

In order to solve the above-mentioned conventional problems of the present invention, the degree of overlap between the spectrum of the luminance signal and the color signal is detected on the vertical axis and the time side, and the luminance on the vertical axis is reduced to the degree of overlap between the detected spectra. Color signal separation and luminance / color signal separation on the time axis are properly performed. Also, by simply correcting errors to eliminate overlapping components between spectra, dot interference due to cross color and cross luminance and blurring of color signals are perpendicular. It is an object of the present invention to provide a spectral distribution adaptive luminance / color signal separation device that prevents the resolution from being reduced. This will be described in detail with reference to the accompanying drawings of FIGS. 8 to 18.

FIG. 8 is a circuit diagram for separating luminance signals in the luminance / color signal separation device of the present invention. As shown therein, a band pass filter 30 through which a signal of a color carrier band is passed through a composite image signal CV is synthesized. A low pass filter 31 which passes a low pass signal of 2 MHz or less from the image signal CV, and a luminance signal is filtered from an output signal of the band pass filter 30 to output a correction signal along with an output term and a luminance signal. And a two-dimensional luminance signal separator 32 and a three-dimensional luminance signal separator 33 for detecting whether the interference between the spectrum of the color signal and the spectrum of the color signal is greater than or equal to a preset threshold level TH1 (TH2) and outputting a detection signal. Correction is performed on the OR gate 34 for ORing the detection signals output from the 3D and 3D luminance signal separators 32 and 33 and the luminance signals output from the 2D and 3D luminance signal separators 32 and 33. To add and output signals In accordance with the output signal of the comparator 37 and the comparator 37 for comparing the level of the correction signal output by the adder 35, 36, the two-dimensional and three-dimensional luminance signal separators 32, 33 A mixer 38 for selecting and outputting a small signal from an output signal of the adders 35 and 36 and an output signal of the low pass filter 31 or a low pass according to the output signal of the oragate 34. The mixer 39 was configured to select a signal obtained by adding the output signals of the filter 31 and the mixer 38 as the luminance signal and output the luminance signal Y as a luminance signal.

The 2D and 3D luminance signal separators 32 and 33 are 2H luminance signal comb filters 32A for filtering and outputting luminance signals while delaying the output signals of the bandpass filter 30 by 2H and 2F, respectively; 2H luminance signal comb filter 33A, 2H compensator 32B and 2F compensator 33B for detecting a correction signal while delaying the output signal of bandpass filter 30 by 2H and 2F, respectively, and said bandpass filter 30 The controller 32C (33C) outputs a detection signal by detecting whether the interference level between the luminance signal and the spectrum of the color signal is greater than or equal to the preset threshold level (TH1) (TH2).

In the luminance / color signal separation device of the present invention configured as described above, the circuit for separating the luminance signal includes the color-carrier band signal from the input composite video signal (CV), which is filtered by the band pass filter (30) and outputs less than or equal to 2.1 MHz. The low pass signal of is filtered by the low pass filter 31 and input to the mixer 39.

The signals of the color carrier bands output from the band pass filter 30 are input from the two-dimensional and three-dimensional luminance signal separators 32 and 33, so that the 2H and 2F luminance signal comb filters 32A and 33A are of the color part carrier band. While the signals are delayed by 2H and 2F, respectively, the luminance signal is filtered and output, and the 2H and 2F compensators 32B and 33B detect and output correction signals while delaying signals of the color carrier bands by 2H and 2F, respectively, and the controller (32C). (33C) compares whether the interference level between the luminance signal and the spectrum of the color signal in the signal of the color carrier band is greater than or equal to the threshold level (TH1) (TH2), so that the threshold level (TH1) (TH2) is larger than the interference level. In this case, a high potential detection signal is output.

Then, the detection signals output from the controllers 32C and 33C are logically summed at the oragate 34 and input to the mixer 39 as control signals, which are output by the 2H and 2F luminance signal comb filters 32A and 33A. The adder 35, 36 adds the correction signal output by the 2H and 2F compensators 32B and 33B to the luminance signal and inputs it to the mixer 38 as a corrected gray signal, and the 2H and 2F compensators 32B. The level of the correction signal output from the 33B is compared by the comparator 37 so that the comparison signal is input to the mixer 38 as a control signal.

Therefore, the mixer 38 selects and outputs a signal having a small level from the output signals of the adders 35 and 36 according to the output signal of the comparator 37, and the mixer 39 outputs the output signal of the oragate 37. When the interference level between the luminance signal and the spectrum of the color signal is higher than the threshold level (TH1, TH2), the output signal of the low pass filter 31 is selected and output as the luminance signal, and the threshold level (TH1, TH2) is output. If not, the output signal of the low pass filter 31 and the mixer 38 is added and output as a luminance signal.

9 is a circuit diagram for separating color signals in the luminance / color signal separation device of the present invention. As shown therein, a band pass filter 40 for passing a signal of a color carrier band in a composite image signal CV, and A two-dimensional color signal separator 41 and a three-dimensional color signal separator 42 for filtering a color signal from an output signal of the band pass filter 40 and outputting a correction signal together with an output term; and the two-dimensional and three-dimensional color Adders 43 and 44 for adding overlapping signals from the color signals output from the signal separators 41 and 42 to remove overlapping components between the luminance signal and the spectrum of the color signal, and the two-dimensional and three-dimensional color signals. The comparator 45 comparing the levels of the correction signals output by the separators 41 and 42 and the output signal of the adders 43 and 44 are output according to the output signal of the comparator 45. The mixer 46 selects and outputs the color signals. Configured.

The 2D and 3D color signal separators 41 and 42 are 2H color signal comb filters 41A for filtering and outputting color signals while delaying the output signals of the band pass filter 40 to 2H and 2F, respectively. The 2F color signal comb filter 42A and the 2H compensator 41B and 2F compensator 42B which detect the correction signal while delaying the output signals of the bandpass filter 40 at 2H and 2F, respectively.

In the luminance / color signal separation device of the present invention configured as described above, the circuit for separating the color signal is output by filtering the band-pass filter 40 the signal of the color carrier band in the composite video signal CV inputted, and outputting the color. The signals of the subcarrier bands are input to the two-dimensional and three-dimensional color signal separators 41 and 42, and the 2H and 2F color signal comb filters 41A and 42A decrement the colors of the color subcarrier bands while respectively delaying the 2H and 2F colors. The signal is filtered and output, and the 2H and 2F compensators 41B and 42B detect and output a negative level correction signal while delaying the signals of the color carrier bands 2H and 2F, respectively.

Then, the adders 43 and 44 add the correction signals output by the 2H and 2F compensators 41B and 42B to the color signals output by the 2H and 2F color signal comb filters 41A and 42A. That is, the adder 43 adds a correction signal outputted by the 2H compensator 41B to the color signal outputted by the 2H color signal comb filter 41A to remove the overlapping component between the spectra of the color signals. The overlapping component between the luminance signal and the spectrum of the color signal is removed and output from the spectrum of the signal structure of the luminance signal and the color signal as shown in (a), and the adder 44 outputs the color signal output by the 2F color signal comb filter 42A. The correction signal output from the 2F compensator 42B is added to remove the overlapping component between the luminance signal and the spectrum of the color signal in the spectrum of the supersignal structure of the luminance signal and the color signal as shown in FIG. And output.

Then, the comparator 45 compares the level of the correction signal output from the 2H compensator 41B and the 2F compensator 41B, and applies the comparison signal to the mixer 46 as a control signal, so that the mixer 46 adds 43. In the color signal outputted by the reference numeral 44, a color signal having a small overlapping component between the luminance signal and the color signal is selected and output.

FIG. 10 is a detailed view of the 2H compensators 32B, 41B and 2F compensators 33B, 42B used in FIGS. 8 and 9, as shown therein, showing the output of the bandpass filters 30, 40. FIG. Delays 51 and 52 for sequentially delaying the signal V11, and output signals V11 of the band pass filters 30 and 40 and output signals V12 of the delay 52 are respectively 1/2. An amplifier (53) (54) for amplifying double and -1/2 times, an adder (55) for adding the output signals of the amplifiers (53), (54) and outputting a correction signal (V0), and an absolute value generator It consisted of (56).

Here, if the delay period of the delayers 51 and 52 is 1H period, it is 2H compensator 32B (41B), and if it is 1F period, it is 2F compensator 33B and 42B.

The compensator configured in this way is the output signal (V11) of the band pass filter (30, 40) is amplified 1/2 times in the amplifier 53 is input to the adder (55) and through the delay (51, 52) sequentially Delayed, the output signals of the delayers 51 and 52 are amplified by -1/2 times through the amplifier 54 and then input to the adder 55, and the output of the adder 55 is the absolute value generator 56. The absolute value is processed at and the correction signal V0 = | (V11-V12) | / 2 is output.

As shown in FIG. 11, the compensator extracts a hatched portion, which is an overlap region of the spectrums of the luminance signal Y and the color signal C, which have passed through the comb filter, and outputs a correction signal V0. As shown in FIG. 12, the luminance signal and the color signal are output after the overlapping region between the spectra is removed, as shown by the portions of the luminance signal Y and the color signal C subtracted through the comb filter and shaded.

13 is a circuit diagram showing an embodiment of the use of the compensator.

As shown in FIG. 13A, the compensators 32B, 33B, 41B, and 42B detect and output correction signals from the output signals of the bandpass filters 30 and 40, and the bandpass filters 30 and 40 are detected. The subtractor 35, 36, 43, 44 subtracts the correction signal from the output signal of the input signal and inputs it to the comb filters 32A, 33A, 41A, and 42A to filter and output the corrected luminance and color signals. FIG. 13B shows that the comb filters 32A, 33A, 41A, and 42A filter and output the luminance and color signals from the output signals of the band pass filters 30 and 40, and the compensators 32B and 33B. And 41B and 42B detect and output a correction signal, and subtracters 35, 36, 43, and 44 subtract the correction signal from the luminance signal and the color signal to output the corrected luminance signal and the color signal. 13C shows that the comb filters 32A, 33A, 41A, and 42A filter luminance signals and color signals from the output signals of the band pass filters 30 and 40, and the comb filters The luminance signal output from the comb filter 32A, 33A, 41A, 42A, and the compensator 32B, 33B, 41B, 42B detect and output the correction signal from the output signals of the data sources 32A, 33A, 41A, 42A. The subtractors 35, 36, 43, and 44 subtract the corrected signals output by the correctors 32B, 33B, 41B, and 42B from the color signals to output the corrected luminance and color signals.

The compensator of the present invention used in this way has a cumulative component such as a hatched portion between the spectrums of the luminance signal Y and the color signal C as shown in (a) of FIG. 14, as shown in (b) of FIG. For example, if it is assumed that the component of the color signal such as the shaded portion is present in the luminance signal filtered by the comb filter, the correction is made with the circuit shown in (a) of FIG. 13, and as shown in (c) of FIG. Correction is performed in the same manner, and correction is made using the circuit shown in (b) and (c) of FIG. 13, as shown in (d) (e) of FIG.

As can be seen from the present invention, the interference phenomenon between the spectrum of the luminance signal and the color signal is significantly reduced than the case of simply filtering and outputting the luminance signal and the color signal with a comb filter, and the circuit shown in (b) of FIG. The most significant reduction is the interference phenomenon, but the resolution of the luminance signal is the lowest, and according to the design time interference phenomenon and resolution of the circuit, the interference shown in (a)-(c) of FIG. 13 is appropriately used. You can configure it to eliminate the phenomenon.

FIG. 15 is a detailed view showing the configuration of the mixer 39 of FIG. 8, as shown therein, an adder 61 for adding output signals of the low pass filter 31 and the mixer 38, and an oragate 34. As shown in FIG. The selector 62 selects and outputs the output signal of the low pass filter 31 or the adder 61 in accordance with the output signal of the "

The mixer 38 configured as described above is inputted to the selector 62 while the output signal of the low pass filter 31 is input to the adder 61, mixed with the output signal of the mixer 38, and then input to the selector 62. Since the output signal of the oragate 34 is input to the selector 62 as a control signal, the selector 62 outputs the output signal of the low pass filter 31 or the adder 61 according to the output signal of the oragate 34. Selective output by the luminance signal Y, that is, the mixer 38 selects the output signal of the low pass filter 31 as the luminance signal when the interference level between the luminance signal and the color signal is higher than or equal to the preset dress hold level (TH1, TH2). When the output signal is not equal to or above the threshold level (TH1, TH2), the addition signal of the output signal of the low pass filter 31 and the mixer 38, which are the output signals of the adder 61, is selected and output as the luminance signal. .

FIG. 16 is a detailed view of the two-dimensional and three-dimensional luminance signal separators 32 and 33 of FIG. 8, as shown therein and connected in series to delay the output signal of the bandpass filter 30. 71, amplifiers 72 and 73 for amplifying the output signals of the bandpass filter 30 and the delayer 1/2, respectively, and the delayers 70 and amplifiers 72 and 73. An adder 74 that adds an output signal of the amplifier, an amplifier 75 that inverts and amplifies the output signal of the amplifier 73, an adder 76 that adds an output signal of the amplifiers 72, 75, and The absolute value generator 100 that processes the output of the adder 76 and the output signals of the adder 74 and the absolute value generator 100 are inverted and amplified by 1/2 times, respectively. The amplifiers 77 and 78 outputting the luminance signal and the correction signal to the 35 and 36, and the magnitudes of the output signal of the absolute value reproducer 100 and the preset threshold levels TH1 and TH2 are compared. ratio It formed the signal to a comparator 79 for outputting a control signal to the Iowa gate 34.

When the delay periods of the retarders 70 and 71 are 1H periods, the two-dimensional luminance signal separator 32 is used.

The two-dimensional and three-dimensional luminance signal separators 32 and 33 configured in this way include the delayers 70 and 71, the amplifiers 72, 73 and 77, and the adder 74 in the 2H and 2F luminance signal comb filters 32A ( 33A), the luminance signal is filtered and output to the subtractors 35 and 36, and the delayers 70 and 71, the amplifiers 72, 73, 75 and 78, the adder 76 and the absolute value generator 100 2H and 2F compensators 32B and 33B detect the correction signal, which is an overlapping component between the luminance signal and the spectrum of the color signal, and output the correction signal to the mixers 35 and 36, and the delayers 70 and 71 and the amplifiers 72, 73, 75, the adder 76, the absolute value generator 100, and the comparator 79 are controllers 32C, 33C, and overlapping components between the spectrum of the gray signal and the color signal and the set threshold level (TH1) are mirrored. And detects the magnitude of TH2) and outputs a control signal.

FIG. 17 is a detailed view of the two-dimensional and three-dimensional color signal separators 41 and 42 of FIG. 9, as shown therein and connected in series to delay the output signal of the bandpass filter 40. 81, amplifiers 82 and 83 for amplifying the output signals of the band pass filter 40 and the delay unit 81 by -1/2, respectively, and the delay unit 81 and the amplifier 82 ( An adder 84 that adds an output signal of 83, an amplifier 85 that inverts and amplifies the output signal of the amplifier 82, and an adder 86 that adds an output signal of the amplifiers 83 and 85; And an absolute value generator 200 that processes an absolute value of the output of the adder 86, and an output signal of the adder 84 and the absolute value reproducer 200 1/2 times and inverted, respectively. Amplifiers 87 and 88 which output color signals and correction signals to (43 and 44).

In the above description, if the delay periods of the delay units 80 and 81 are 1H periods, the two-dimensional color signal separators 41 are used.

In the two-dimensional and three-dimensional color signal separators 41 and 42 configured in this manner, the retarders 80 and 81, the amplifiers 82, 83 and 87, and the adders 84 are composed of 2H and 2F color signal comb filters 41A ( 42A), the color signal is filtered and output to the subtractors 43 and 44, and the delay units 70 and 71, the amplifiers 82, 83, 85 and 88, the adder 86 and the absolute value generator 200 The overlapping components between the luminance signal and the spectrum of the color signal are detected by the 2H and 2F compensators 41B and 42B and output to the mixers 43 and 44.

FIG. 18 is a detailed view showing the detailed configuration of the circuit shown in FIG. 13B in the luminance / color signal separation device of the present invention.

As shown here, the luminance of which the overlapping component between the luminance signal and the spectrum of the color signal is corrected in the spectrum of the fine structure as shown in FIG. 7A by combining the two-dimensional luminance / color signal separators 32 and 41 into one Signal and color signals are output, and the three-dimensional gray / color signal separators 33 and 42 are also combined into one, and the overlapping component between the luminance signal and the spectrum of the color signal in the spectrum of the super fine structure as shown in (b) of FIG. The corrected luminance signal and color signal are output, and the luminance signal and the color signal output from the two-dimensional and three-dimensional luminance / color signal separators 32, 41, 33, 42 are composed of a luminance signal having a small overlapping component between spectra. Each of the color signals is output, and the mixer 39 controls the output signal of the low pass filter 31 when there are many overlapping components between the luminance signal and the spectrum of the color signal under the control of the output signal of the oracle 34. Output with overlapping When the minutes are small, the mixed signal of the mixer 38 and the low pass filter 31 is output as a luminance signal.

As described in detail above, the present invention detects an overlapping component between a luminance signal and a spectrum of a color signal, corrects the detected overlapping component, outputs an intensity signal and a color signal, and in the case where there are many overlapping components, low pass By outputting the output signal of the filter as a luminance signal, degradation of image quality such as rainbow pattern and dot interference due to cross-track and cross-luminescence can be eliminated, and the resolution can be prevented from being reduced.

Claims (12)

A band pass filter 30 for passing a signal of a color carrier band in the composite video signal CV, a low pass filter 31 for passing a low luminance signal in the composite meditation signal CV, and the band pass filter Detects and outputs a color signal from the output signal of 30, and outputs an overlapping component between the luminance signal and the spectrum of the color signal as a correction signal, and determines whether the overlapping component is above a preset threshold level (TH1) (TH2). The two-dimensional luminance / color signal separator 32 and the three-dimensional luminance / color signal separator 33 and the two-dimensional and three-dimensional luminance / color signal separators 32 and 33 respectively output a control signal. An adder 35 which adds a correction signal to the luminance signal output from the orifice 34 for ORing the control signal and the two- and three-dimensional luminance / color signal separators 32 and 33 and outputs the corrected luminance signal. 36) and the two-dimensional and three-dimensional luminance / color signals A comparator 37 for comparing the levels of correction signals output by the separators 32 and 33, and a comparator 37 among the luminance signals output by the two-dimensional and three-dimensional luminance / color signal separators 32 and 33; Mixer 38 for selecting and outputting a luminance signal having a small overlap component, respectively, and a threshold level (TH1) in which an overlap component between the spectrum of the luminance signal and the color signal is set according to the output signal of the oragate 34 according to the control of the " , When the output signal of the low pass filter 31 is selected and output, and the overlap component is less than or equal to the set threshold level (TH1, TH2), the combined signal of the low pass filter 31 and the mixer 38 is greater than or equal to TH2). A mixer 39 for outputting a signal, a band pass filter 40 for passing a signal of a color carrier band in the composite image signal CV, and a color signal detected from the output signal of the band pass filter 40 and outputs the color signal. Spectrum of luminance and color signals A two-dimensional luminance / color signal separator 41 and a three-dimensional luminance / color signal for outputting a control signal by outputting an overlap component of the liver as a correction signal and determining whether the overlap component is above a preset threshold level (TH1) (TH2). A divider 42 and adders 43 and 44 for adding a correction signal to the color signals output by the 2D and 3D luminance / color signal separators 41 and 42 to output a corrected color signal; Comparator 45 for comparing the level of the correction signal output by the two-dimensional and three-dimensional luminance / color signal separators 41, 42, and the two-dimensional and three-dimensional luminance / color signal separators 41, 42 Spectral distribution adaptive luminance / color signal of an orthogonal modulated color television receiver characterized in that it comprises a mixer (46) for selecting and outputting a small color signal having a small overlap component according to the control of the comparator (45) among the output color signals. Separator. The 2H luminance signal comb filter 32A according to claim 1, wherein the luminance signal separation of the two-dimensional luminance / color signal separator 32 filters and outputs the luminance signal while delaying the output signal of the band pass filter 30 by 2H. 2H compensator 32B for detecting the correction signal while delaying the output signal of the bandpass filter 30, respectively, and the interference level between the spectrum of the luminance signal and the color signal in the output signal of the bandpass filter 30. And a controller (32C) which detects whether or not the preset threshold level (TH1) is greater than the preset threshold level (TH1) and outputs a detection signal. The 2F luminance signal comb filter 33A according to claim 1, wherein the luminance signal separation of the three-dimensional luminance / color signal separator 33 filters and outputs the luminance signal while delaying the output signal of the band pass filter 30 by 2F. And a 2F compensator 33B for detecting the correction signal while delaying the output signal of the bandpass filter 30 by 2F, and an interference level between the spectrum of the luminance signal and the color signal in the output signal of the bandpass filter 30 in advance. A spectrum distribution adaptive luminance / color signal separator of an orthogonal modulated color television receiver, characterized in that it comprises a controller (33C) which detects whether or not the set threshold level (TH2) or more is set and outputs a detection signal. The 2H color signal comb filter 41A according to claim 1, wherein the color signal separation of the two-dimensional luminance / color signal separator 41 filters and outputs the color signal while delaying the output signal of the bandpass filter 40 by 2H. And a 2H compensator (41B) which detects a correction signal while delaying the output signal of the history passing filter (40) by 2H. The spectrum distribution adaptive luminance / color signal separator of an orthogonal modulated color television receiver. The color signal separation of the three-dimensional luminance / color signal separator 42 is a 2F color signal comb filter 42A that filters and outputs the color signal while delaying the output signal of the bandpass filter 40 by 2F. And an spectral distribution adaptive luminance / color signal separation device of an orthogonally modulated color television receiver characterized in that it comprises a 2F compensator (42B) for delaying the output signal of the bandpass filter (40) by a 2F delay and detecting a correction signal. . The delayer (51) and (52) according to claim 2 or 3, wherein the 2H compensator delays an output signal V11 of a bandpass filter for passing a signal of a color carrier band in the composite video signal to a vertical axis. And amplifiers 53 and 54 for amplifying the output signal V11 of the bandpass filter and the output signal V12 of the delayer 52 by 1/2 and -1/2 times, respectively, and the amplifier 53 And an absolute value generator 56 for generating an absolute value of the output value of the adder 55, by adding an output signal of " 54 " to output a correction signal V0. A spectrum distribution adaptive luminance / color signal separator of an orthogonally modulated color television receiver. 6. The delayer (51) (52) according to claim 4 or 5, wherein the 2F corrector delays the output signal (V11) of a band pass filter through which the signal of the color carrier band is passed in the composite video signal. And amplifiers 53 and 54 for amplifying the output signal V11 of the bandpass filter and the output signal V12 of the delayer 52 by 1/2 and -1/2 times, respectively. And an adder 55 for adding the output signals of 53 and 54 to output the correction signal V0, and an absolute value generator 56 for generating an absolute value of the output value of the adder 55. A spectrum distribution adaptive luminance / color signal separator of an orthogonal modulated color television receiver. 2. The output of the corrected luminance signal and color signal includes: a compensator (32B, 33B) in which an overlapping component between the spectrum of the luminance signal and the color signal in the output signal of the bandpass filter (30, 40) detects the correction signal; , 41B, 42B, adders 35, 36, 43, 44 for adding the output signals of the band pass filters 30, 40 and the compensators 32B, 33B, 41B, 42B, and the adder 35, Spectral Distribution Adaptive Luminance / Color of Orthogonally Modulated Color Television Receiver Featuring Comb Filters 32A, 33A, 41A, 42A Filtering Luminance Signals and Color Signals to Output Signals of 36, 43, 44 Signal separator. 2. The output of the corrected luminance signal and color signal comprises: a comb filter (32A, 33A, 41A, 42A) for filtering the luminance signal and the color signal from the output signals of the band pass filter (30, 40); A compensator 32B, 33B, 41B, 42B, in which an overlapping component between the luminance signal and the spectrum of the color signal is detected in the output signal of the comb filters 32A, 33A, 41A, 42A, and the comb filters 32A, Spectral distribution adaptation of an orthogonal modulated color television receiver characterized in that it comprises an adder (35, 36, 43, 44) that adds the outgoing signals of the 33A, 41A, 42A) and the correctors 32B, 33B, 41B, 42B. Type luminance / color signal separator. 2. The mixer (39) according to claim 1, wherein the mixer (39) includes an adder (61) for adding the output signals of the low pass filter (31) and the mixer (38), and the low pass filter (31) according to the output signal of the oragate (34). Or a selector (62) for selectively outputting the output signal of the adder (61). 4. The delayer (70) according to claim 2, wherein the two-dimensional three-dimensional win-win luminance / color signal separators (32, 33) are connected in series to delay the output signal of the band pass filter (30). 71, amplifiers 72 and 73 for amplifying the output signals of the bandpass filter 30 and the delayer 1/2, respectively, and the delayers 70 and amplifiers 72 and 73. An adder 74 that adds an output signal of the amplifier, an amplifier 75 that inverts and amplifies the output signal of the amplifier 73, an adder 76 that adds an output signal of the amplifiers 72, 75, and The absolute value generator 100 generating the absolute value of the output of the adder 76 and the output signals of the adder 74 and the absolute value generator 100 are each half-folded and inversely amplified. The amplifiers 77 and 78 outputting the luminance signal and the correction signal to the 35 and 36, and the output signal of the adder 76 and the magnitude of the preset threshold levels TH1 and TH2 are compared to obtain a comparison signal. On gate 34 Quadrature modulated color television spectrum distribution adaptive luminance / color signal separation apparatus of the receiver, it characterized in that the comparator consists of (7g) for outputting a control signal. 6. The retarder according to claim 4 or 5, wherein the two-dimensional and three-dimensional luminance / color signal separators (41) (42) are connected in series to delay the output signal of the band pass filter (40). 81, amplifiers 82 and 83 for amplifying the output signals of the bandpass filter 40 and the delay unit 81 at -1/2, respectively, and the delay unit 81 and the amplifier 82 ( An adder 84 that adds an output signal of 83, an amplifier 85 that inverts and amplifies the output signal of the amplifier 82, and an adder 86 that adds an output signal of the amplifiers 83 and 85; And an absolute value generator 200 generating an absolute value of the output of the adder 86, and an amplifier of the output signals of the adder 84 and the absolute value generator 200 by inversely amplifying and inverting each other. And an amplifier (87,88) for outputting a color signal and a correction signal to the (43, 44) spectrum adaptive adaptive luminance / color signal separation device for an orthogonal modulated color television receiver.