KR940000580B1 - Vertical and horizontal correlation for brightness and chroma signal discrimination - Google Patents

Abstract

The vertical/horizontal correlation adaptive luminance/ chrominance separator includes a comb filter for 1H comb-filtering video signal of three serial horizontal scanning lines, respectively, a band-pass filter for band -pass filtering 1H- delayed video signal output from the comb filter, a correlation data detector for detecting first-fourth correlation data, a correlation coefficient generator for generating a correlation coefficient, a MUX for adaptively outputting chrominance signal according to the coefficient output from the coefficient generator, and a luminance signal portion for removing the chrominance signal from the signal delayed by a delay compensator, thereby preventing dot crawl or crossed color from occurring.

Description

Vertical and horizontal correlation adaptive luminance and color signal separation circuit

1 is a conventional color signal separation circuit.

2 is a general color signal transition waveform diagram.

3 is a circuit diagram according to the present invention.

4 is an output waveform diagram of the wideband BPF 10 and the narrowband BPF 11 in FIG.

* Explanation of symbols for main parts of the drawings

100: comb filter circuit 200: band pass filter unit

300: correlation data detector 400: correlation coefficient generator

500: second MUX 600: luminance separation unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a luminance and color signal separation circuit in an image processing system, and more particularly to a circuit for separating luminance and color signals by adaptively filtering according to a correlation between horizontal and vertical pixels.

In the current color television, it is essential to separate the input video signal into the color signal of the luminance signal, and this process is usually performed as a comb filter.

Especially in digital color television such as ID (Improved Definition) televisions and ED (Extended Definition) televisions, which require high image quality, more efficient separation of luminance signals and color signals is required.

On the other hand, the comb filter has to be inverted in phase every one horizontal scanning period when the color signal of the composite video signal is vertically correlated.

In other words, the interleaving of the composite video signal in the NTSC method. In addition, the color signals before and after the horizontal horizontal syringe (1H) should be similar. However, when the comb filter is applied to a portion having no vertical correlation, an error occurs in a portion out of phase, causing a quality deterioration factor called a hanging dot.

There is a need for a vertical and horizontally correlated color signal detection circuit to eliminate such deterioration days.

FIG. 1 is a conventional color signal separation circuit diagram in which FIG. 1 (a) is a vertical correlation color signal separation circuit diagram and FIG. 1 (b) is a horizontal correlation color signal separation circuit diagram. When the video signal V is input through the first input terminal P1 in FIG. 1A, the 1H delay is output from the first 1H delay unit A1. The video signal V _H delayed by 1H in the first 1H delay unit A1 is input to the second 1H delay unit A2, and outputs the video signal V _HH delayed by 1H and 2H delayed again.

In addition, the first 1/2 amplifier A3 for inputting the image signal V input through the first input terminal P1 reduces the level of the image signal to 1/2 and outputs it. The second 1/2 amplifier A4 inputting the 1H delayed video signal V _H from the first 1H delay unit A1 reduces and outputs the level of the video signal to 1/2.

The third 1/2 amplifier A5, which inputs the video signal V _HH delayed by 2H from the second 1H delay unit A2, reduces the level of the video signal by 1/2 and outputs it. In this case, the video signal output from the first 1/2 amplifier A3 is Y1 + C1, the video signal output from the second 1/2 amplifier A4 is Y2-C2, and the third 1/2 amplifier A5. ) Is Y3 + C3.

In this way, the color signal phase of the video signal before and after 1H is inverted in the NTSC system video signal. Therefore, the color signal phase of the composite video signal V input through the first input terminal P1 and the color signal phase of the video signal V _H delayed by 1H in the first 1H delay unit A1 are inverted with each other. 1 The color signal of the video signal V _H delayed by 1H in the 1H delay unit A1 and the video signal V _HH delayed in the second 1H delay unit A2 is inverted.

Accordingly, the video signal Y1 + C1 whose level is reduced by 1/2 in the first 1/2 amplifier A3 and the level whose half level is reduced by the second 1/2 amplifier A4 are reduced in the video signal Y2-. The first subtractor A6 respectively inputting C2) subtracts the two input signals and outputs the subtracted video signals Y1-Y2 + C1 + C2.

Inputting a video signal Y2-C2 that is half reduced in the second 1/2 amplifier A4 and a video signal Y3 + C3 that is half reduced in the 3 1/2 amplifier A4 The second subtractor A7 subtracts the two input signals and outputs the subtracted video signal Y2-Y3-C2-C3.

Input the half-reduced video signal Y1 + C1 and the half-reduced video signal Y2-C2 to the first 1/2 amplifier A3, respectively. The first adder A8 adds the two input signals and outputs the added image signal Y1 + Y2 + C1-C2. Inputting a video signal Y2-C2 that is half reduced in the second 1/2 amplifier A4 and a video signal Y3 + C3 that is half reduced in the third 1/2 amplifier A4 The second adder A9 adds the two input signals and outputs the added image signal Y2 + Y3-C2 + C3. The first BPF A10, which inputs the video signals Y 1-Y + C 1-C 2 added by the first adder A 8, band-passes and outputs the color signals C 1 -C 2. The second BPF A11 inputs the image signal Y2 + Y3-C2 + C3 added by the second adder A9 and filters the band to output the color signal C3-C2.

The first LPF A12 inputs the video signal Y1-Y2 + C1 + C2 subtracted and output from the first subtractor A6 to low-pass filter and outputs the luminance signals Y1-Y2.

The second LPF A13, which inputs the video signal Y2-Y3-C2-C3 subtracted and output from the second subtractor A7, performs low pass filtering to output the luminance signals Y2-Y3. Color signals C1-C2 and C3-C2 band-filtered by the 1-2 BPF (A10-A11) and the luminance signals Y1-Y2, Y2 low-pass filtered by the 1-2 LPF (A12-A13). A correlation detector A14 for inputting -Y3, respectively, detects a correlation in accordance with input states of the luminance signals Y1-Y2, Y2-Y3 and the color signals C1-C2, C3-C2 and selects a predetermined logic. The signal is output to the signal selection terminal S of the MUX A17.

On the other hand, the first delay compensator A15, which inputs the subtracted output image signal Y1-Y2 + C1 + C2 from the first subtractor A6, is connected to the luminance signal or the color signal inputted by the correlation detector A14. The output is delayed to finish the timing.

The second delay compensator A16 for inputting the composite video signal Y2-Y3-C2-C3 subtracted and output from the second detector A7 may include a luminance signal or a color signal input to the correlation detector A14. To delay the timing output.

The MUX A17 which inputs the video signals output from the 1-2 delay compensators A15 to A16 respectively selects and outputs one of the two input signals according to the correlation detected by the correlation detector A14. . The third BPF A18, which inputs the signal output from the MUX 17, band-passes and outputs a pure color signal.

The circuit of FIG. 1 (a) can easily detect the low frequency component of the luminance signal, which may be an important criterion for correlation detection, but the characteristics of the band pass filter applied to detect the difference between the color signal components are very sharp ( Hardware, which is complex.

In addition, since the band pass filter has a very narrow band, the order is increased, which means that the width of the surrounding pixel of the processing pixel to be applied is increased. In addition, since the correlation of band pass filter does not hold in the horizontal transition of the composite video signal, dot crawl occurs and error detection by the band pass filter occurs in the transition of luminance signal. Cross colors will occur.

Referring to the operation of the horizontally correlated color signal separation circuit of FIG. 1 (b) to solve the above disadvantages, 2 in the first 2D delay unit B1 for inputting the image signal V _1D through the second input terminal P2. Pixel delay output. The two-pixel delayed signal V _3D of the first 2D delayer B1 is input to the second 2D delayer B2 to output a four-pixel delayed video signal V _5D .

In addition, the first 1/2 amplifier B3 for inputting the image signal V _1D input through the second input terminal P2 reduces and outputs the level of the image signal to 1/2. The second 1/2 B4, which inputs the video signal V _3D delayed by two pixels in the first 2D delay unit B1, reduces the level of the video signal to 1/2 and outputs it. The third 1/2 amplifier B5, which inputs the 4-pixel delayed video signal V _5D from the second 2D delayer B2, reduces the level of the video signal by 1/2 and outputs it.

Accordingly, the first adder B6 for inputting the image signal 1/2 reduced in the first 1/2 amplifier B3 and the image signal 1/2 reduced in the second 1/2 amplifier B4 may be used. Two input signals are added and output. The second adder B7 for inputting the video signal half reduced in the second half amplifier B4 and the video signal signal half reduced in the third half amplifier A4 is the two. The input signal is added and output. The first subtractor B8 for inputting the video signal 1/2 reduced in the first 1/2 amplifier B3 and the video signal 1/2 reduced in the second 1/2 amplifier B4 are the two subtractors. Subtract the input signal and output it.

The second subtractor B9 for inputting the image signal 1/2 reduced in the second 1/2 amplifier B4 and the image signal 1/2 reduced in the third 1/2 amplifier B4 is the two inputs. Subtract the signal and output it.

The first BPF B10, which inputs the video signal added by the first adder B6, band-passes and outputs a first color signal. The second BPF B11, which inputs the video signal added by the second adder B7, band-passes and outputs a second color signal.

The correlation detector B12 for inputting the first-second color signal band-filtered by the first-second BPF (B10-B11) detects the correlation in accordance with the input state of the first-second color signal and selects a predetermined logic selection signal. The signal is output to the signal selection terminal S of the MUX B15. On the other hand, the first delay compensator B15 for inputting the subtracted output image signal from the first subtractor B8 outputs the delayed signal to match the color signal inputted to the correlation detector B12.

The second delay compensator B14 inputting the subtracted image signal from the second subtractor B9 outputs a delay to match the timing of the color signal input to the correlation detector B14.

The MUX B15 that inputs the video signals output from the 1-2 delay compensators B13 to B14 respectively selects and outputs one of the two input signals according to the correlation detected by the correlation detector B12. The third BPF B16, which inputs the signal output from the MUX B15, filters the band to output a pure color signal. At this time, the transition of the color signal is generated as shown in FIG.

As described above, the conventional horizontal correlation color separation circuit of FIG. 1 (b) has an effect of reducing dot crawl and cross color by filtering according to the correlation between the horizontal lines. There was a problem in that it was not possible to accurately detect at each pixel when the color signal transitioned because it did not cope with the interference.

Accordingly, an object of the present invention is to provide a circuit for adaptively separating a luminance signal and a color signal in accordance with a correlation between horizontal and vertical rotations.

Another object of the present invention is to provide a circuit for accurately detecting the transition of the color signal at each pixel to separate the luminance signal and the color signal.

It is still another object of the present invention to provide a circuit for separating the luminance signal and the color signal from which dot scroll or cross color is not generated by combing according to the correlation between the horizontal lines.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 3 is a circuit diagram according to the present invention, and outputs the first and second 1H comb data by 1H com-filtering the video signals V of three consecutive horizontal scanning lines, respectively, and the 1H delayed video signal V _H and the 2H delay. Comb filter circuit 100 for outputting the video signal (V _HH ) and the 1H delayed video signal (V _H ) output from the comb filter circuit 100 by band pass filtering to output a wideband color signal and a narrowband color signal, respectively The first to fourth correlation data by inputting the band pass filter unit 200, the image signal V and the 2H delayed image signal V outputted from the comb filter circuit 100, the wideband color signal and the narrowband color signal. A correlation coefficient detection unit 300 for detecting a correlation coefficient, a correlation coefficient generation unit 400 for generating a correlation coefficient by inputting first-fourth correlation data output from the correlation data detection unit 300, and the comb filter circuit ( Comb-filtered signal of 100 and the narrowband output from the bandpass filter unit 200 The 1H delayed video signal (V output from and to the input signal and a wide color signal the correlation coefficient generator MUX (500) outputs a color signal to apply ever in accordance with the correlation output of 300, the comb filter circuit 100 _H ) is composed of a luminance separator 600 for removing the luminance signal by removing the color signal output from the second MUX (500).

)에서 상기 제2 1/2증폭기(4)의 1/2증폭된 영상신호(

)를 감산하는 제3감산기(8)와, 상기 제2 1/2증폭기(4)의 1/2증폭된 영상신호(

)에서 제3 1/2증폭기(5)의 1/2증폭된 영상신호(

)를 감산하는 제4감산기(9)와, 상기 제3-4감산기(8,9)에서 감산된 신호를 각각 소정시간 지연시켜 출력하는 제1-2지연보상부(25,26)로 구성되고, 상기 밴드패스필터(200)는 상기 제1 1H지연기(1)에서 1H지연된 영상신호(V_H)를 대역 여파하여 광대역 색신호를 출력하는 광대역 BPF(10)와, 상기 제1 1H지연기(1)에서 1H지연된 영상신호(V_H)를 대역여파하여 협대역 색신호를 출력하는 협대역 BPF(11)로 구성되며, 상기 상관 데이타 검출부(300)는 상기 제1 1/2증폭기(3)의 1/2증폭된 영상신호(

)에서 상기 제3 1/2증폭기(5)의 1/2증폭된 영상신호(

)를 감산하는 제1감산기(6)와, 상기 광대역 BPF(10)의 출력인 광대역 색신호에서 상기 협대역 BPF(11)의 출력인 협대역 색신호를 감산하는 제2감산기(7)와, 상기 제3감산기(8)의 출력신호를 저역여파하여 제1휘도신호를 출력하는 제1LPF(Low Pass Filter)(12)와, 상기 제4감산기(9)의 출력신호를 저역 여파하여 제2휘도신호를 출력하는 제2LPF(13)와, 상기 제1-2감산기(6,7)의 각각 출력에 대한 절대값을 취하여 제1-2상관 데이타를 출력하는 제1-2ABS(14,15)와, 상기 제1-2LPF(12,13)의 각각 출력에 대한 절대값은 취하여 제3-4상관 데이타를 출력하는 제3-4ABS(16,17)로 구성되고, 상관계수 발생부(400)는 상기 제3-4ABS(16,17)에서 절대값을 취한 제3-4상관 데이타를 비교하여 작은 상관 데이타를 검출하는 최소치 검출부(18)와, 상기 제3ABS(16)의 출력단에 입력단자(A)가 접속되고 상기 제4ABS(17)의 출력단에 입력단자(B)가 접속되어 상기 제3-4상관 데이타를 비교하여 비교결과를 출력하는 제1비교기(19)와, 상기 최소치 검출부(18)의 출력단에 입력단자(A)가 접속되어 제1기준데이타 입력단자에 입력단자(B)가 접속되어 상기 최소치검출부(18)에서 검출된 상관 데이타와 제1기준데이타를 비교하여 비교결과를 출력하는 제2비교기(20)와, 상기 제2ABS(15)의 출력단에 입력단자(A)가 접속되고 제2기준데이타 입력단자가 입력단자(B)에 접속되어 상기 제2상관 데이타와 제2기준데이타를 비교하여 비교결과를 출력하는 제3비교기(21)와, 상기 제1 ABS(15)의 출력단에 입력단자(A)가 접속되고 제3기준데이타 입력단자가 입력단자(B)에 접속되어 상기 제1상관 데이타와 제3기준데이타를 비교하여 비교결과를 출력하는 제4비교기(22)와, 상기 제2-4비교기(20,22)의 출력단에 각각 입력단이 접속되는 오아게이트(23)와, 상기 제1,제3비교기(19,21)의 출력신호를 입력하여 상기 오아게이트(23)의 출력신호에 의해 상관계수를 결정하기 위한 제1 MUX(24)로 구성되며, 상기 휘도분리부(600)는 상기 제1 1H지연기(1)의 출력인 1H지연 영상신호(V_H)를 소정지연 출력하는 제5지연보상기(29)와, 상기 제5지연보상기(29)에서 소정 지연된 영상신호에서 상기 MUX(500)에서 출력된 색신호를 감산하는 제5감산기(30)로 구성된다.The configuration comb filter circuit 100 of the video signal (V) to the first 1H delay device (1) and, 1H delayed video signal (V _H) in the first one 1H delay device (1) by an output delay 1H A second 1H delayer 2 which inputs and delays 1H again to output 2H delayed video signal V _HH , and a first 1/2 amplifier 3 which amplifies and outputs video signal V 1/2 and A second 1/2 amplifier 4 for amplifying and outputting the video signal V _H delayed by 1H in the first 1H delayer 1 and outputting 2H in the second 1H delayer 2; A third half amplifier 5 for amplifying and outputting the image signal V _HH 1/2 and a half amplified image signal of the first half amplifier 3 (

Video signal amplified by 1/2 of the second 1/2 amplifier 4

Subtracted by the third subtractor 8 and the second half amplifier of the second half amplifier 4

Video signal amplified by the 1/2 of the third 1/2 amplifier (5)

A subtractor (25, 26) for subtracting the subtracted by the fourth subtractor (9) and the third subtractor (8, 9) and outputs the delayed signal by a predetermined time, respectively; The band pass filter 200 is a wideband BPF (10) for outputting a wideband color signal by band-filtering the video signal (V _H ) delayed by the 1H in the first 1H delay unit 1, and the first 1H delay unit ( 1) in the 1H delayed video signal (V a wake _H) band is composed of a narrow band BPF (11) for outputting the narrow-band color signal, the correlation data detection unit 300 of the first half-amplifier 3 1/2 amplified video signal (

Video signal amplified by 1/2 of the third 1/2 amplifier 5

A first subtractor 6 for subtracting N), a second subtractor 7 for subtracting a narrowband color signal that is an output of the narrowband BPF 11 from a wideband color signal that is an output of the wideband BPF 10, and the second subtractor 7; The first LPF 12 outputs the first luminance signal by low-pass filtering the output signal of the three subtractors 8, and the second luminance signal by low-pass filtering the output signal of the fourth subtractor 9. Outputting the second LPF 13 and the first and second subtractors 6 and 7, respectively, and outputting the first and second correlation data, respectively; The absolute value of each of the outputs of the first-2LPFs 12 and 13 is composed of the third and fourth ABSs 16 and 17 which output the third and fourth correlation data. The minimum value detection unit 18 which compares the 3-4 correlation data which take the absolute value in 3-4ABS (16,17), and detects small correlation data, and the input terminal A is connected to the output terminal of the 3ABS16. Connected to the fourth ABS 17 An input terminal B is connected to an output terminal, and a first comparator 19 for comparing the 3-4 correlation data and outputting a comparison result, and an input terminal A is connected to an output terminal of the minimum value detector 18. A second comparator 20 which connects an input terminal B to a first reference data input terminal and compares the correlation data detected by the minimum value detector 18 with the first reference data and outputs a comparison result, and the second ABS A third comparator for connecting the input terminal A to the output terminal of (15) and the second reference data input terminal to the input terminal B to compare the second correlation data with the second reference data and output a comparison result. An input terminal A is connected to an output terminal of the first ABS 15 and a third reference data input terminal is connected to an input terminal B to compare the first correlation data with the third reference data. To the output terminals of the fourth comparator 22 and the second to fourth comparators 20 and 22 for outputting a comparison result. A first MUX (for determining the correlation coefficient based on an output signal of the oragate 23 by inputting an oragate 23 to which an input terminal is connected and output signals of the first and third comparators 19 and 21). And a fifth delay compensator 29 configured to output a predetermined delay of the 1H delayed image signal V _H , which is the output of the first 1H delayer 1, and the fifth delay compensator 29. And a fifth subtractor 30 which subtracts the color signal output from the MUX 500 from the image signal delayed by the fifth delay compensator 29.

4 is an output waveform diagram of the band pass filters 10 and 11 of FIG.

Based on the above-described configuration, an embodiment of the present invention will be described in detail with reference to FIGS. 4-5. When the video signal V is input through the input terminal P11, a 1H delay is output to the first 1H delay unit 1.

The video signal VH delayed by 1H in the first 1H delayer 1 is input to the second 1H delayer 2 and outputs a video signal VHH delayed by 1H and 2H delayed again. In addition, the first 1/2 amplifier 3 for inputting the video signal V input through the input terminal P11 reduces the level of the video signal to 1/2 and outputs the video signal. The second 1/2 amplifier 4 inputting the 1H delayed video signal VH from the first 1H delayer 1 reduces the level of the video signal to 1/2 and outputs it. The third 1/2 amplifier 5 inputting the 2H delayed video signal VHH from the second 1H delayer 2 reduces and outputs the level of the video signal to 1/2. At this time, the video signal output from the first 1/2 amplifier 3 is Y1 + C1 and the video signal output from the second 1/2 amplifier 4 is Y2-C2 and the third 1/2 amplifier 5 ) Is Y3 + C3. Here, in the NTSC video signal, the color signal phase of the video signal before and after 1H is reversed. Therefore, the color signal of the image signal V input through the input terminal P11 and the image signal VH and the color signal phase delayed by 1H in the first 1H delay unit 1 are inverted from each other and the first 1H delay unit is inverted. The color signal phases of the video signal VH delayed by 1H in (1) and the video signal VHH delayed by 2H in the second 1H delay unit 2 are also inverted.

Therefore, the video signal Y1 + C1 of which the level is reduced by 1/2 in the first 1/2 amplifier 3 is reduced by the level of 1/2 which is reduced by the level of the second 1/2 amplifier 4. The third subtractor 8 subtracting C2) outputs the subtracted zero signal Y1-Y2 + C1 + C2. The image signal Y3 + having the level reduced by 1/2 in the third 1/2 amplifier 5 in the image signal Y2-C2 whose level is reduced by 1/2 in the second 1/2 amplifier 4 The fourth subtractor 9 subtracting C3) outputs the subtracted video signal Y2-Y3-C2-C3. The signals subtracted by the fourth subtractors 8 and 9 are applied to the first-second delay compensators 25 and 26 and output by a predetermined delay from the first-second delay compensators 25 and 26, respectively.

In addition, the wideband BPF 10 inputting the 1H delayed video signal V _H of the first 1H delayer 1 outputs a wideband color signal as shown in FIG. 4A by performing a band pass filtering. The wideband BPF 11 inputting the 1H delayed video signal V _H of the first 1H delay unit 1 outputs narrowband color signals as shown in FIG. 4B by performing bandpass filtering. The wideband color signal that is the output of the wideband BPF 10 and the narrowband color signal that is the output of the narrowband BPF 11 are output by a predetermined delay from the third to fourth delay compensators 27 and 28, respectively. Image signal Y3 + C3 whose level is reduced by 1/2 in the third 1/2 amplifier 5 in the image signal Y1 + C1 whose level is reduced by 1/2 in the first 1/2 amplifier 1 Subtracter 6 outputs the subtracted video signal Y1-C1 + C3-C3. The first ABS 14, which inputs the video signal subtracted by the first subtractor 6, takes an absolute value and outputs first correlation data. A second subtractor 7 for inputting a wideband color signal output from the wideband BPF 10 and a narrowband color signal output from the narrowband BPF 11 respectively outputs a subtracted color signal by subtracting the two input signals. The second ABS 15, which inputs the color signal subtracted by the second subtractor 7, takes an absolute value and outputs second correlation data. The first and second LPFs 12 and 13, which input the subtracted and output image signals from the third and fourth subtractors 8 and 9, respectively perform low pass filtering to detect low-pass transitions of luminance signals generated in two lines. To print. The 3-4ABS (16, 17) inputting the luminance signal and the low-pass transition value respectively detected by the 1-2LPF (12, 13) takes an absolute value and outputs the 3-4 correlation data. In this case, the first correlation data is for detecting the exact correlation between the luminance and the color signal, the second correlation data is for detecting the correlation between the horizontal color signals, and the third and fourth correlation data are for detecting the correlation between the luminance signals. It is for.

Therefore, when the first-fourth correlation data output from the first-fourth ABSs 14 and 17 is smaller, the correlation is higher, and when the first-fourth correlation data is large, a transition occurs. The degree becomes small.

The third correlation data output from the third ABS 16 is input to an input terminal A of the first comparator 19 and one input terminal of the minimum value detector 18 and output from the fourth ABS 17. The correlation data is input to the input terminal B of the first comparator 19 and the other input terminal of the minimum value detector 18.

As a result, the minimum value detector 18 compares the third to fourth correlation data and outputs small data, that is, high correlation data. The highly correlated data output from the minimum detector 18 is input to the second comparator 20 and the input terminal A, and the first reference data for measuring the correlation level is input to the second comparator 20. It is input to the terminal B.

The second correlation data output from the second ABS 15 is input to the input terminal A of the third comparator 21, and the second reference data REF3 for measuring the correlation level is the third comparator. It is input to the input terminal B of (21). The first correlation data output from the first ABS 14 is input to the input terminal of the fourth comparator 22, and the third reference data REF3 for measuring the correlation level is input to the fourth comparator 22. It is input to the terminal B.

In addition, the output signals of the second and fourth comparators 20 and 22 are input to the input terminals of the oragate 23, respectively, and the output signals of the orgake 23 are the first MUX 24 and the second MUX 500. It is input to the selection terminal s of). The output signal of the first comparator 19 is input to the second input terminal B of the first MUX 24, and the output signal of the third comparator 21 is the first input terminal of the first MUX 24. It is entered as (A). Accordingly, the first MUX 24 selects the signal input to the first input terminal A when ″ 1 ″ is input to the selection terminal s and inputs to the second input terminal B when ″ 0 ″ is input. The selected signal will be selected.

In this case, the first correlation data input to the input terminal A of the fourth comparator 22 is larger than the third reference data REF3 input to the input terminal B of the fourth comparator 22 or the third correlation data. When the first reference data REF1 input to the input terminal B of the second comparator 20 is larger than the first reference data REF1, the output of the second comparator 20 or the fourth comparator 22 becomes ″ 1 ″. When the output of the second comparator 20 or the fourth comparator 22 becomes ″ 1 ″, the output of the oragate 23 also becomes ″ 1 ″. The output of the oragate 23 is applied to the selection terminal S of the first MUX 24 and the second MUX 500. In this case, when the second correlation data input to the input terminal A of the third comparator 21 is larger than the second reference data REF2 input to the input terminal B, the output of the third comparator 21 is output. This state is ″ 1 ″.

Accordingly, the first MUX 24 outputs a ″ 1 ″ state through an output terminal, and a 2-bit selection data ″ 11 ″ state is applied to the selection terminal s of the second MUX 500. Therefore, the second MUX 500 selectively outputs the narrowband color signal output from the fourth delay compensator 28.

However, when the second correlation data input to the input terminal A of the third comparator 21 is smaller than the second reference data REF2 input to the input terminal B, the output of the third comparator 21 is output. The state is ″ 0 ″. Accordingly, the first MUX 24 outputs a ″ 0 ″ state through an output terminal, and a 2-bit selection data 10 state is applied to the selection terminal s of the second MUX 500. Therefore, the second MUX 500 selects and outputs the wideband color signal output from the third delay compensator 28.

Also, the first correlation data input to the input terminal A of the fourth comparator 22 is smaller than the third reference data REF3 input to the input terminal B of the fourth comparator 22 or the third correlation data. When the data having a small correlation between the luminance signals input to the input terminal A of the second comparator 20 is smaller than the first reference data REF1 input to the input terminal B of the second comparator 20, The output of the second comparator 20 or the fourth comparator 22 is in a " 0 " state. When the output of the second comparator 20 or the fourth comparator 22 is in the ″ 0 ″ state, the output of the oragate 23 is also in the ″ 0 ″ state. Therefore, the ″ 0 ″ state signal output from the oragate 23 is applied to the selection terminal S of the first MUX 24 and the second MUX 500. At this time, when the third correlation data input to the input terminal A of the first comparator 19 is larger than the fourth correlation data input to the input terminal B, the output of the third comparator 21 is ″ 1. Is in the state ″.

Accordingly, the first MUX 24 outputs a ″ 1 ″ state through an output terminal, and a 2-bit selection data ″ 01 ″ state is applied to the selection terminal s of the second MUX 500. Therefore, the second MUX 500 selectively outputs the 1 H com filtered color signal output from the second delay compensator 26.

However, when the third correlation denyta input to the input terminal A of the first comparator 19 is smaller than the fourth correlation data input to the input terminal B, the output of the third comparator 21 is ″ 0. Is in the state ″. Accordingly, the first MUX 24 outputs a ″ 0 ″ state through an output terminal, and a 2-bit selection data ″ 00 ″ state is applied to the selection terminal s of the second MUX 500. Therefore, the second MUX 500 selects and outputs the 1H comb filtered color signal output from the first delay compensator 25.

Meanwhile, the luminance signal is separated as follows. The 1H delayed video signal VH in the first 1H delayer 1 is delayed by the fifth delay compensator 29 to be output in synchronization with the color signal selected and output from the second MUX 500.

The fifth subtractor 30, which inputs the image signal delayed by the fifth delay compensator 29 and the color signal output from the second MUX 500, subtracts the color signal from the delayed image signal to separate and output the luminance signal. do. Also, in FIG. 4, when the wideband BPF 10 and the narrowband BPF 11 are changed to LPF, and the third to fourth subtractors 8 and 9 are respectively changed to adders, they are separated from the second MUX 500. The luminance signal is output.

As described above, it is possible to prevent the occurrence of dot crawl or cross color by adaptively separating luminance and color signals according to the correlation between the horizontal direction and the vertical direction, and to accurately detect the color signal transition in each pixel. There is an advantage to that.

Claims (2)

In the vertical and horizontally correlated adaptive luminance signal and color signal separation circuit of the image processing system, the first and second 1H comb data are output by 1H comb filtering of the video signals V of three consecutive horizontal scanning lines, respectively. Broadband color signal by bandpass filtering the comb filter circuit 100 for outputting the delayed video signal VH and the 2H delayed video signal VHH, respectively, and the 1H delayed video signal VH output from the comb filter circuit 100. And a band pass filter unit 200 for outputting a narrowband color signal, and a composite video signal V and a second H delayed shape signal VHH outputted from the comb filter circuit 100, a wideband color signal and a narrowband color signal, respectively. A correlation data detector 300 for inputting and detecting the 1-4 correlation data, and a correlation coefficient generator 400 for generating the correlation coefficient by inputting the 1-4 correlation data output from the correlation data detection unit 300. And comb filtering of the comb filter circuit 100. A MUX 500 for inputting the received signal and the narrowband color signal and the wideband color signal output from the bandpass filter unit 200 to output the color signal according to the correlation coefficient output of the correlation coefficient generator 300; The luminance signal is separated by removing the color signal outputted from the second MUX 500 from the delayed compensation of the 1H delayed image signal V _H output from the comb filter circuit 100 by the fifth delay compensator 29. A circuit comprising a luminance signal unit 600. In the vertical and horizontally correlated adaptive color signal separation circuit of an image processing system, 1H comb filtering of the video signal V of each new continuous horizontal scanning line is performed to output first and second 1H comb data, and 1H delay. The comb filter circuit 100 for outputting the video signal VH and the 2H delayed video signal VHH, respectively, and the 1H delayed video signal VH output from the comb filter circuit 100 by bandpass filtering a wideband color signal and A band pass filter unit 200 for outputting a narrow band color signal, a composite image signal V and a 2H delayed image signal VHH output from the comb filter circuit 100, a wideband color signal, and a narrow band color signal Correlation coefficient generating unit 400 and comb filtering of the comb filter circuit 100 generating the correlation coefficient by inputting the 1-4 correlation data output from the correlation data detection unit 300 for detecting the 1-4 correlation data. The output signal and the band pass filter unit 200 By entering a narrow band color signal and a broadband color signal circuit, characterized in that it consists of a MUX (500) for outputting a color signal adaptively in accordance with the correlation output of the correlation coefficient generator 300.

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