KR100238801B1 - Method for separating luminance and chroma signals from composite video signal and separation circuit for performing the same - Google Patents

Abstract

A luminance and color signal separation circuit for separating a luminance signal and a color signal from a composite video signal is disclosed. The composite video signal is separated into a first luminance signal and a second color signal. The first luminance signal is separated into a second luminance signal and a second color signal, and the first color signal is separated into a third luminance signal and a third color signal. The first luminance signal is added by adding the second luminance signal and the third luminance signal, and the second operational luminance signal is output by adding the first operational luminance signal and the third color signal. The first operation color signal is added by adding the second color signal and the third color signal, and the second operation color signal is output by adding the first operation color signal and the third luminance signal. A 3.58 MHz frequency component is detected from the first luminance signal and the first color signal to generate a control signal. In response to the control signal, one of a second luminance signal, a first operational luminance signal, and a second operational luminance signal is selected and output as a final luminance signal, and a second color signal, a first operational color signal, and a second operation are output. Any one of the color signals is selected and output as the final color signal. The luminance signal and the color signal are separated according to the detected 3.58 MHz frequency component to remove crosstalk between the luminance signal and the color signal, thereby increasing the separation of the luminance and color signals of the composite image signal.

Description

A luminance and color signal separation method and a luminance and color signal separation circuit for performing the same

The present invention relates to a luminance and color signal separation method of a television receiver and a luminance and color signal separation circuit for performing the same. More specifically, the present invention provides a method for separating luminance and color signals for sensing the 3.58 MHz component of the luminance signal and the 3.58 MHz carrier component of the color signal and controlling the 3.58 MHz component carried on the luminance signal and the color signal, and performing the same. It relates to a luminance and color signal separation circuit for.

In general, the human eye is known that color information such as hue and saturation does not need to be as detailed as the information necessary for luminance in the image quality and image of the same sharpness. Therefore, the largest frequency band is allocated to the luminance signal in the frequency band of the television. On the other hand, for hue and saturation that do not correspond to the amount of change in luminance, the human eye should have 1/10 to 1/3 of the resolution required for brightness.

Color signals modulated as color subcarriers due to the above properties are put in a band much narrower than the luminance signal band. For example, in the NTSC system, an I signal component of a color signal modulated as a color subcarrier uses a 1.3 MHz band, and a Q signal component uses a 0.5 MHz band. Providing a wider band for the I signal component compared to the Q signal component of the color signal is because the I signal is better for color resolution.

Since the frequency of the color carrier is 3.58 MHz, the modulated color signal is interleaved on the high frequency sideband of the luminance signal to generate a composite image signal. When the luminance signal and the color signal interleaved to the luminance signal are separated from the composite image signal, a comb filtering method is used to minimize the attenuation of the luminance signal and the interference by the luminance signal of the color signal.

FIG. 1 is a block diagram showing the structure of a conventional comb filter, which is composed of a 3 MHz low pass filter 13, a subtractor 15, a comb filter 17, and an adder 19. The low pass filter 13 passes only the composite video signal 14 in the frequency range of 3 MHz or less from the composite video signal 12 input from the input terminal 11 to pass the low pass composite video signal 14. The subtractor 15 is provided. The composite video signal passing through the low pass filter 13 is a frequency signal of only the luminance signal component.

The subtractor 15 subtracts a frequency signal of only a luminance component in a frequency range of 3 MHz or less input from the low pass filter 13 from the composite video signal 12 input from the input terminal 11 to display luminance and luminance. A composite video signal of 3 MHz or more in which color signals are interleaved is generated, and the generated composite video signal 16 of 3 MHz or more is provided to the comb filter 17. The comb filter 17 generates a color signal C and a luminance signal 18 of 3 MHz or more by com-filtering the interleaved composite video signal of 3 MHz or more, and outputs the generated color signal, while outputting the generated color signal. A luminance signal 18 is provided to the adder 19. Then, the adder 19 adds the luminance signal 14 from the low pass filter 13 and the luminance signal from the comb filter 17 to produce an original luminance signal Y having a high luminance component. Will generate and print it.

However, in the operation of the comb filter, the vertical phase relationship between the luminance signal and the color signal has a high degree of vertical correlation, for example, in the image having no change between lines, without high crosstalk for the luminance signal of the color signal. The luminance signal of the frequency band can be saved, but if the image is a video, the vertical correlation of the image deviates. Therefore, in this case, the luminance signal output from the comb filter results in a high frequency component of the luminance signal flowing into the color signal component, resulting in a crosstalk phenomenon.

FIG. 2 is a block diagram 20 showing a conventional 1H comb filter, which is composed of a delayer 23, an adder 25, and a subtractor 26.

The composite video signal 22 input from the input terminal 21 is input to the delay unit 23 and the first adder 25. The delayer 23 delays the input composite video signal by 1H, and then outputs the composite video signal delayed by 1H to the adder 25 and the subtractor 26.

The adder 25 outputs a luminance signal Y obtained by adding up the composite video signal 22 input from the input terminal 21 and the 1H delayed composite video signal 24 output from the delayer 23. Outputs through the terminal.

The subtractor 26 outputs a color signal C by subtracting the composite video signal 22 input from the input terminal 21 from the 1H delayed composite video signal 24 output from the delayer 23. Outputs through the terminal.

Some crosstalk phenomena occur even when the luminance and color signals are separated by the conventional comb filter and the 1H comb filter shown in FIGS. The image quality deterioration phenomenon caused by the crosstalk phenomenon caused by the incomplete luminance and color signal separation causes the phenomenon of a hanging dot for an image having a change in the vertical direction.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a first object of the present invention is to improve luminance and color in order to prevent color signals from being incorporated into luminance signals when separating luminance and color signals from a composite video signal. It is to provide a signal separation method.

It is a second object of the present invention to provide a luminance and color separation circuit which is particularly suitable for performing the above-described luminance and color signal separation method.

1 is a block diagram showing the configuration of a conventional comb filter.

Fig. 2 is a block diagram showing a typical 1H comb filter.

3 is a block diagram illustrating a luminance and color signal separation circuit according to an exemplary embodiment of the present invention.

4 is a flowchart illustrating a method of separating luminance and color signals according to an embodiment of the present invention using the luminance and color signal separation circuit shown in FIG. 3.

FIG. 5 is a diagram illustrating a spectrum of each part of FIG. 3.

* Description of the symbols for the main parts of the drawings *

13: 3 MHz low pass filter 15, 26, 130, 250, 280: subtractor

Adder: 19, 25, 120, 240, 270, 330, 340, 350, 360

17: comb filter 23, 230, 260: 1H delay

110: 2H delayer 410, 420: 3.58 MHz detector

510: controller 610, 620: switch

In order to realize the first object of the present invention, the present invention

(a) processing a composite video signal input through an input terminal to separate a first luminance signal including a color signal component and a first color signal including a luminance signal component;

(b) a second luminance signal and a second color signal are separated from the first luminance signal separated by step (a), and a third luminance signal and a second luminance signal are separated from the first color signal separated by step (a). Separating into three color signals;

(c) calculating the second luminance signal, the second color signal, the third luminance signal, and the third color signal separated by step (a), to thereby calculate the first and second operational luminance signals and the first and second operational colors. Generating a signal;

(d) detecting a 3.58 MHz frequency component from the first luminance signal and the first color signal separated by step (a);

(e) generating a control signal in response to the 3.58 MHz frequency component values of the first luminance signal and the first color signal detected by step (d); And

(f) In response to the control signal generated by step (e), one of the second luminance signal, the first operational luminance signal, and the second operational luminance signal is selected and output as a final luminance signal, and the second color A luminance and color signal separation method comprising selecting one of a signal, a first arithmetic color signal, and a second arithmetic color signal and outputting the selected color signal as a final color signal is provided.

In order to realize the above-mentioned second object of the present invention, according to the present invention,

A first image separator for processing a composite image signal input through an input terminal to separate a first luminance signal including a color signal component and a first color signal including a luminance signal component;

A second image for processing the first luminance signal separated from the image separator to separate the second luminance signal and the second color signal, and processing the first color signal to separate the third luminance signal and the third color signal Separator;

A second luminance signal, a second color signal, a third luminance signal, and a third color signal separated from the second image separator are calculated to output first and second arithmetic luminance signals and first and second arithmetic color signals. A signal calculator for performing;

A 3.58 MHz detector for detecting a 3.58 MHz frequency component from the first luminance signal and the first color signal from the first image separator;

A control unit for generating a control signal in response to the 3.58 MHz frequency component values of the first luminance signal and the first color signal from the 3.58 MHz detection unit; And

In response to the control signal from the controller, one of the second luminance signal, the first operational luminance signal, and the second operational luminance signal is selected and output as a final luminance signal, and the second color signal and the first operation A luminance and color signal separation circuit is provided, which comprises an output section for selecting any one of a color signal and a second arithmetic color signal and outputting it as a final color signal.

According to the present invention, the composite video signal input through the input terminal is separated into a first luminance signal comprising a color signal component and a second color signal comprising a luminance signal component. The first luminance is separated into a second luminance signal and a second color signal, and the first color signal is separated into a third luminance signal and a third color signal. The first luminance signal is added by adding the second luminance signal and the third luminance signal, and the second operational luminance signal is output by adding the first operational luminance signal and the third color signal. The first operation color signal is added by adding the second color signal and the third color signal, and the second operation color signal is output by adding the first operation color signal and the third luminance signal. A 3.58 MHz frequency component is detected from the first luminance signal and the first color signal, and a control signal is generated in response to the detected 3.58 MHz frequency component value of the first luminance signal and the first color signal. In response to the control signal from the controller, one of the second luminance signal, the first operational luminance signal, and the second operational luminance signal is selected and output as a final luminance signal, and the second color signal and the first operation One of the color signal and the second arithmetic color signal is selected and output as the final color signal.

When the luminance and color signals are separated from the input composite video signal, the 3.58MHz frequency component of the luminance signal and the color signal is detected, and the luminance signal and the color signal are separated according to the detected 3.58MHz frequency component to crosstalk between the luminance signal and the color signal. By eliminating H, the separation of the luminance and color signals of the composite video signal is increased.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

3 is a block diagram illustrating a luminance and color signal separation circuit 700 according to an exemplary embodiment of the present invention. The luminance and color signal separation circuit 700 may include a first image separation unit 100, a second image separation unit 200, a signal calculation unit 300, a 3.58 MHz detection unit 400, a control unit 500, and an output unit 600. It is composed of

The first image separator 100 includes a 2H retarder 110, a first adder 120, and a first subtractor 130.

The composite video signal 102 input from the input terminal 101 is input to the 2H delay unit 110, the first adder 120, and the first subtractor 130. The delayer 110 delays the input composite video signal 102 by 2H and outputs the 2H delayed composite video signal 112 to the first adder 120 and the first subtractor 130.

The first adder 120 adds the composite video signal 102 input from the input terminal 101 and the composite video signal 112 delayed by 2H from the 2H delayer 110 to include a color signal component. The first luminance signal B is output to the second image separator 200 and the 3.58 MHz detector 400.

The first subtractor 130 subtracts the composite video signal 112 delayed by the 2H from the 2H delayer 110 from the composite video signal 102 input from the input terminal 101 and includes a luminance signal component. The first color signal A is output to the second image separator 200 and the 3.58 MHz detector 400.

The second image separator 200 includes a luminance signal processor 210 and a color signal processor 220.

The luminance signal processor 210 includes a first 1H retarder 230, a second adder 240, and a second subtractor 250.

The first luminance signal B, which is output from the first adder 120 and includes a color signal component, includes the first 1H retarder 230, the second adder 240, and the first luminance signal of the luminance signal processor 210. 2 is input to the subtractor 250. The first 1H delayer 230 delays the first luminance signal B input from the first adder 120 by 1H, and then transmits the 1H delayed first luminance signal 232 to the second adder 240. And output to the second subtractor 250.

The second adder 240 is formed by adding the first luminance signal B output from the first adder 120 and the first luminance signal 232 delayed by 1H from the first 1H delayer 230. The second luminance signal Y _L , which is a frequency component, is output to the signal calculator 300 and the output unit 600.

The second subtractor 250 subtracts the first luminance signal 232 delayed by the 1H delay from the first 1H delayer 230 from the first luminance signal B output from the first adder 120. The second color signal C _L , which is a frequency component, is output to the signal operation unit 300 and the output unit 600.

The color signal processor 220 includes a second 1H retarder 260, a third adder 270, and a third subtractor 280.

The first color signal A, which is output from the first subtracter 130 and includes the luminance signal component, includes the second 1H retarder 260, the third adder 270, and the first color signal of the color signal processor 220. 3 subtractor 280 is input. The second 1H delayer 260 delays the first color signal A, which is input from the first adder 120 and includes the luminance signal component, by 1H, and then outputs the 1H delayed first color signal 262. Output to the third adder 270 and the third subtractor 280.

The third adder 270 is formed by adding the first color signal A output from the first subtractor 130 and the first color signal 262 delayed by 1H from the second 1H delayer 260. The third luminance signal Y _H , which is a frequency component, is output to the signal calculator 300 and the output unit 600.

The third subtractor 280 is a high frequency frequency obtained by subtracting the first color signal 262 delayed by the 1H delay from the second 1H delayer 260 from the first color signal A output from the first subtractor 130. The third color signal C _H , which is a component, is output to the signal operation unit 300 and the output unit 600.

The signal calculator 300 includes a luminance signal calculator 310 and a color signal calculator 320.

The luminance signal calculator 310 includes a fourth adder 330 and a fifth adder 340.

The fourth adder 330 is the second luminance signal Y _L output from the second adder 240 of the luminance signal processor 210 and the third adder 270 of the color signal processor 220. The first arithmetic luminance signal Y _L + Y _H obtained by summing the third luminance signals Y _H outputted from the signal is provided to the output unit 600.

The fifth adder 340 is a first arithmetic luminance signal Y _L + Y _H output from the fourth adder 330 of the luminance signal calculator 310 and a third subtractor of the color signal processor 220. A second arithmetic luminance signal Y _L + Y _H + C _H obtained by summing the third color signal C _H output from 280 is provided to the output unit 600.

The color signal calculator 320 includes a sixth adder 350 and a seventh adder 360.

The sixth adder 350 is a second color signal C _L output from the second subtracter 250 of the luminance signal processor 210 and the third subtractor 280 of the color signal processor 220. The first arithmetic color signal C _L + C _H obtained by summing the third color signals C _H outputted from the data is provided to the output unit 600.

The seventh adder 360 may include a color signal C _L + C _H output from the sixth adder 350 of the color signal calculator 320 and a third adder 270 of the color signal processor 220. a summing an output the third luminance signal (Y _H) second computing a color signal (C _L + C _{H H} + Y) is provided to the output section 600. the

The 3.58 MHz detector 400 includes a first 3.58 MHz detector 410 and a second 3.58 MHz detector 420.

The first 3.58 MHz detector 410 receives the first color signal A, which is output from the first subtractor 130 and includes the luminance signal component, and has a value of 3.58 MHz frequency component of the first color signal A. It provides to the control unit 500.

The second 3.58 MHz detector 420 receives the first luminance signal B output from the first adder 120, and controls the control unit 500 to obtain a 3.58 MHz frequency component value of the first luminance signal B. To provide.

The controller 500 is composed of a controller 510.

The controller 510 compares the 3.58 MHz frequency component of the first color signal from the first 3.58 MHz sensor 410 with the 3.58 MHz frequency component of the first luminance signal from the second 3.58 MHz sensor 420. The generated control signal is output to the luminance signal output unit 600.

The signal output unit 600 includes first switches SW1 and 610 and second switches SW2 and 620.

The first switches SW1 and 610 select the second luminance signal Y _L output from the second adder 240 in response to a control signal output from the controller 510 of the controller 500. As a final luminance signal, the first input terminal T1 for outputting to the outside through the luminance signal output terminal Y and the first operational luminance signal Y _L + Y _H output from the fourth adder 330 are output. A second input terminal T2 for selecting and outputting externally through the luminance signal output terminal Y as a final luminance signal, and a second arithmetic luminance signal Y _L + Y output from the fifth adder 340; _And third input terminals T1, T2, and T3 for selecting and outputting _H + C _H to the outside through the luminance signal output terminal Y as the final luminance signal.

The second switches SW2 and 620 finalize the second color signal C _L output from the first subtractor 250 in response to a control signal output from the controller 510 of the controller 500. The first input terminal T4 for outputting the color signal to the outside through the color signal output terminal C as a color signal, and the first operation color signal C _L + C _H output from the sixth adder 350 as a final color. A second input terminal T5 for outputting externally through the color signal output terminal C as a signal, and a second arithmetic color signal C _L + C _H + Y _H output from the seventh adder 360. And a third input terminal T6 for outputting externally through the color signal output terminal C as the final color signal.

4 is a flowchart illustrating a method of separating luminance and color signals according to an embodiment of the present invention using the luminance and color signal separation circuit shown in FIG. 3. The operation principle of the luminance and color signal separation circuit having the above configuration will be described with reference to the flowchart shown in FIG.

The composite video signal 102 input from the input terminal 101 is input to the 2H delayer 110, the first adder 120, and the first subtractor 130. The delayer 110 delays the input composite video signal 102 by 2H, and provides the composite video signal 112 delayed by 2H to the first adder 120 and the first subtractor 130 ( Step S1).

The first adder 120 adds the composite video signal 102 input from the input terminal 101 and the composite video signal 112 delayed by 2H from the 2H delayer 110 to include a color signal component. Outputs a first luminance signal B, and the first subtracter 130 is a composite video signal 112 delayed by 2H from the 2H delay unit 110 in the composite video signal 102 input from the input terminal 101. ) Is outputted to the second image separator 200 and the 3.58 MHz detector 400, respectively, to output the first color signal A including the luminance signal component (step S2).

The first 1H delayer 230 delays the first luminance signal B input from the first adder 120 by 1H and then transmits the 1H delayed first luminance signal 232 to the second adder 240. And the second subtractor 250 (step S3).

The second adder 240 adds the first luminance signal B output from the first adder 120 and the first luminance signal 232 delayed by the 1H delay from the first 1H delayer 230 to obtain a first sum. 2 outputs a luminance signal Y _L to the first adder T1 of the fourth adder 330 of the signal operation unit 300 and the first switch SW1 of the output unit 600, respectively. The second subtractor 250 subtracts the first luminance signal 232 delayed by the 1H from the first 1H delayer 230 from the first luminance signal B output from the first adder 120. The signal C _L is output and provided to the fifth adder 350 of the signal operation unit 300 and the first input terminal T4 of the second switch SW2 of the output unit 600 (step S4). ).

The second 1H delayer 260 delays the first color signal A, which is input from the first adder 120 and includes the luminance signal component, by 1H, and then receives the 1H delayed first color signal 262. To the third adder 270 and the third subtractor 280 (step S5).

The third adder 270 is output from the first subtracter 130 and includes a first color signal A including a luminance signal component and a first color signal 1H delayed from the second 1H delayer 260. 262 is added and the third luminance signal Y _H is output and provided to the fourth adder 330 of the luminance signal calculator 310 and the seventh adder 360 of the color signal calculator 320, and the third luminance signal Y _H is output. The subtractor 280 outputs the first color signal 262 delayed by 1H from the second 1H delayer 260 in the first color signal A, which is output from the first subtractor 130 and includes the luminance signal component. Subtracts and outputs the third color signal C _H to the fifth adder 340 of the luminance signal calculator 310 and the sixth adder 350 of the color signal calculator 320 (step S6).

The fourth adder 330 is the second luminance signal Y _L output from the second adder 240 of the luminance signal processor 210 and the third adder 270 of the color signal processor 220. The third luminance signal Y _H outputted from the sum is added to provide a first operational luminance signal Y _L + Y _H to the second input terminal T2 of the first switch, and the fifth adder 340. Denotes a luminance signal Y _L + Y _H output from the fourth adder 330 of the luminance signal calculator 310 and a third color signal output from the third subtractor 280 of the color signal processor 220. C _H ) is added to provide a second operational luminance signal Y _L + Y _H + C _H to the third input terminal T3 of the first switch SW1 (step S7).

The sixth adder 350 is a second color signal C _L output from the second subtracter 250 of the luminance signal processor 210 and the third subtractor 280 of the color signal processor 220. The third color signal C _H outputted from the sum is added to provide a first arithmetic color signal C _L + C _H to the second input terminal T4 of the second switch, and the seventh adder 360 is provided. Denotes a color signal C _L + C _H output from the sixth adder 350 of the color signal calculator 320 and a third luminance signal output from the third adder 270 of the color signal processor 220. Y _H ) is added to provide a second arithmetic color signal C _L + C _H + Y _H to the third input terminal T6 of the second switch SW2 (step S7).

The first 3.58 MHz detector 410 receives a first color signal A, which is output from the first subtractor 130 and includes a luminance signal component, and a value of 3.58 MHz frequency component of the first color signal A. The second 3.58 MHz detector 420 receives the first luminance signal B output from the first adder 120 and detects the 3.58 MHz frequency component value of the first luminance signal B. Then, the detected 3.58MHz frequency component value is provided to the controller 500 (step S8).

The controller 510 comparing the 3.58 MHz frequency component of the first color signal from the first 3.58 MHz sensor 410 with the 3.58 MHz frequency component of the first luminance signal from the second 3.58 MHz sensor 420 As a result of the comparison, a control signal is generated, and the generated control signal is output to the first switches SW1 and 610 and the second switches SW2 and 620 of the luminance signal output unit 600 (step S9).

In response to a control signal output from the controller 510 of the controller 500, the first switches SW1 and 610 including the first, second, and third input terminals T1, T2, and T3 are provided. A second luminance signal Y _L and a first operational luminance signal Y _L + Y _H input from the second adder 240, the fourth adder 330, and the fifth adder 340. And one luminance signal of the second arithmetic luminance signal Y _L + Y _H + C _H is selected and output to the outside via the luminance signal output terminal Y as a final luminance signal (step S10).

In response to a control signal output from the controller 510 of the controller 500, the second switches SW2 and 620 including the first, second, and third input terminals T4, T5, and T6 are provided. The second color signal C _L and the first arithmetic color signal C _L + C _H input from the second subtractor 250, the sixth adder 350, and the seventh adder 360. And one of the second arithmetic color signals C _L + C _H + Y _H is selected and output to the outside through the color signal output terminal C as a final color signal (step S11).

5 is a diagram illustrating the spectrum of each part of FIG. 3. 5, the operation method of the luminance and color signal separation circuit of the present invention will be described in detail.

As shown in FIG. 5, the present invention senses the 3.58 MHz frequency component of the color signal and the 3.58 MHz frequency component of the luminance signal, and according to the strength of the 3.58 MHz frequency component of the color signal and the 3.58 MHz frequency component of the luminance signal. It is determined whether the luminance signal and the color signal are selected. This selection operation is described in connection with the first switch and the second switch, as shown in Table 1 below.

TABLE 1

Selection operation of the first and second switches

A B First switch (SW1) Second switch (SW2) 大 大 Y _L T1 C _L T4 大 中 Y _L T1 C _L + C _H T5 大 Small Y _L T1 C _L + C _H + Y _H T6 中 大 Y _L + Y _H T2 C _L T4 中 中 Y _L + Y _H T2 C _L + C _H T5 中 Small Y _L T1 C _L + C _H T5 Small 大 Y _L + Y _H + C _H T3 C _L T4 Small 中 Y _L + Y _H T2 C _L T4 Small Small Y _L + Y _H T2 C _L + C _H T5

A and B in FIG. 5 output the A and B portions in FIG. 3. A is the 3.58 MHz frequency component of the luminance signal and B is the 3.58 MHz frequency component of the color signal. Here, Y _H is a high frequency component of the luminance signal, and Y _L is a low frequency component of the luminance signal. C _H is the high frequency component of the color signal, and C _L is the low frequency component of the color signal.

Referring to FIG. 5, when the energy of the 3.58 MHz frequency component of the color signal is high, the high frequency component of the luminance signal affects Y _H , and when the energy of the 3.58 MHz frequency component of the luminance signal is high, the color signal The high frequency component of C affects C _H. Therefore, when the energy of the 3.58 MHz frequency component of the color signal is high, only the Y _L component remains, and when the energy of the 3.58 MHz frequency component of the luminance signal is high, only the C _L component remains.

When the energy of the color signal is high and the energy of the luminance signal is low, the second luminance signal composed of the Y _L component is output as the final luminance signal, and the second operation having the C _L + C _H + Y _H component as the final color signal. The color signal is output. When the energy of the color signal is low and the energy of the luminance signal is high, a second arithmetic luminance signal having the Y _L + Y _H + C _H component is output as the final luminance signal, and the second composed of the C _L component as the final color signal. The color signal is output.

When the energy of the color signal and the luminance signal are both mid or low, the first arithmetic luminance signal composed of the Y _L + Y _H components is output as the final luminance signal, and the first composed of the C _L + C _H components as the final color signal. An arithmetic color signal is output.

When the energy of the color signal is medium, the energy of the luminance signal is high, or the energy of the color signal is low, and the energy of the luminance signal is medium, the first arithmetic luminance signal composed of Y _L + Y _H components as the final luminance signal is The second color signal composed of the C _L component is output as the final color signal.

When the energy of the color signal is high, the energy of the luminance signal is medium or the energy of the color signal is intermediate, and the energy of the luminance signal is low, the second luminance signal composed of the Y _L component is output as the final luminance signal, and the final As the color signal, a first arithmetic color signal composed of the C _L + C _H components is output.

Therefore, the 3.58 MHz frequency component of the color signal and the 3.58 MHz frequency component of the luminance signal are sensed, and the luminance signal and the color signal are selectively passed through according to the detected intensity of the frequency component, indicating that the color signal is mixed with the luminance signal. In this case, crosstalk is reduced when the luminance and color signals are separated from the composite video signal, thereby improving the separation of the luminance signal and the color signal.

As described above, the present invention reduces the crosstalk between the luminance signal and the color signal generated when the luminance signal and the color signal are separated from the composite video signal, thereby separating the luminance signal and the color signal into the luminance and color signals. The method and the separation circuit can be realized.

Although this invention was demonstrated concretely by the said Example, this invention is not restrict | limited by this, A deformation | transformation and improvement are possible within the range of common knowledge of a person skilled in the art.

Claims (14)

(a) processing a composite video signal input through an input terminal to separate a first luminance signal including a color signal component and a first color signal including a luminance signal component; (b) a second luminance signal and a second color signal are separated from the first luminance signal separated by step (a), and a third luminance signal and a second luminance signal are separated from the first color signal separated by step (a). Separating into three color signals; (c) calculating the second luminance signal, the second color signal, the third luminance signal, and the third color signal separated by step (a), to thereby calculate the first and second operational luminance signals and the first and second operational colors. Generating a signal; (d) detecting a 3.58 MHz frequency component from the first luminance signal and the first color signal separated by step (a); (e) generating a control signal in response to the 3.58 MHz frequency component values of the first luminance signal and the first color signal detected by step (d); And (f) In response to the control signal generated by step (e), one of the second luminance signal, the first operational luminance signal, and the second operational luminance signal is selected and output as a final luminance signal, and the second color Selecting one of a signal, a first arithmetic color signal, and a second arithmetic color signal and outputting the final color signal as a final color signal. The method of claim 1, wherein step (a) (a-1) delaying the composite video signal input through the input terminal by 2H; (a-2) adding the composite video signal and the luminance and color signals delayed by 2H by the step (a-1) to output the first luminance signal; And and (a-3) subtracting the luminance and color signals delayed by 2H by the step (a-1) from the composite image signal and outputting the first color signal. . The method of claim 2, wherein step (b) (b-1) delaying the first luminance signal added by the step (a-2) by 1 H; (b-2) adding the first luminance signal added by step (a-2) and the first luminance signal delayed by 1H by step (b-1) to output the second luminance signal; And (b-3) subtracting the first luminance signal delayed by 1H by the step (b-1) from the first luminance signal added by the step (a-2) to output a second color signal; A luminance signal processing step; And (b-4) delaying the first color signal subtracted by the step (a-3) by 1 H; (b-5) adding the first color signal subtracted by the step (a-3) and the first color signal delayed by 1H by the step (b-4) to output the third luminance signal; And (b-6) subtracting the first color signal delayed by 1H by the step (b-4) from the first color signal subtracted by the step (a-3) to output the third color signal The luminance and color signal separation method comprising a color signal processing step comprising a. The method of claim 3, wherein step (c) (c-1) adding the second luminance signal added by the step (b-2) and the third luminance signal added by the step (b-5) to output the first operational luminance signal; ; And (c-2) adding the first operational luminance signal added by step (c-1) and the third color signal subtracted by step (b-6) to output the second operational luminance signal A luminance signal calculating step comprising; And (c-3) adding the second color signal added by step (b-3) and the third color signal subtracted by step (b-6) to output the first arithmetic color signal ; And (c-4) adds the first arithmetic color signal added in step (c-3) and the third luminance signal subtracted in step (b-5) to output the second arithmetic color signal The luminance and color signal separation method comprising a color signal calculation step comprising the step of. The method of claim 2, wherein step (d) (d-1) detecting a 3.58 MHz frequency component from the first color signal output by step (a-2); And (d-2) detecting the 3.58 MHz frequency component from the first luminance signal output by step (a-3). The method of claim 5, wherein the step (e) comprises a step of outputting a control signal by comparing the detection value detected by the step (d-1) and the detection value detected by the step (d-2). Method for separating the luminance and color signals, characterized in that. 7. The method of claim 6, wherein the second luminance signal and the third luminance signal are added to output the first operational luminance signal, and the first operational luminance signal and the third color signal are added to add the second operational luminance. Outputs a signal, adds the second color signal and the third color signal to output the first arithmetic color signal, and adds the first arithmetic color signal and the third luminance signal to add the second arithmetic color signal Output Step (f) is When the detection value detected in step (d-1) is large and the detection value detected in step (d-2) is small, the second arithmetic luminance signal is used as the final luminance signal, and the second arithmetic color is used. Output a signal as the final color signal, When the detection value detected by the step (d-1) is small and the detection value detected by the step (d-2) is large, the second arithmetic luminance signal is used as the final luminance signal and the second color signal. Output as the final color signal, When both the detection value detected by the step (d-1) and the detection value detected by the step (d-2) are both medium or low, the first operational luminance signal is used as the final luminance signal. Outputs one arithmetic color signal as said final color signal, When the detection value detected by step (d-1) is intermediate and the detection value detected by step (d-2) is high or the detection value detected by step (d-1) is low and the step When the detected value detected by (d-2) is intermediate, the first operational luminance signal is output as the final luminance signal, and the first operational color signal is output as the final color signal. The detection value detected by step (d-1) is high and the detection value detected by step (d-2) is intermediate or the detection value detected by step (d-1) is intermediate and the When the detected value detected in step (d-2) is low, the luminance and color signals are separated, wherein the second luminance signal is output as the final luminance signal and the first operational luminance signal is output as the final luminance signal. Way. A first image separator 100 for processing the composite image signal 102 input through the input terminal 101 to separate the first luminance signal and the first color signal; The first luminance signal separated from the image separator 100 is processed to be separated into a second luminance signal and a second color signal, and the first color signal is processed to be separated into a third luminance signal and a third color signal. A second image separator 200; The first and second arithmetic luminance signals and the first and second arithmetic colors are calculated by calculating a second luminance signal, a second color signal, a third luminance signal, and a third color signal separated from the second image separator 200. A signal calculator 300 for outputting a signal; A 3.58 MHz detector 400 for detecting a 3.58 MHz frequency component from the first luminance signal and the first color signal from the first image separator 300; A control unit (500) for generating a control signal in response to the 3.58 MHz frequency component values of the first luminance signal and the first color signal from the 3.58 MHz detection unit (400); And In response to the control signal from the controller 500, one of the second luminance signal, the first operational luminance signal, and the second operational luminance signal is selected and output as a final luminance signal, and the second color signal, And an output unit (600) for selecting one of the first arithmetic color signal and the second arithmetic color signal and outputting it as a final color signal. The method of claim 8, wherein the first image separator 100 is A 2H delay unit 110 for delaying the complex video signal 102 input from the input terminal 101 by 2H; A first adder for outputting the first luminance signal B by adding the composite image signal 102 input from the input terminal 101 and the luminance and color signals 112 delayed by the 2H from the 2H delayer 110. 120); And A first subtractor for outputting the first color signal B by subtracting the 2H delayed luminance and color signals 112 from the 2H delayer 110 from the composite video signal 102 input from the input terminal 101. 130) luminance and color signal separation circuit, characterized in that. 10. The method of claim 9, wherein the second image separator 200 A first 1H delayer (230) for delaying the first luminance signal 1H input from the first adder (120); A second adder for outputting a second luminance signal by adding the first luminance signal input from the first adder 120 and the first luminance signal 232 delayed by 1H from the first 1H delayer 230 ( 240); And subtracting the first luminance signal 232 delayed by the 1H delay from the first 1H delayer 230 from the first luminance signal B input from the first adder 120 to output a second color signal. A luminance signal processor 210 including a second subtractor 250; And A second 1H delayer (260) for delaying the first color signal 1H input from the first subtractor (130); A third adder for outputting a third luminance signal by adding the first color signal input from the first subtractor 130 and the first color signal 262 delayed by 1H from the second 1H delayer 260 ( 270); And a third subtractor for outputting a third color signal by subtracting the first luminance signal 262 delayed by 1H from the second 1H delayer 260 from the first color signal input from the first subtractor 130. A luminance and color signal separation circuit, characterized in that consisting of a color signal processing unit 220 including a (280). The method of claim 10, wherein the signal operation unit 300 A fourth adder (330) for adding a second luminance signal input from the second adder (240) and a third luminance signal input from the third adder (270) to output a first operational luminance signal; And a fifth adder 340 for adding a luminance signal input from the fourth adder 330 and a third color signal C _H input from the third subtractor 280 to output a second arithmetic luminance signal. A luminance signal calculator 310 including a; And A sixth adder (350) for outputting a first operation color signal by adding a second color signal input from the second subtractor (250) and a third color signal input from the third subtractor (280); And a seventh adder 360 for outputting a second arithmetic color signal by adding a color signal input from the sixth adder 350 and a third luminance signal input from the third adder 270. The luminance and color signal separation circuit, characterized in that consisting of a signal operation unit (320). The method of claim 8, wherein the 3.58MHz detector 400 A first 3.58 MHz detector 410 for detecting a 3.58 MHz frequency component in a first color signal from the first subtractor 130; And And a second 3.58 MHz detector (420) for detecting a 3.58 MHz frequency component in the first luminance signal from the first adder (120). The controller 500 of claim 12, wherein the controller 500 includes a controller 510 for outputting a control signal according to a detection value output from the first 3.58 MHz detector 410 and the second 3.58 MHz detector 420. A luminance and color signal separation circuit, characterized in that. The method of claim 13, wherein the signal operation unit 300 A fourth adder (330) for adding the second luminance signal and the third luminance signal to output the first operational luminance signal; And a fifth adder (340) for adding the first operational luminance signal and the third color signal to output a second operational luminance signal. And A sixth adder (350) for adding the second color signal and the third color signal to output the first arithmetic color signal; And a seventh adder 360 for adding the first arithmetic color signal and the third luminance signal to output the second arithmetic color signal. The output unit 600 is The second from the second adder 240, the fourth adder 330, and the fifth adder 340, which are input in response to a control signal output from the controller 510 of the controller 500. A first, second, and third input terminal (T1, T2, and T3) for selecting one of the luminance signal, the first operational luminance signal, and the second operational luminance signal and outputting it as a final luminance signal; 1 switch SW1 610; And The second subtractor 250, the sixth adder 350, and the seventh adder 360, which are input in response to a control signal output from the controller 510 of the controller 500. A first, second, and third input terminal (T4, T5, and T6) for selecting one of a color signal, a first arithmetic color signal, and a second arithmetic color signal to output as a final color signal; A luminance and color signal separation circuit, characterized in that composed of two switches (SW2, 620).

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