JPH08163583A - Three-dimensional device for separating luminance signal from color signal - Google Patents

Abstract

PURPOSE: To sensitively detect the change of a pattern such as a scene change, etc., in a three-dimensional luminance signal and color signal separation, to lower the detection sensitivity for the movement of a high-band signal such as the movement of a fine pattern and to prevent a high and luminance signal from being erroneously decided to be a carrier color signal of a still image due to the horizontal movement of vertical stripes, etc. CONSTITUTION: By detecting the phase of a high-band video signal in a phase detection circuit 203, detecting the level of a signal in a signal level detection circuit 207 and passing each movement detected in a threshold circuit A.205 and a threshold circuit B.209 through an AND circuit 206, the change of a pattern such as a scene change, etc., is sensitively detected and the detection sensitivity for the movement of a high-band signal such as the movement of a fine pattern is lowered. According to this motion detection signal, whether a two-dimensional Y/C separation or a three-dimensional Y/C separation is performed for an inputted composite video signal is determined.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a luminance signal / color signal separation device for separating a composite video signal into a luminance signal and a color signal.

[0002]

2. Description of the Related Art FIG. 13 is a block diagram of a conventional luminance signal / color signal separation device. In FIG. 13, reference numeral 1302 denotes a two-dimensional Y / C separation filter for separating a luminance signal and color signal by two-dimensional processing, 1303 denotes a three-dimensional Y / C separation filter for separating a luminance signal and color signal by three-dimensional processing, and 1304 denotes A motion detection circuit 1305 is a switching circuit.

In the conventional luminance signal / chrominance signal separating apparatus having the above-mentioned structure, when the NTSC signal is inputted from the terminal 1301, it is inputted to the two-dimensional Y / C separating circuit 1302 and the three-dimensional Y / C separating circuit 1303. To be done. Two-dimensional Y / C
The separation circuit performs luminance signal / chrominance signal separation (Y / C separation) by using signals in the same field, and can separate still images and moving images in the same manner, but complete separation is difficult. Also, the three-dimensional Y / C separation circuit 1303 performs Y / C separation using signals of different fields. For example, if you use signals that are one frame apart, you can achieve complete separation in still images.
In video, it causes noticeable deterioration such as false contours. Therefore,
The motion detection circuit 1304 determines whether the image is a moving image or a still image, and the switching circuit 1305 mainly selects the output of the two-dimensional Y / C separation circuit 1302 if it is a moving image and mainly outputs the three-dimensional Y if it is a still image. / C separation circuit 1303
Is controlled to select the output of.

14 and 15 show the detailed structure of the conventional motion detecting circuit 1304. In FIG. 14, reference numerals 1402 and 1403 denote a frame memory that delays a signal for one frame period, 1404 denotes a subtractor, and 1405.
Is an absolute value circuit (ABS), 1406 is a low pass filter (LPF), and 1407 is a threshold circuit.

When an NTSC signal is input to the conventional motion detection circuit configured as shown in FIG. 14, the frame memory 1
Subtractor 1 is delayed for two frame periods at 402 and 1403.
At 404, the difference between the delayed and undelayed signal is determined. Since the carrier color signal of the NTSC signal has the same phase in the two frame periods, the output of the subtractor 1404 becomes a difference signal of the signals of the entire band in the two frame periods. ABS140
The absolute value of this difference signal is obtained at 5, and the LPF 1406 eliminates the effects of smoothing and noise and inputs it to the threshold circuit 1407. The threshold circuit 1407 determines that the output of the LPF 1406 is a moving image when the output is equal to or higher than a predetermined threshold, and determines that the output is a still image when the output is less than the threshold.

Returning to FIG. 13, the switching circuit 1305 mainly selects the output of the three-dimensional Y / C separation circuit 1303 in the case of a still image and the output of the conventional motion detection circuit 1304 described above in the case of a moving image. Two-dimensional Y / C separation circuit 1
The output of 302 is mainly selected.

FIG. 15 is a block diagram of another conventional motion detection circuit. Reference numeral 1502 denotes a high pass filter (HPF), 15
03, 1504, 1507 are frame memories, 1505
And 1508 are subtractors, 1509 and 1512 are absolute value circuits, 1506, 1510 and 1513 are LPFs and 1511.
Reference numerals 1514 and 1514 are threshold circuits, and 1515 is an OR circuit.

In the conventional motion detection circuit configured as described above, when the NTSC signal is input from the terminal 1501, the high frequency video signal is separated by the HPF 1502. Since the high-frequency video signal includes the carrier color signal, the amount of motion can be obtained by delaying the frame memories 1503 and 1504 for two frame periods and calculating the difference between them by the subtractor 1505.

An absolute value of this movement amount is calculated by the ABS 1509, a low-frequency component is extracted by the LPF 1510, compared with a predetermined threshold value by the threshold circuit 1511, and is determined in the same manner as the above-mentioned threshold circuit 1407. , 1 is output when it is determined to be a moving image, for example.

The LPF 1506 extracts only the low band luminance signal. Since this low-frequency luminance signal is not modulated, the amount of motion can be obtained by calculating the difference from the signal delayed by the frame memory 1507 by the subtractor 1508. Similarly, with respect to this movement amount, the ABS 1512 and the LPF 1513 extract the low-frequency component of the absolute value, the threshold circuit 1514 compares it with a predetermined threshold value, and similarly to the threshold circuit 1511, it is determined to be a moving image, for example. 1 is output in the case. The OR circuit 1515 calculates the OR of the outputs of the threshold circuit 1511 and the threshold circuit 1514. The output of the logical sum circuit 1515 becomes 1 when the motion is detected in either the high band video signal or the low band luminance signal, and the switching circuit 1305 switches the outputs of the two Y / C separation filters according to this signal. .

[0011]

However, in the conventional three-dimensional luminance signal color signal separation device configured as described above, a change in the carrier color signal having a small signal level when the pattern changes is detected with high sensitivity. However, it is difficult to detect the change in high-frequency luminance signal that has a large signal level when moving a fine pattern, and it is difficult to reduce sensitivity at the same time. When the conspicuous and fine pattern moves gently, the Y / C separation filter is switched unnecessarily, and there arise problems such as a conspicuous difference in resolution and a large amount of cross color. In addition, when a fine vertical stripe pattern moves in the horizontal direction, if the striped pattern is inverted every frame, it is erroneously determined as a carrier color signal of a still image.

[0012]

A three-dimensional luminance signal color signal separation device of the present invention uses a composite video signal as an input signal and separates a luminance signal and a color signal using a signal in the same field as the signal of interest. A two-dimensional luminance signal color signal separation circuit, a three-dimensional luminance signal color signal separation circuit that separates a luminance signal and a color signal using a field or frame signal different from the signal of interest, and detects the phase of a high-frequency video signal. A phase detection circuit, an inter-frame processing circuit that detects a change in the phase in the time direction, a threshold circuit A that determines whether a pattern is a still image or a moving image based on the output of the inter-frame processing circuit, and a high-frequency video signal. Signal level detecting circuit for detecting the signal level of the above, a threshold value circuit B for judging whether the picture is a still image or a moving image by the output of the signal level detecting circuit, the threshold value circuit A and the threshold value. A determination circuit for determining whether the pattern is a still image or a moving image by the output of the path B, and the in-phase of the inter-frame difference signal of the low frequency signal of the input signal and the carrier color signal of the high frequency signal of the input signal and in the time direction. A motion detection circuit A that performs motion detection using a distant signal, a motion detection circuit that performs motion detection using the output of the determination circuit and the output of the motion detection circuit A, and the output of the motion detection circuit According to the above, a filter selection mixing circuit for switching the outputs of the two-dimensional luminance signal color signal separation circuit and the three-dimensional luminance signal color signal separation circuit or mixing and outputting the mixed signal is provided.

Further, the three-dimensional luminance signal color signal separation device of the present invention uses the composite video signal as an input signal and uses the signal of the same field as the signal of interest to separate the luminance signal and the color signal. A color signal separation circuit, a three-dimensional luminance signal color signal separation circuit that separates a luminance signal and a color signal using a field or frame signal different from the signal of interest, and a phase detection circuit that detects the phase of a high-frequency video signal. A judgment circuit A for judging whether the phase difference between the fields or between the frames or between the two frames is the phase difference of the carrier color signal, and the inter-frame difference signal of the low frequency signal of the input signal and the input signal. And a motion detection circuit A that performs motion detection using signals that are in phase with the carrier color signal of the high frequency signal and that are separated in the time direction, and output the output of the determination circuit A and the output of the motion detection circuit A. Output of the two-dimensional luminance signal chrominance signal separation circuit and the three-dimensional luminance signal chrominance signal separation circuit in accordance with the output of the motion detection circuit and the motion detection circuit. And a filter selection mixing circuit.

Further, the three-dimensional luminance signal color signal separation device of the present invention uses the composite video signal as an input signal and uses the signal of the same field as the signal of interest to separate the luminance signal and the color signal. A color signal separation circuit, a three-dimensional luminance signal color signal separation circuit that separates a luminance signal and a color signal using a field or frame signal different from the signal of interest, and a phase detection circuit that detects the phase of a high-frequency video signal. , A phase extracting circuit for extracting a state of a phase in the vicinity of the signal of interest of the phase, a determination circuit F for determining whether or not there is a carrier color signal based on the output of the phase extracting circuit, and a low level of the input signal. Of the inter-frame difference signal of the range signal and the carrier color signal of the high range signal of the input signal, which are in phase with each other and are separated in the time direction, to detect the amount of motion. A motion detection circuit having a conversion circuit for converting the output of the motion amount detection circuit according to the above, and the two-dimensional luminance signal color signal separation circuit and the three-dimensional luminance signal color signal separation circuit according to the output of the conversion circuit. And a filter selection / mixing circuit for switching outputs or mixing and outputting.

[0015]

According to the present invention, the change of the picture can be detected from the slight change of the color signal by the phase detecting circuit and the level detecting circuit.
It acts to reduce the detection sensitivity to changes in the high-frequency luminance signal.

The output of the determination circuit A is prevented from being erroneously determined as a moving color signal of a high-frequency luminance signal and a carrier color signal of a still image.

Further, in the near phase extraction circuit and the judgment circuit E,
By detecting whether or not there is a carrier color signal in the vicinity of the signal of interest, and by changing the output of the motion amount detection circuit according to this detection result, it is possible to detect changes in the pattern with high sensitivity,
It works to reduce the detection sensitivity in the movement of fine patterns.

[0018]

1 is a block diagram of a three-dimensional luminance signal / chrominance signal separation device according to a first embodiment of the present invention. In FIG.
101 is an input terminal for inputting a composite video signal, and 102 is 2
A two-dimensional Y / C separation filter that separates a luminance signal and a color signal by three-dimensional processing, 103 is a three-dimensional Y / C separation filter that separates a luminance signal and a color signal by three-dimensional processing, and 104 is a motion that detects a motion of an image. A detection circuit, 105 is a motion detection circuit 10
2D Y / C separation fills 102 and 3 according to the output of 4
It is a filter selection mixing circuit that mixes the outputs of the dimension Y / C separation filter 103.

In the three-dimensional luminance signal chrominance signal separating device having such a structure, when the composite video signal is inputted from the terminal 101, it is first inputted to the two-dimensional Y / C separating filter 102. The two-dimensional Y / C separation filter 102 performs Y / C separation using signals in the vicinity of the same field. For example, a bandpass filter centered on the subcarrier frequency can be constructed by performing addition and subtraction with a signal that is a half cycle of the subcarrier. Is used as the luminance signal. Also,
A so-called comb filter can be configured by performing addition and subtraction with signals in the vicinity of one line when the composite video signal is an NTSC signal and in the vicinity of two lines when the composite video signal is a PAL signal. This comb filter can be combined with the bandpass filter described above to form an adaptive two-dimensional Y / C separation circuit that performs correlation determination and adaptively switches between the two filters.

The three-dimensional Y / C separation filter 103 is a Y / C separation circuit using signals of different fields. N
In the case of the TSC signal, the phase of the carrier color signal of the signal separated by one frame period is inverted. Therefore, the carrier color signal can be removed by adding the high-frequency video signals separated by one frame period. In addition, the phase of the carrier color signal of the signal distant from the 263 horizontal scanning period is similarly inverted, and the carrier color signal can be removed by adding these signals.

The motion detection circuit 104 detects the degree of motion of the entire screen when the image is a still image or a moving image, or when it is a moving image, using the signals of different fields, and the filter selection mixing circuit 105 receives it. Output. The filter selection mixing circuit 105, if the output of the motion detection circuit indicates that the motion is stationary, the three-dimensional Y / C separation filter 103.
If the output of the motion detection circuit 104 indicates that the output is a moving image, the three-dimensional Y /
C separation filter 103 and two-dimensional Y / C separation filter 10
The two outputs are mixed at a predetermined ratio.

FIG. 2 illustrates the details of the motion detection circuit 104 in the first embodiment described above. Figure 2
In 203, a phase detection circuit 203, an interframe processing circuit 204, a threshold circuit A 205, an AND circuit 206, a signal level detection circuit 207, a low-pass filter (LPF) 208, and a threshold circuit 209. B and 210 are conventional motion detection circuits, and 211 is a determination circuit.

In the motion detection circuit configured as shown in FIG. 2, when the composite video signal is input from the terminal 201, the high pass video signal is extracted by the high pass filter (HPF) 202. This high frequency component is input to the phase detection circuit 203. FIG. 3 shows the detailed configuration of the phase detection circuit 203.

In FIG. 3, 302 is 1 of the subcarrier period.
A delay circuit (D) for delaying / 4 cycle, 303 is a division circuit for division, and 304 is an angle conversion table.

In the phase detection circuit configured as described above, when a high frequency image signal is input from the terminal 301, the division of the signal delayed by the delay circuit 302 and the signal not delayed is performed by the division circuit. At 303. Here, the output of the delay circuit 302 is S0 and the input signal is S1.

If the amplitude of the high frequency signal is A, then S
0 and S1 are represented by the following equations. S0 = A.sin (.theta.) S1 = A.sin (.theta. +. Pi./2)=A.cos(.theta.) Therefore, the output of the division circuit 303 is expressed by the following equation.

S0 / S1 = (A · sin (θ)) / (A · cos (θ)) = tan (θ) This value is converted by the angle conversion table 304 to obtain the angle θ.

Now, in FIG. 2, the angle θ output from the phase conversion circuit 203 is input to the interframe processing circuit 204. FIG. 4 shows the detailed configuration of the inter-frame processing circuit 204.

In FIG. 4, 402 and 404 are field memories A, 403 is field memories B, 405 and 4
Reference numerals 07 and 409 are subtractors, and reference numerals 406 and 408 are absolute value circuits (ABS). In the NTSC signal, the delay amount of the field memories A, 402 and 404 is 262 horizontal scanning period (262H), the delay amount of the field memory B, 403 is 263 horizontal scanning period (263H), and in the case of the PAL signal, the field memory A. The delay amount of 402 and 404 is 3
12H, the delay amount of field memory B 403 is 313
H.

In the case of the NTSC signal, the carrier color signal components of the signals separated by 262H have the same phase. Therefore, when a color signal exists, 0 degrees are output from the subtracters 405 and 409, absolute values are obtained by the ABSs 406 and 408, respectively, and the difference between 263H is obtained by the subtractor 407. In this way, the subtractor 407 obtains the slope of the change rate, which is the second derivative of the inter-field difference of the phase angle.

In the case of the PAL signal, the carrier color signal components of the signals separated by 312H have opposite phases. Therefore, when a color signal exists, 180 degrees are output from the subtracters 405 and 409, absolute values are obtained by the ABSs 406 and 408, respectively, and the difference between 313H is obtained by the subtractor 407. In this way, the subtractor 407 obtains the slope of the rate of change, which is the second derivative of the field difference of the phase angle, as in the case of the NTSC signal.

In the case of the first-order differentiation, the difference between fields is different between the high-frequency luminance signal and the chrominance signal.
Although the signals cannot be processed by the same processing circuit, this problem can be solved by using the second derivative. In this way, when the same pattern continues, the output of the inter-frame processing circuit 204 becomes small, and when the pattern changes, it becomes large, and it is determined whether or not it is larger than the threshold value of the threshold circuit A 205. If it is larger, 1 is output. That is, when there is a change in the picture, the output of the threshold value circuit A 205 becomes 1.

Returning to FIG. 2, one of the outputs of the HPF 202 is also input to the signal level detection circuit 207. In the signal level detection circuit 207, 262 in the case of the NTSC signal
The absolute value of the difference between the signals having the same phase of the carrier color signals separated by H is calculated. In the case of the PAL signal, the absolute value of the difference between the signals having the same phase of the carrier color signals separated by 512H is calculated and output. , The low-pass filter 208 extracts the low-frequency component and inputs it to the threshold circuit B · 209. Threshold circuit B-2
At 09, the output of the LPF 208 is compared with a certain threshold value, and when it is larger than the threshold value, 1 is output. That is, the output from the threshold value circuit B 209 becomes 1 when the signal level changes between fields.

In the logical product circuit 206, the threshold circuit A.
The logical product of 205 and the output of the threshold circuit B209 is calculated. When there is a change in the phase and a change in the signal level between fields, the output of the AND circuit 206 is 1
Becomes The output of the AND circuit 206 being 1 indicates that the pattern is changed.

When the detection sensitivity of the change in the picture is to be increased, when only the change in the signal level is examined as in the conventional case, the amplitude is smaller than that of the luminance signal of the chrominance signal, so that the threshold value needs to be reduced. However, when there are many high band luminance signals, for example, when there is a striped pattern, it is better to use three-dimensional Y / C separation as much as possible. Therefore, it is necessary to increase the threshold value, which is the reverse of the case of color signals.

Therefore, as shown in FIG. 2, if it is determined that the pattern changes only when both the signal level and the phase change, the threshold value for detecting the signal level may be lowered. If there is no change in the phase, it is not recognized as a change in the pattern, and the above problem can be solved.

The output of the conventional motion detection circuit 210 is also input to the determination circuit 211. This conventional motion detection circuit 210 is, for example, the conventional motion detection circuit shown in FIGS. 12 and 13, and a detailed description thereof will be omitted. The outputs of the conventional motion detection circuit 210 and the AND circuit 206 are the determination circuit 21.
When the output of the logical product circuit 206 is not 1, the output of the conventional motion detection circuit 210 is output as it is, and when the output of the logical product circuit 206 is 1, it is determined as a pattern change portion.

As described above, according to the present embodiment, in the case of a color signal in which the change in amplitude is small, the change in the pattern is detected by lowering the threshold for level detection, and the change in amplitude is large. By using phase detection in the case of a luminance signal, it is possible to prevent unnecessary use of three-dimensional Y / C separation.

FIG. 5 is a block diagram of a three-dimensional luminance signal / color signal separating apparatus according to a second embodiment of the present invention. In FIG. 5, those having the same numbers as those in the other figures have similar functions, and therefore their explanations are omitted.

In FIG. 5, reference numeral 501 denotes a phase determination circuit, 5
Reference numeral 02 is a second determination circuit, and reference numeral 503 is a second motion detection circuit including a phase determination circuit 501, a second determination circuit 502, and a conventional motion detection circuit 210.

In the luminance signal / color signal separation device of FIG. 5 configured as described above, the second motion detection circuit 503 determines whether the image is a still image or a moving image, and the degree of motion. To detect.

FIG. 6 shows the detailed configuration of the phase determination circuit 501. In FIG. 6, those having the same numbers as those in the other figures have the same functions, and therefore their explanation is omitted.
The field memory B of 605 and 605 has the same function as the field memory B 403 of FIG. 4, and the field memory A of 603 and 604 is the field memory 402 and 40 of FIG.
Works the same as 4. 607, 608, and 609 are subtraction circuits, 610 is a third determination circuit, 611 is a fourth determination circuit, 612 is a fifth determination circuit, and 613 is a sixth determination circuit.

In the phase determination circuit configured as shown in FIG. 6, the high frequency image signal input from the terminal 601 is input to the phase detection circuit 203 and the phase of the high frequency image signal is obtained. The output of this phase detection circuit is the field memory B
602, field memory A 603, field memory A 604, and field memory B 605 are sequentially input. The output p1 of the phase detection circuit 203, the output p5 of the field memory B.602, and the output p5 of the field memory A.
When the output of 603 is p3, the output of the field memory A.604 is p4, and the output of the field memory B.605 is p6, p1, p5, p3, p4, and p6 are arranged as shown in FIG.

In the case of the NTSC signal, if there is a carrier color signal, the phase difference between p1 and p3 is 180 degrees, the phase difference between p3 and p5 is 0 degrees, and the phase difference between p1 and p6 is 0 degrees. The fifth determination circuit 612 determines whether the difference between p1 and p3 calculated by the subtractor 607 is 180 degrees, and outputs 1 in that case. In the fourth determination circuit 611, p1 which is the output of the subtractor 609 is output.
It is determined whether the difference between p6 and p6 is 0 degree, and 1 is output in that case. The third determination circuit 610 determines whether or not the difference between the outputs p3 and p4 of the subtractor 608 is 0 degree, and outputs 1 in this case.

The sixth judgment circuit 613 is set to 1 when both the outputs of the fifth judgment circuit 612 and the fourth judgment circuit 611 are 1 and when the output of the third judgment circuit 610 is not 1.
Is output. That is, the phase relationship between p1, p3 and p6 indicates the carrier color signal, but 1 is output when the phase relationship between p3 and p5 is not the relationship between the carrier color signals.

The conventional motion detection circuit 210 has a structure as shown in FIG. 13 or 14. When a vertical stripe pattern is input to this conventional motion detection circuit and moves in the horizontal direction so as to be inverted every frame, the high-frequency luminance signal is phase-shifted in each frame in the same manner as the carrier color signal. Is determined, it is determined to be a still image with color.

However, at the output of the phase detection circuit 203,
Since the phase difference between p3 and p4 is not 0 degrees but almost 90 degrees, the output of the third determination circuit 610 does not become 1 and the output of the sixth determination circuit 613 becomes 1. In this case, the second
Even if the output of the conventional motion detection circuit 210 indicates a still image, the determination circuit 502 determines that the output is a moving image, and the filter selection mixing circuit 505 correctly selects the two-dimensional Y / C separation filter. Can be prevented. When a still image with a color signal is input, the output of the sixth determination circuit 613 becomes 1, and in this case, the second determination circuit 502 determines that the image is a still image.

In the case of the PAL signal, if there is a carrier color signal, the phase difference between p1 and p3 is 90 degrees, and the fifth judgment circuit 6
12 determines whether it is 90 degrees, the phase difference between p3 and p4 is 180 degrees, and the third determination circuit 610 determines whether it is 180 degrees, and the phase difference between p1 and p6 is 180 degrees. The determination circuit 611 of No. 4 determines whether it is 180 degrees.
Furthermore, the third determination circuit 610 determines the phase relationship between p3 and p4, but may determine the phase relationship between p3 and p5.

FIG. 7 is a block diagram of a three-dimensional luminance signal / color signal separation device according to a third embodiment of the present invention. In FIG. 7, those having the same numbers as those in the other figures have similar functions, and thus detailed description thereof will be omitted. 702 is a second filter selection mixing circuit, and 703 is a second motion detection circuit.

The terminal 70 of the above luminance signal / color signal separation device
When the composite video signal from 1 is input, it is input to the second motion detection circuit 703. This second motion detection circuit 703
FIG. 8 shows a detailed configuration of the above.

In FIG. 8, components having the same numbers as those in the other drawings have similar functions, and therefore detailed description thereof will be omitted. 80
3 is a near phase extraction circuit, 804 is a seventh determination circuit, 80
Reference numeral 2 is a motion amount detection circuit, and 805 is a conversion circuit.

When the composite video signal is input to the second motion detecting circuit 703 configured as described above, the phase is obtained by the phase detecting circuit 203 in FIG.
It is input to 03. FIG. 10 shows a detailed configuration of this near phase extraction circuit. In FIG. 10, 1002
Is a line memory for delaying one horizontal scanning period, 1003 is a subtractor, 1004 is ABS, and 1005 is LPF.

In the near phase extraction circuit configured as described above, when a phase signal is input from the terminal 1001, the difference between the phase signal delayed by one line in the line memory 1002 and the undelayed phase signal is subtracted. The low frequency component, which is calculated by 1003 and is less affected by noise of its absolute value, is separated by the ABS 1004 and the LPF 1005. Now, returning to FIG. 8, the seventh determination circuit 804 detects whether or not the output of the near phase extraction circuit 803 is 180 degrees, and outputs 1 in that case.

Also, the composite video signal is a motion amount detection circuit 80.
It is also input to 2. FIG. 9 shows a detailed configuration of the motion amount detection circuit 802. FIG. 9 shows an example of an NTSC signal, and 902 is a high pass filter (HPF),
903, 904 and 909 are frame memories for delaying one frame period, 905 and 910 are subtractors, and 906 and 91.
Reference numeral 1 is an absolute value circuit (ABS), 907, 908 and 912 are low pass filters (LPF), and 913 is an adder.

Motion amount detection circuit 8 constructed as shown in FIG.
When the NTSC signal is input to the terminal 02 from the terminal 901, H
The PF 902 extracts the high frequency image signal. This high-frequency video signal is sequentially input to the frame memories 903 and 904, delayed by two frame periods, and the subtractor 905 calculates the difference between the delayed high-frequency video signal and the undelayed high-frequency video signal. The absolute value is calculated by the ABS 906. In the case of the NTSC signal, the phase of the carrier chrominance signal is the same when it is separated by two frame periods. Therefore, the output of the subtractor 905 is the difference between the two frames of both the high-frequency luminance signal and the carrier chrominance signal, and the absolute value is determined by the LPF 907. The low frequency component of the value is obtained. This is the amount of motion detected from the high frequency image signal.

Further, the NTSC signal input from 901 is extracted as a low-frequency luminance signal by the LPF 908 and input to the frame memory 909. Frame memory 90
The difference between the low band luminance signal delayed by one frame period which is the output of 9 and the low band luminance signal which is not delayed is the subtractor 91.
It is calculated by 0 and input to ABS911. This ABS
The output of 911 is the amount of movement seen from the low-frequency luminance signal, and is the LPF.
At 912, the low-frequency component is extracted and input to the adder 913, and is added to the motion amount detected from the high-frequency video signal output from the LPF 907 to obtain the total motion amount at the terminal 9
It is output from 14.

The conversion circuit 805 includes a motion amount detection circuit 80.
The output of 2 and the output of the seventh determination circuit 804 are input. If the output of the seventh determination circuit 804 indicates that there is a carrier color signal, the output of the motion amount detection circuit 802 is converted so as to increase the amount of movement, and the seventh determination circuit 804
If the output of indicates that there is no carrier color signal, it is changed so as to reduce the movement amount.

The output of the conversion circuit 805 shown in FIG. 8 is sent to the second filter selection mixing circuit 702 of FIG.

As described above, when there is a carrier color signal, the sensitivity of motion detection is increased so that the three-dimensional Y / C can be obtained even if the design changes.
Separation is used to prevent conspicuous dot interference, and when there is no carrier color signal, the sensitivity of motion detection is lowered to reduce the two-dimensional Y
The / C separation circuit can be used to prevent the deterioration of resolution and the occurrence of cross color.

For the PAL signal, the line memory 1002 of the near-phase extraction circuit 803 may be a two-line memory that delays for two horizontal scanning periods. Total 4 frame periods, or 2 frame periods plus 1
It should be a horizontal crossing period.

[0061]

As described above, the three-dimensional luminance signal color signal separation device of the present invention combines the motion detection based on the phase signal and the motion detection based on the signal level to reduce the signal level when the pattern changes. It is desirable to detect changes in the carrier color signal with high sensitivity, and it is desirable that the number of filters to be switched is small.The signal level is high when a fine pattern moves. It is possible to eliminate the deterioration due to the use of an incorrect filter due to the erroneous determination of the motion detection.

Further, according to the present invention, by examining the difference between signals of fields or frames of the phase signal,
It is possible to prevent the movement of the high-frequency luminance signal such as the movement of the vertical stripe from being erroneously determined as the carrier color signal of the still image.

Further, according to the present invention, it is determined whether there is a carrier color signal or a high-frequency luminance signal based on the phase relationship of signals in the vicinity of the signal being processed, and the amount of movement is changed according to this result to thereby change the pattern. It is desirable to detect changes in the carrier color signal with a small signal level when there is a change in the image with high sensitivity, and it is desirable that there be few filter changes. The sensitivity can be lowered, and the effect is great.

[Brief description of drawings]

FIG. 1 shows a first three-dimensional luminance signal / color signal separation device according to the present invention.
Diagram of the embodiment

FIG. 2 is a configuration diagram of a motion detection circuit according to the first embodiment.

FIG. 3 is a configuration diagram of a phase detection circuit according to the first embodiment.

FIG. 4 is a configuration diagram of an interframe processing circuit according to the first embodiment.

FIG. 5 shows a second three-dimensional luminance signal / color signal separation device according to the present invention.
Configuration diagram of the example

FIG. 6 is a configuration diagram of a phase determination circuit according to a second embodiment.

FIG. 7 is a third diagram of a three-dimensional luminance signal / color signal separation device according to the present invention.
Diagram of the embodiment

FIG. 8 is a configuration diagram of a second motion detection circuit according to the third embodiment.

FIG. 9 is a configuration diagram of a motion amount detection circuit according to a third embodiment.

FIG. 10 is a configuration diagram of a near phase extraction circuit according to a third embodiment.

FIG. 11 is an operation explanatory diagram of the conversion circuit according to the third embodiment.

FIG. 12 is an operation explanatory diagram of the phase determination circuit according to the second embodiment.

FIG. 13 is a configuration diagram of a conventional three-dimensional luminance signal / color signal separation device.

FIG. 14 is a configuration diagram of a conventional motion detection circuit.

FIG. 15 is a block diagram of another conventional motion detection circuit.

[Explanation of symbols]

 102 two-dimensional Y / C separation filter 103 three-dimensional Y / C separation filter 104, 503, 703 motion detection circuit 105, 505, 702 filter selection mixing circuit

Claims (9)

[Claims] 1. A two-dimensional luminance signal color signal separation circuit for separating a luminance signal and a color signal by using a composite video signal as an input signal and using a signal in the same field as the signal of interest, and a field different from the signal of interest or A three-dimensional luminance signal color signal separation circuit that separates a luminance signal and a color signal using a frame signal, a phase detection circuit that detects the phase of a high-frequency video signal, and a frame that detects a change in the phase in the time direction. A processing circuit,
A threshold value circuit A for judging whether a picture is a still image or a moving picture by the output of the inter-frame processing circuit, a signal level detection circuit for detecting the signal level of a high frequency image signal, and a picture by the output of the signal level detection circuit. Is a still image or a moving image, a threshold circuit for determining whether the pattern is a still image or a moving image based on the outputs of the threshold circuit A and the threshold circuit B, and the input signal A motion detection circuit A that performs motion detection using signals that are in phase with the inter-frame difference signal of the low-frequency signal and the carrier color signal of the high-frequency signal of the input signal and are separated in the time direction; A motion detection circuit that performs motion detection using an output and the output of the motion detection circuit A, and the two-dimensional luminance signal color signal separation circuit and the three-dimensional luminance signal color signal separation circuit according to the output of the motion detection circuit. To switch the output of Alternatively, a three-dimensional luminance signal / color signal separation device comprising a filter selection / mixing circuit for mixing and outputting. 2. The motion detection circuit A is for a composite video signal,
2. The three-dimensional luminance signal color signal separation device according to claim 1, wherein motion detection is performed by using a difference between signals that are separated in the time direction and have the same phase of the carrier color signal. 3. The three-dimensional luminance signal color according to claim 1, wherein the inter-frame processing circuit calculates and outputs a second derivative in the time direction of the phase signal output from the phase detection circuit. Signal separation device. 4. A two-dimensional luminance signal color signal separation circuit for separating a luminance signal and a color signal by using a composite video signal as an input signal and using a signal in the same field as the signal of interest, and a field different from the signal of interest or A three-dimensional luminance signal color signal separation circuit that separates a luminance signal and a color signal using a frame signal, a phase detection circuit that detects the phase of a high frequency image signal, and a field between the phases or between frames or between two frames Of the carrier color signal of the input signal and the inter-frame difference signal of the low-frequency signal of the input signal and the carrier color signal of the high-frequency signal of the input signal are in phase and in the time direction. A motion detection circuit A for performing motion detection using a signal distant from the target, and a motion detection circuit for performing motion detection using the output of the determination circuit A and the output of the motion detection circuit A; A filter selection mixing circuit for switching or mixing the outputs of the two-dimensional luminance signal color signal separation circuit and the three-dimensional luminance signal color signal separation circuit according to the output of the output circuit. A three-dimensional luminance signal / color signal separation device for 5. The decision circuit A delays the first memory for delaying the phase signal by one frame period and the output of the first memory by a field period X which is 1/2 line less than half of one frame period. The second memory and the output of the second memory from the half of one frame period
A third memory which delays by a field period Y having many lines, and a judgment circuit C which outputs a signal C when the phase signal and the output of the first memory have the same phase relationship in which the carrier color signal is separated by one frame period. , The outputs of the first memory and the second memory are the field periods X of the carrier color signal.
A decision circuit B that outputs a signal B at the same time as a phase signal that is separated by a distance, and a signal D is output when the phase signal and the output of the third memory have a phase relationship that is separated by two frame periods of the carrier color signal. It is characterized by comprising a judging circuit D, and a judging circuit E which outputs a signal A when the signals C and D are output but the signal B is not output from the outputs of the judging circuit B, the judging circuit C and the judging circuit D. The three-dimensional luminance signal / color signal separation device according to claim 4. 6. The motion detecting circuit adopts the detection result of the motion detecting circuit A if the judging circuit A does not output the signal A, and the judging circuit A outputs the signal A. The three-dimensional luminance signal / color signal separation device according to claim 4, wherein if it is a moving image, it is determined. 7. A two-dimensional luminance signal color signal separation circuit for separating a luminance signal and a color signal using a composite video signal as an input signal and a signal in the same field as the signal of interest, and a field different from the signal of interest or A three-dimensional luminance signal color signal separation circuit that separates a luminance signal and a color signal using a frame signal, a phase detection circuit that detects the phase of a high-frequency video signal, and a state of a phase near the signal of interest of the phase. , A determination circuit F that determines whether there is a carrier color signal based on the output of the near phase extraction circuit, an inter-frame difference signal of the low frequency signal of the input signal, and a high level of the input signal. A motion amount detecting circuit that detects a motion amount using signals that are in phase with the carrier color signal of the range signal and that are separated in the time direction, and a variable that converts the output of the motion amount detecting circuit by the output of the determination circuit F. A motion detection circuit having a circuit, and filter selection for switching or mixing outputs of the two-dimensional luminance signal color signal separation circuit and the three-dimensional luminance signal color signal separation circuit according to the output of the conversion circuit. A three-dimensional luminance signal / color signal separation device comprising a mixing circuit. 8. The near phase extraction circuit comprises an arithmetic circuit for calculating the difference between the phase signals of the near signals in which the phase of the carrier color signal is inverted by one line or two lines of the signal of interest of the phase signal. 3. The method according to claim 7, wherein
-Dimensional luminance signal color signal separation device. 9. The converting circuit converts the output of the motion amount detecting circuit so as to increase the motion amount if the output of the judging circuit F indicates that there is a carrier color signal, and the judging circuit. If the output of F indicates that there is no carrier color signal,
8. The three-dimensional luminance signal / color signal separation device according to claim 7, wherein the output of the motion amount detection circuit is converted so as to reduce the motion amount.