JP2001119718A - Motion detector for video signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize motion detection for a color signal with high accuracy without being affected by a noise and a horizontal contour component. SOLUTION: The motion detector is provided with a 1st band-pass filter, a 1st 1-frame delay means, a 2nd band-pass filter, a 2nd 1-frame delay means, a 3rd band-pass filter, a 3rd 1-frame delay means, a 4th band-pass filter, a 1st subtractor means, a 2nd subtractor means, a 3rd subractor means, a 1st absolute value detection means, a 5th band-pass filter, a 2nd absolute value detection means, a 1st low pass filter, a 3rd absolute value detection means, a 5th subtractor means, a noise quantity detection means, a 2nd adjustment means, a 2nd comparison means, a 1st adjustment means, a multiplier means, a 4th subtractor means, a 3rd adjustment means and a 1st comparison means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal motion detecting device which operates in response to a video signal motion.

[0002]

2. Description of the Related Art A conventional television signal motion detecting circuit is disclosed in Japanese Patent Application Laid-Open No. 1-259694. FIG. 10 shows a block diagram of a conventional video signal motion detection circuit. In FIG. 10, detection devices 25, 27, 30, 32, and 33 that compare the absolute values of the first and second difference values SB10 and SB20 and detect a change in the color signal included in the color video signal SVD are provided. Provide. That is, using the detection devices 25, 27, 30, 32, and 33, the difference value S between the color video signals SVD and SF2 one frame before and after the output signal SF1 of the first frame memory 2 is obtained.
By comparing the absolute values of B10 and SB20, a change in a color signal included in the color video signal SVD is detected. Thus, the movement of the color video signal SVD can be detected with high sensitivity.
This circuit compares the absolute value of the difference value between the current color video signal and the color video signal one frame before and after one frame, and detects a change in the color signal included in the color video signal, thereby achieving high-sensitivity color. The movement of the video signal can be detected.

[0003]

However, in the above configuration, even if the horizontal contour portion of the video signal is stationary, it may be judged as a moving image due to the influence of subtle jitter or noise between frames. Or a slow motion that makes the difference between frames extremely small cannot be detected and processed as a still image, or a misjudgment occurs when the video signal contains much noise. was there.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a motion detection apparatus for a video signal according to the present invention separates a color carrier frequency band from an input video signal and outputs a color carrier frequency band signal. One band-pass filter, first one-frame delay means for delaying the input video signal by one frame period, and separating a color carrier frequency band from the video signal delayed by one frame by the first one-frame delay means. A second band-pass filter for outputting a chrominance carrier frequency band signal delayed by one frame, and a second one-frame delay for further delaying the video signal delayed by one frame by the first one-frame delay unit for one frame period Means,
A third band-pass filter for separating a chrominance carrier frequency band from the video signal delayed by two frames by the second one-frame delay unit and outputting a chrominance carrier frequency band signal delayed by two frames; A third one-frame delay unit for further delaying the video signal delayed by two frames by the delay unit for one frame period, and a chrominance carrier frequency band separated from the video signal delayed by three frames by the third one-frame delay unit. A fourth bandpass filter for outputting a frame delayed color carrier frequency band signal,
A first subtraction for subtracting the color carrier frequency band signal delayed by one frame separated by the second band pass filter from the color carrier frequency band signal separated by the first band pass filter and outputting a carrier color signal; Means for subtracting the three-frame delayed color carrier frequency band signal separated by the fourth band-pass filter from the two-frame delayed color carrier frequency band signal separated by the third band-pass filter; Second subtraction means for outputting the output of the second subtraction means from the output of the first subtraction means, and detecting the movement of the carrier color signal between frames; and A first absolute value detecting means for obtaining an absolute value of an output of the subtracting means, and a fifth absolute value detecting means for separating an arbitrary frequency band from the input video signal and outputting an arbitrary frequency band signal. A band-pass filter; a second absolute value detecting means for obtaining an absolute value of an output of the fifth band-pass filter; and an arbitrary frequency band further separated from an output of the second absolute value detecting means. A first low-pass filter that outputs a frequency band signal of the following, a third absolute value detection unit that receives an output of the first subtraction unit as a carrier color signal and takes an absolute value thereof, and an output of the first low-pass filter A fifth subtraction means for subtracting the output signal of the third absolute value detection means from the output signal to output a horizontal contour component of a luminance signal, and a noise quantity detection for detecting a noise quantity from an input video signal and outputting the result Means, second adjustment means for adjusting a value from the comparison value for motion detection 1 to the comparison value for motion detection N inputted according to the output of the noise amount detection means, and the output of the fifth subtraction means. Signal and said second key A second comparing means for comparing the output value of the means and outputting a value corresponding to the comparison result as a luminance signal horizontal contour component detection result; and a video contour adjustment value input according to the output of the noise amount detecting means. First adjusting means for adjusting, multiplying means for multiplying the output of the second comparing means and the output of the first adjusting means and outputting the result, and the output of the first absolute value detecting means A fourth subtraction means for subtracting the output of the multiplication means from the signal and outputting the result; and a video horizontal contour detection comparison value 1 to a video horizontal contour detection comparison value N inputted according to the output of the noise amount detection means. Third adjusting means for adjusting the value of
And a first comparing means for comparing an output signal of the subtracting means with an output value of the third adjusting means and outputting a value corresponding to the comparison result as a color signal motion detection result. With the above-described configuration, erroneous determination of motion detection can be prevented by performing motion detection over three frames and using the video horizontal contour detection result and the amount of noise of the video signal to determine the motion detection. Signal motion detection can be performed.

[0005]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a video signal motion detecting apparatus according to a first embodiment of the present invention. As shown in FIG. 1, the present embodiment employs a BPF 4 as a first band-pass filter for outputting a color carrier frequency band signal, and a frame as a first one-frame delay unit for delaying a video signal for one frame period. Memory 1
BPF5 which is a second band-pass filter for outputting a color carrier frequency band signal delayed by one frame, and frame memory 2 which is a second one-frame delay means for further delaying the video signal delayed by one frame for one frame period When,
A BPF 6 as a third band-pass filter for outputting a color carrier frequency band signal delayed by two frames, a subtractor 8 as a first subtraction unit, and a subtractor 9 as a second subtraction unit
A subtractor 10 as a third subtraction unit, an ABS 11 as a first absolute value detection unit, a subtractor 12 as a fourth subtraction unit, and a comparator 13 as a first comparison unit. Consists of The operation of the motion detection apparatus for a video signal configured as described above will be described. The BPF 4 receives the input video signal and separates the chrominance carrier frequency band signal therefrom. The separated signal includes the carrier chrominance signal of the current frame and the luminance signal belonging to the frequency band. Next, the frame memory 1 receives the input video signal and delays it by one frame. Next, the BPF 5 receives the video signal delayed by one frame from the frame memory 1 and separates the color carrier frequency band signal. The separated signal includes a carrier chrominance signal delayed by one frame and a luminance signal belonging to the frequency band. Next, the frame memory 2 receives the output from the frame memory 1 and delays it by one frame. That is, the signal output from the frame memory 2 is a video signal delayed by two frames. Next, the BPF 6 receives the output from the frame memory 2 and separates the color carrier frequency band signal. The separated signal includes a carrier chrominance signal delayed by two frames and a luminance signal belonging to the frequency band. Next, the subtractor 8 receives the carrier color signal of the current frame output from the BPF 4 and the luminance signal belonging to the frequency band, the carrier color signal delayed by one frame output from the BPF 5 and the luminance signal belonging to the frequency band, BPF from output of BPF4
5 is subtracted. This subtraction is performed for the purpose of extracting the carrier chrominance signal by canceling out the still luminance signal by utilizing the interleaving property of the NTSC signal. However, the still luminance signal is subtracted due to noise or fluctuation of the video signal. Leaks in the results. Next, in the subtractor 9,
The carrier color signal delayed by two frames and the luminance signal belonging to the frequency band output from the BPF 6 and the carrier color signal delayed by one frame and the luminance signal belonging to the frequency band output from the BPF 5 are received. Subtract the output of. This subtraction is performed in the same manner as the subtractor 8 in NT
The purpose is to extract the carrier chrominance signal by canceling out the still luminance signal by using the interleaving property of the SC signal. However, as described above, the luminance signal that has stopped due to noise or the fluctuation of the video signal is subtracted. Come out and leak. Next, in the subtractor 10, the carrier color signal extracted from the video signal of the current frame output from the subtractor 8 and the video signal delayed by one frame, the video signal delayed by one frame output from the subtractor 9 and 2 Upon receiving the carrier color signal extracted from the frame-delayed video signal, the output of the subtracter 9 is subtracted from the output of the subtractor 8. This subtraction is performed for the purpose of extracting the movement of the carrier color signal between frames as a signal. If there is no movement of the carrier color signal between frames, 0 is output, and if there is any movement, a result corresponding to the movement is output. . However, as described above, since the luminance signal leaked due to noise or fluctuation is mixed in the signal used for the subtracter 10 in addition to the carrier chrominance signal, a stationary luminance signal that should not be output normally is generated. The output of the subtractor 10 is mixed. Next, the ABS 11 receives the output of the subtractor 10 and takes its absolute value. This is because the output result of the subtractor 10 includes a negative value, so that the subsequent calculation is easy. Next, the subtractor 12 receives the output of the ABS 11 and the input video contour signal, and subtracts the video contour signal from the output of the ABS 11. This is performed for the purpose of extracting only the original motion component as a motion signal by subtracting the contour signal since the luminance signal leaking due to the above-described noise or fluctuation contains a particularly large amount of the contour signal component. is there. Next, the comparator 13 receives the motion signal output from the subtractor 13 and the input motion detection comparison value 1 to the motion detection comparison value N, compares them, and outputs a signal corresponding to the comparison result. Output. This comparison will be described with reference to FIG. Assuming that the comparison value 2 is larger than the comparison value 1, the comparison value 3 is larger than the comparison value 2, and the comparison value N is the largest, the output from the subtractor 12 becomes the comparison value 1
If it is smaller than 0, it outputs 0 to make it stationary, and if the output from the subtractor 12 is larger than the comparison value 1 and smaller than the comparison value 2, it outputs 1 to make the color signal motion level 1, and then the subtractor This is because when the output from 12 is larger than the comparison value N, N is output and output as the color signal motion level N.
This is because if this motion detection result is applied to three-dimensional YC separation or the like, signal processing according to the motion level can be performed. As described above, highly accurate video signal color motion detection can be performed.

In this embodiment, all components are configured by hardware, but all or a part of these components may be configured by software in a microcomputer. It is not limited to form.

(Embodiment 2) FIG. 2 is a block diagram showing a motion detection apparatus for a video signal according to a second embodiment of the present invention. As shown in FIG. 2, in the present embodiment, a first band-pass filter 4 for outputting a color carrier frequency band signal and a frame memory 1 as first one-frame delay means for delaying a video signal for one frame period. A second band-pass filter 5 that outputs a color carrier frequency band signal delayed by one frame, a frame memory 2 that is a second one-frame delay unit that further delays the video signal delayed by one frame for one frame period, Third bandpass filter 6 for outputting a chrominance carrier frequency band signal delayed by two frames
A frame memory 3 serving as third one-frame delay means for further delaying the video signal delayed by two frames for one frame period, a fourth band-pass filter 7 for outputting a color carrier frequency band signal delayed by three frames, Subtractor 8 as first subtraction means and subtractor 9 as second subtraction means
A subtractor 10 as a third subtraction unit, an ABS1 as a first absolute value detection unit, a subtractor 12 as a fourth subtraction unit, and a comparator 13 as a first comparison unit. Consists of The operation of the motion detection apparatus for a video signal configured as described above will be described.

In FIG. 2, parts performing the same operations as in FIG. 1 are denoted by the same reference numerals, and description thereof is omitted. Frame memory 3
Receives the output from the frame memory 2 and delays it by one frame. That is, the output from the frame memory 3 is a video signal delayed by three frames. Next, the BPF 7 receives the output from the frame memory 3 and separates the color carrier frequency band signal. The separated signal includes a carrier chrominance signal delayed by three frames and a luminance signal belonging to the frequency band. Next, in the subtracter 9, the carrier color signal of the video signal delayed by two frames output from the BPF 6 and the luminance signal belonging to the frequency band, and the carrier color signal delayed by three frames output from the BPF 7 and the luminance belonging to the frequency band are output. Upon receiving the signal, the output of BPF6 is subtracted from the output of BPF7.

In the present embodiment, by performing motion detection over three frames, it is possible to detect very slow motion, which was difficult with a conventional motion detection circuit, and to realize highly accurate motion detection. Can be done.

In this embodiment, all components are configured by hardware, but all or some of these components may be configured by software in a microcomputer. It is not limited to form.

(Embodiment 3) FIG. 3 is a block diagram showing an apparatus for detecting a horizontal contour component of a video signal according to a third embodiment of the present invention. As shown in FIG. 3, in the present embodiment, a BPF 21 serving as a fifth band-pass filter that outputs a color carrier frequency band signal, an LPF 23 serving as a first low-pass filter, and a second absolute value detecting unit are used. A
BS22 and ABS24 as third absolute value detecting means
, A subtracter 5 as fifth subtraction means, and a comparator 26 as second comparison means. The operation of the apparatus for detecting a horizontal contour component of a video signal configured as described above will be described. The BPF 21 receives the input video signal and separates the chrominance carrier frequency band signal therefrom. The separated signal includes the carrier chrominance signal of the current frame and the luminance signal belonging to the frequency band. Next, in ABS22, BPF
21 and takes its absolute value. This is BPF21
Since the output result of includes a negative value, the easiness of the subsequent calculation is taken into consideration. Next, in LPF23, ABS
In response to the output of No. 22, an arbitrary frequency band is separated, and a separated frequency band signal is output. This is for the purpose of removing noise components, but the LPF 23 may be passed. Next, the ABS 24 receives the input carrier color signal and takes its absolute value. This is to unify the polarities in the next-stage subtractor. Next, the subtracter 25 receives the output of the LPF 23 and the output of the ABS 24,
The output of ABS 24 is subtracted from the output of # 3. This subtraction is performed for the purpose of extracting the carrier chrominance signal from the chrominance carrier frequency band signal and extracting the luminance signal horizontal contour component. Next, the comparator 26
Receives the luminance signal horizontal contour component output from the subtractor 25 and the input video horizontal contour detection comparison value 1 to the video horizontal contour detection comparison value N, compares these values, and compares the values. The corresponding value is output as a luminance signal horizontal contour component detection result. This comparison will be described with reference to FIG. If the comparison value 2 is larger than the comparison value 1, the comparison value 3 is larger than the comparison value 2, and the comparison value N is the largest, 0 is output if the output from the subtractor 25 is smaller than the comparison value 1. This is set to the horizontal contour level 0, and then the subtractor 25
Is larger than the comparison value 1 and smaller than the comparison value 2, 1 is output to be the horizontal contour level 1, and then the subtractor 25
Is greater than the comparison value N, N is output and output as the horizontal contour level N. This is because if this horizontal contour component detection result is applied to three-dimensional YC separation or the like, signal processing according to the horizontal contour component can be performed.

In this embodiment, by removing the carrier chrominance signal component from the horizontal contour component, it is possible to realize the luminance signal horizontal contour component detection with high accuracy, which was difficult in the prior art.

In the present embodiment, all components are configured by hardware. However, all or some of these components may be configured by software in a microcomputer. It is not limited to form.

(Embodiment 4) FIG. 4 is a block diagram showing a video signal motion detecting apparatus according to a fourth embodiment of the present invention. As shown in FIG. 4, in the present embodiment, a BPF 4 which is a first band-pass filter for outputting a color carrier frequency band signal, and a frame which is a first one-frame delay unit for delaying a video signal by one frame period. Memory 1
BPF5 which is a second band-pass filter for outputting a color carrier frequency band signal delayed by one frame, and frame memory 2 which is a second one-frame delay means for further delaying the video signal delayed by one frame for one frame period When,
A BPF 6 as a third band-pass filter for outputting a color carrier frequency band signal delayed by two frames, a subtractor 8 as a first subtraction unit, and a subtractor 9 as a second subtraction unit
A subtractor 10 as a third subtraction unit, an ABS 11 as a first absolute value detection unit, a subtractor 12 as a fourth subtraction unit, and a comparator 13 as a first comparison unit. BPF21, which is a fifth bandpass filter for outputting a color carrier frequency band signal, and L, which is a first lowpass filter
PF23 and ABS22 as second absolute value detecting means
An ABS 24 serving as third absolute value detecting means, a subtractor 5 serving as fifth subtracting means, a comparator 26 serving as second comparing means, and a multiplier 31 serving as first multiplying means. Consists of The operation of the motion detection apparatus for a video signal configured as described above will be described. In FIG. 4, FIGS.
The same reference numerals are given to the parts that perform the same operations as described above, and description thereof will be omitted. The multiplier 31 receives the output from the comparator 26 and the input adjustment value, multiplies them, and outputs the result.
This is done by weighting the horizontal contour component detection result output from the comparator 26, for example, by making the adjustment value larger to make the color motion detection result more stationary, or by making the adjustment value smaller, It becomes possible to make the detection result smaller than the movement.

In the present embodiment, by removing the horizontal contour component from the color motion detection, it is possible to perform highly accurate video signal color motion detection which is not affected by the horizontal contour component, which is difficult with the conventional motion detection circuit. I can do it.

In the present embodiment, all components are configured by hardware. However, all or some of these components may be configured by software in a microcomputer. It is not limited to form.

(Embodiment 5) FIG. 5 is a block diagram of a video signal motion detecting apparatus according to a fifth embodiment of the present invention. As shown in FIG. 5, in the present embodiment, a first band-pass filter 4 for outputting a chrominance carrier frequency band signal and a frame memory 1 as first one-frame delay means for delaying a video signal for one frame period. A second band-pass filter 5 that outputs a color carrier frequency band signal delayed by one frame, a frame memory 2 that is a second one-frame delay unit that further delays the video signal delayed by one frame for one frame period, Third bandpass filter 6 for outputting a chrominance carrier frequency band signal delayed by two frames
A frame memory 3 serving as third one-frame delay means for further delaying the video signal delayed by two frames for one frame period, a fourth band-pass filter 7 for outputting a color carrier frequency band signal delayed by three frames, Subtractor 8 as first subtraction means and subtractor 9 as second subtraction means
A subtractor 10 as a third subtraction unit, an ABS1 as a first absolute value detection unit, a subtractor 12 as a fourth subtraction unit, and a comparator 13 as a first comparison unit. BPF21, which is a fifth bandpass filter for outputting a color carrier frequency band signal, and LP, which is a first lowpass filter
F23, ABS22 as second absolute value detection means,
ABS 24 serving as third absolute value detecting means, subtractor 5 serving as fifth subtracting means, and comparator 2 serving as second comparing means.
6 and a multiplier 31 as first multiplication means. In FIG. 5, portions performing the same operations as in FIGS. 2 and 4 are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, by performing motion detection over three frames, it is possible to detect a very slow motion which was difficult with the conventional motion detection circuit. By removing, it is possible to perform highly accurate video signal color motion detection that is not affected by horizontal contour components, which is difficult with a conventional motion detection circuit.

In the present embodiment, all components are configured by hardware, but all or a part of these components may be configured by software in a microcomputer. It is not limited to form.

(Embodiment 6) FIG. 6 is a block diagram showing a motion detection apparatus for a video signal according to a sixth embodiment of the present invention. As shown in FIG. 6, in the present embodiment, a BPF 4 which is a first band-pass filter for outputting a color carrier frequency band signal, and a frame which is a first one-frame delay unit for delaying a video signal by one frame period Memory 1
BPF5 which is a second band-pass filter for outputting a color carrier frequency band signal delayed by one frame, and frame memory 2 which is a second one-frame delay means for further delaying the video signal delayed by one frame for one frame period When,
A BPF 6 as a third band-pass filter for outputting a color carrier frequency band signal delayed by two frames, a subtractor 8 as a first subtraction unit, and a subtractor 9 as a second subtraction unit
A subtractor 10 as a third subtraction unit, an ABS 11 as a first absolute value detection unit, a subtractor 12 as a fourth subtraction unit, and a comparator 13 as a first comparison unit. BPF21, which is a fifth bandpass filter for outputting a color carrier frequency band signal, and L, which is a first lowpass filter
PF23 and ABS22 as second absolute value detecting means
An ABS 24 serving as third absolute value detecting means, a subtractor 5 serving as fifth subtracting means, a comparator 26 serving as second comparing means, and a multiplier 31 serving as first multiplying means. It comprises a noise amount detecting device 41 and a first adjusting device 42. The operation of the motion detection apparatus for a video signal configured as described above will be described. In FIG. 6, portions performing the same operations as those in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted. The noise amount detection device 41 receives the input video signal, and outputs a detection result according to the noise amount included in the video signal. As a means for detecting the amount of noise, there is a method of differentiating an arbitrary period of the video signal equivalent pulse period and integrating the result, and other methods. Next, the adjustment device 42 receives the output of the noise amount detection device 41 and the input adjustment value, adjusts the input adjustment value according to the output result of the noise amount detection device 41, and outputs the result. As the adjusting means, a technique such as AND, multiplication, addition / subtraction, or division can be considered. This is performed for the purpose of preventing erroneous detection of motion that is originally stationary due to noise when the amount of noise included in the video signal is large.

In the present embodiment, by adjusting the adjustment value in accordance with the amount of noise included in the video signal, it is possible to obtain a highly accurate video signal color motion which is not affected by noise, which is difficult with a conventional motion detection circuit. Detection can be performed.

In the present embodiment, all components are configured by hardware. However, all or a part of these components may be configured by software in a microcomputer. It is not limited to form.

(Embodiment 7) FIG. 7 is a block diagram of a video signal motion detecting apparatus according to a seventh embodiment of the present invention. As shown in FIG. 7, in the present embodiment, a BPF4 that is a first bandpass filter that outputs a color carrier frequency band signal, and a frame that is a first one-frame delay unit that delays a video signal by one frame period Memory 1
BPF5 which is a second band-pass filter for outputting a color carrier frequency band signal delayed by one frame, and frame memory 2 which is a second one-frame delay means for further delaying the video signal delayed by one frame for one frame period When,
A BPF 6 as a third band-pass filter for outputting a color carrier frequency band signal delayed by two frames, a subtractor 8 as a first subtraction unit, and a subtractor 9 as a second subtraction unit
A subtractor 10 as a third subtraction unit, an ABS 11 as a first absolute value detection unit, a subtractor 12 as a fourth subtraction unit, and a comparator 13 as a first comparison unit. BPF21, which is a fifth bandpass filter for outputting a color carrier frequency band signal, and L, which is a first lowpass filter
PF23 and ABS22 as second absolute value detecting means
An ABS 24 serving as third absolute value detecting means, a subtractor 5 serving as fifth subtracting means, a comparator 26 serving as second comparing means, and a multiplier 31 serving as first multiplying means. It comprises a noise amount detection device 41, a first adjustment device 42, and a second adjustment device 43. The operation of the motion detection apparatus for a video signal configured as described above will be described. In FIG. 7, parts performing the same operations as in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted. The adjustment device 43 receives the output of the noise amount detection device 41 and the input comparison value 1 for motion detection to the comparison value N for motion detection, and inputs the motion detection comparison value N according to the output result of the noise amount detection device 41. Adjust the comparison value and output. As the adjusting means, a technique such as AND, multiplication, addition / subtraction, or division can be considered.
This is performed for the purpose of preventing erroneous detection of motion that is originally stationary due to noise when the amount of noise included in the video signal is large.

In this embodiment, a high-precision image which is not affected by noise, which is difficult with a conventional motion detection circuit, is adjusted by adjusting the motion detection comparison value according to the amount of noise included in the video signal. Signal color motion detection can be performed.

In this embodiment, all components are configured by hardware, but all or a part of these components may be configured by software in a microcomputer. It is not limited to form.

(Embodiment 8) FIG. 8 is a block diagram showing a motion detection apparatus for a video signal according to an eighth embodiment of the present invention. As shown in FIG. 8, in the present embodiment, a BPF 4 which is a first band-pass filter for outputting a color carrier frequency band signal, and a frame which is a first one-frame delay unit for delaying a video signal by one frame period Memory 1
BPF5 which is a second band-pass filter for outputting a color carrier frequency band signal delayed by one frame, and frame memory 2 which is a second one-frame delay means for further delaying the video signal delayed by one frame for one frame period When,
A BPF 6 as a third band-pass filter for outputting a color carrier frequency band signal delayed by two frames, a subtractor 8 as a first subtraction unit, and a subtractor 9 as a second subtraction unit
A subtractor 10 as a third subtraction unit, an ABS 11 as a first absolute value detection unit, a subtractor 12 as a fourth subtraction unit, and a comparator 13 as a first comparison unit. BPF21, which is a fifth bandpass filter for outputting a color carrier frequency band signal, and L, which is a first lowpass filter
PF23 and ABS22 as second absolute value detecting means
An ABS 24 serving as third absolute value detecting means, a subtractor 5 serving as fifth subtracting means, a comparator 26 serving as second comparing means, and a multiplier 31 serving as first multiplying means. It comprises a noise amount detecting device 41, a first adjusting device 42, a second adjusting device 43, and a third adjusting device 44.
The operation of the motion detection apparatus for a video signal configured as described above will be described. In FIG. 8, parts performing the same operations as in FIG. 7 are denoted by the same reference numerals, and description thereof will be omitted. In the adjusting device 44, the output of the noise amount detecting device 41 and the input comparison value 1 for horizontal contour detection are compared with the comparison value N for horizontal contour detection.
In response to the above, the comparison value for horizontal contour detection input according to the output result of the noise amount detection device 41 is adjusted and output. As the adjusting means, a technique such as AND, multiplication, addition / subtraction, or division can be considered. This is performed for the purpose of preventing, when the amount of noise contained in the video signal is large, erroneous detection of a part which is not originally a horizontal contour component as a horizontal contour component due to noise.

In the present embodiment, a highly accurate video signal color motion detection that is not affected by noise is performed by adjusting the comparison value for horizontal contour detection in accordance with the amount of noise included in the video signal. Can be done.

In the present embodiment, all components are configured by hardware, but all or a part of these components may be configured by software in a microcomputer. It is not limited to form.

[Brief description of the drawings]

FIG. 1 is a block diagram of a motion detection device for a video signal according to a first embodiment of the present invention;

FIG. 2 is a block diagram of a motion detection apparatus for a video signal according to a second embodiment of the present invention;

FIG. 3 is a block diagram of an apparatus for detecting a horizontal contour component of a video signal according to a third embodiment of the present invention;

FIG. 4 is a block diagram of a motion detection apparatus for a video signal according to a fourth embodiment of the present invention;

FIG. 5 is a block configuration diagram of a video signal motion detection device according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram of a video signal motion detection device according to a sixth embodiment of the present invention;

FIG. 7 is a block diagram of a video signal motion detection device according to a seventh embodiment of the present invention;

FIG. 8 is a block diagram of a motion detection apparatus for a video signal according to an eighth embodiment of the present invention;

FIG. 9 is a waveform chart showing operations of motion detection comparison and horizontal contour component comparison of a video signal according to the first and third embodiments of the present invention.

FIG. 10 is a block diagram of a conventional video signal motion detection device.

[Explanation of symbols]

 1, 2, 3 Frame memory 4, 5, 6, 7, 21 Band pass filter 8, 9, 10, 12, 25 Subtractor 11, 22, 24 Absolute value circuit 13, 26 Comparator 23 Low pass filter 31 Multiplier 41 Noise amount detection device 42, 43, 44 adjustment device

Claims (8)

[Claims] 1. A first band-pass filter for separating a color carrier frequency band from an input video signal and outputting a color carrier frequency band signal, and a first band-pass filter for delaying the input video signal by one frame period. One-frame delay means, a second band-pass filter for separating a color carrier frequency band from the video signal delayed by one frame by the first one-frame delay means, and outputting a color carrier frequency band signal delayed by one frame; A second one-frame delay unit for further delaying the video signal delayed by one frame by the first one-frame delay unit for one frame period, and a color carrier frequency from the video signal delayed by two frames by the second one-frame delay unit A third band-pass filter for separating a band and outputting a chrominance carrier frequency band signal delayed by two frames; First subtraction means for subtracting the one-frame-delayed color carrier frequency band signal separated by the second band-pass filter from the color carrier frequency band signal separated by the filter, and outputting a carrier color signal; Subtracting the one-frame-delayed color carrier frequency band signal separated by the second band-pass filter from the two-frame-delayed color carrier frequency band signal separated by the band-pass filter to output a carrier color signal. Subtraction means; third subtraction means for subtracting the output of the second subtraction means from the output of the first subtraction means to detect movement between frames of the carrier chrominance signal; and output of the third subtraction means A first absolute value detecting means for calculating an absolute value of the first absolute value, a fourth subtracting means for subtracting and outputting an input video contour signal from an output signal of the first absolute value detecting means, A first comparing unit that compares the output signal of the subtracting unit with the input comparison value for motion detection 1 to the comparison value for motion detection N and outputs a value corresponding to the comparison result as a color signal motion detection result; A motion detection device for a video signal, comprising: 2. The method according to claim 1, wherein the second one-frame delay means performs
Third one-frame delay means for further delaying the frame-delayed video signal by one frame period; and a color carrier frequency band separated from the video signal delayed by three frames by the third one-frame delay means, and delayed by three frames. 2. The video signal motion detecting apparatus according to claim 1, wherein a motion is detected over three frames by adding a fourth band-pass filter for outputting a carrier frequency band signal. 3. A fifth bandpass filter for separating an arbitrary frequency band from an input video signal and outputting an arbitrary frequency band signal, and a fifth bandpass filter for obtaining an absolute value of an output of the fifth bandpass filter. 2, a first low-pass filter for further separating an arbitrary frequency band from the output of the second absolute value detecting means and outputting a separated frequency band signal, and an input carrier color signal And a fifth subtraction for subtracting an output signal of the third absolute value detecting means from an output of the first low-pass filter and outputting a horizontal contour component of a luminance signal. Means for comparing the output signal of the fifth subtraction means with the input video horizontal contour detection comparison value 1 to the video horizontal contour detection comparison value N, and assigning a value corresponding to the comparison result to the luminance signal horizontal contour. Output as component detection result A horizontal contour component detection device for a video signal, comprising: a second comparison unit. 4. A multiplying means which receives an output of the second comparing means according to claim 3 as an input, multiplies the inputted image contour adjustment value, and outputs the result, and a first subtraction according to claim 1. The output of the means is used as the input of the third absolute value detection means as a carrier color signal, and the output of the multiplication means is used as the input of the fourth subtraction means as an image contour signal. The video signal motion detection device according to claim 1 or claim 3, wherein 5. An apparatus according to claim 2, wherein an output of said first subtraction means is input as a carrier color signal to said third absolute value detection means, and motion is detected over three frames. Item 5. A motion detection device for a video signal according to Item 4. 6. A noise amount detecting means for detecting a noise amount from an input video signal and outputting the result, and a first adjusting means for adjusting the input image contour adjustment value according to an output of the noise amount detecting means. 6. The apparatus according to claim 4, further comprising an adjusting means. 7. A method according to claim 1, further comprising adding a second adjusting unit for adjusting a value from the comparison value for motion detection 1 to the comparison value for motion detection N input according to the output of the noise amount detection unit. 7. A video signal motion detecting apparatus according to claim 6. 8. A third adjusting means for adjusting a value from a video horizontal contour detecting comparison value 1 to a video horizontal contour detecting comparison value N inputted according to an output of said noise amount detecting means. The video signal motion detecting device according to claim 7, wherein: