JPH03220889A - Moving information signal detection circuit - Google Patents

Abstract

PURPOSE:To detect a moving information signal with high accuracy by providing an adaptive conversion circuit receiving an output signal of a time space processing circuit and an output signal of an edge detection circuit and converting an output signal of the time space processing circuit in response to an output signal level of the edge detection circuit. CONSTITUTION:A movement detection signal with a luminance component subject to bit compression and a movement detection signal with a chrominance component are synthesized by a synthesis circuit 15, and an output signal is inputted to a noise elimination circuit 16 to eliminate noise in the moving signal. Moreover, a color television signal inputted from an input terminal 2 is fed further to an edge detection circuit 19. The edge detection circuit 19 detects an edge of a picture to output an edge detection signal l. Then an output signal of a time space processing circuit 17 and the edge detection signal l are inputted to an adaptive conversion circuit 18. The adaptive conversion circuit 18 applies conversion processing in response to the level of the edge detection signal lto a moving information signal subject to time space processing to eliminate undesired moving information onto the edge by the time space processing. Thus, mis-detection of the edge is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a signal processing circuit for television signals, and in particular to a motion information signal detection method suitable for creating a signal for controlling a motion adaptive signal processing circuit. Regarding circuits.

[Conventional technology]

A motion adaptive signal processing circuit that processes television signals according to the movement of the image is very effective for obtaining high-quality images. For image signals, the luminance signal and chrominance signal are separated using the signal correlation between multiple frames, and for video signals, the luminance signal and chrominance signal are separated using the signal correlation between multiple lines. By performing separation, it is possible to suppress the occurrence of dot interference, cross color, etc. Regarding interpolation of scanning lines, an interpolation signal is created using signals of adjacent fields for a still image signal, and an interpolation signal is created using a signal of one field for a moving image signal.

This makes it possible to prevent line flicker from occurring and improve vertical resolution.

This motion adaptive signal processing circuit is effective when the motion of an image is accurately detected. However, if the detection of image movement is not accurate, for example, moving image processing is applied to a still image, or still image processing is applied to a moving image, which causes image quality deterioration.

Japanese Patent Application Laid-Open No. 63-90987 is a conventional example of a motion detection circuit that has fewer errors in motion detection even for fast-moving images.

A circuit block diagram of the above conventional example is shown in FIG.
In the figure, 2 is an input terminal, 3 is an l frame memory, 4.
12 is a subtraction circuit, and 5 is a low-pass filter circuit (hereinafter referred to as L).
(denoted as PF).

6.13 is an absolute value circuit, 7.14 is a nonlinear conversion circuit, 8
is a band pass filter circuit (hereinafter referred to as BPF), 9 is an automatic color saturation control amplifier circuit (hereinafter referred to as ACC amplifier circuit), 10 is a demodulation circuit, 11 is a 2-frame frame memory, and 15 is a synthesis circuit. The circuit 17 is a spatio-temporal processing circuit. A digitalized, for example, NTSC system composite color television signal (hereinafter referred to as a color television signal) is input to the input terminal 2. This is delayed by one frame period in the one frame memory 3, and a one frame difference signal is created by the subtraction circuit 4. Here, when the difference signal between one frame and one frame is zero, it is assumed to be a still image, and when it is not zero, it is assumed to be a moving image, so that movement of the image can be detected. However, in a color television signal, the luminance signal component is in the same phase between each frame, and the color signal component is in opposite phase, so the difference signal between each frame has color components in addition to the motion component. Contains signal components. Therefore, this color signal component is
It is removed at F5 and becomes a luminance component motion detection signal. Further, the absolute value circuit 6 removes the positive and negative polarities of the difference signal, and the motion detection signal of the luminance component detected through the absolute value circuit 6 is supplied to a nonlinear conversion circuit 87 for bit compression. The motion detection signal of the luminance component input to 7 is
If the input color television signal is quantized to 8 bits, for example, it will be an 8-bit signal as well. The nonlinear conversion circuit 7 compresses the 8-bit signal into, for example, a 4-bit signal to reduce the number of bits. Even in this case, the motion adaptive signal processing circuit can be switched in 16 steps, allowing for sufficiently smooth switching.

On the other hand, in this conventional example, movement of color components of an image is detected as follows. The ACC amplifier circuit 9 limits the band of the color television signal input from the input terminal 2 using the BPF 8 and extracts the signal in the color signal band.

It operates to keep the level of the burst signal included in the output signal of the BPF 8 constant, and outputs a color signal with a substantially constant amplitude in which fluctuations in the color signal level due to the frequency characteristics of the transmission path are corrected. After that, the demodulation circuit 10 performs color demodulation of the color signal, and the output terminal of the demodulation circuit 10 receives two color difference signals (R-Y
) and (B-Y) in a point-sequential manner, the phase of the 0-color subcarrier is inverted every frame, but the demodulation circuit 10 is configured to cancel out this inversion between frames. has been done. This demodulation time! The color signal band signal input to ilo includes high frequency components of the luminance signal in addition to the color signal. Therefore, the output terminal of the demodulation circuit 10 outputs a signal in which the high frequency components of the luminance signal are inverted from frame to frame.

The output signal of the demodulation circuit 10 is input to a two-frame memory 11 and delayed by two frame periods. Then, a subtraction circuit 12 creates a difference signal between two frames. Between two signals separated by two frame periods, both the high frequency components of the color signal and the luminance signal are in phase. Therefore, when the difference signal between two frames is zero, it is a still image, and when it is not zero, it is a moving image.

That is, this two-frame difference signal becomes a color component motion detection signal. After that, the positive and negative polarities of the difference signal are removed in the absolute value circuit 13, and the motion detection signal of the color component converted into an absolute value is bit compressed in the nonlinear conversion circuit 14 in the same way as the motion detection signal of the luminance component. The compressed motion detection signal of the luminance component and the motion detection signal of the color component are supplied to a synthesis circuit 15, and both signals are synthesized. The output signal of the synthesis circuit 15 is input to the spatio-temporal processing circuit 17, and the detection is performed so that motion that cannot be detected by the difference between frames, for example, motion in a fast-moving image or an image with a detailed pattern, is considered to be motion. The detected motion signal is expanded in the temporal and spatial directions, resulting in a motion information signal that prevents omissions in motion detection. Then, the motion information signal from the spatio-temporal processing circuit 17 is output to the output terminal 2.
It is output from o and used as a control signal for the motion adaptive signal processing circuit.

[Problem to be solved by the invention]

In the above conventional example, when the spatio-temporal processing circuit 17 stretches the motion signal and the area determined to have motion extends to the edge portion of the image, the edge portion is subjected to video processing,
There is a problem in that image quality deteriorates due to dot interference and flickering of one image.

SUMMARY OF THE INVENTION An object of the present invention is to provide a motion information signal detection circuit that suppresses erroneous detection of motion at edge portions caused by spatio-temporal processing and can perform more accurate detection.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a motion detection circuit that detects motion in an image, a spatio-temporal processing circuit that processes the detected motion in the temporal and spatial directions, and an edge detection circuit that detects edge portions of the image. A motion information detection circuit is composed of a detection circuit and an adaptive conversion circuit that transforms the spatiotemporally processed motion information according to the level of the detected edge.

[Effect]

The motion detection circuit detects the motion of an image using the difference signal between frames.The spatio-temporal processing circuit stretches the motion in the temporal and spatial directions.The edge detection circuit uses the correlation with surrounding pixels. to detect the edges of the image. The adaptive conversion circuit reduces the level of motion information at the edges. As a result, erroneous detection of motion at edge portions can be suppressed, and a motion information detection circuit with higher detection accuracy can be realized.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1st
In the figure, l is a motion detection circuit, 2 is an input terminal, and 3 is l
Frame memory, 4.12 is a subtraction circuit, 5 is LPF, 6
, 3 is an absolute value circuit, 7° 14 is a non-linear conversion circuit, 8 is an EPF, 9 is an ACC amplifier circuit, 10 is a demodulation circuit, 11
are 2 frame memories, 15 is a synthesis circuit, 16 is a noise removal circuit, 17 is a spatio-temporal processing circuit, 18 is an adaptive conversion circuit,
19 is an edge detection circuit.

A digitized, for example, color television signal is input to the input terminal 2 and stored in the one frame memory 3.

The subtraction circuit 4 obtains l frame difference signals.

The color signal component included in the difference signal between one frame is processed by LPF.
5 to create a motion detection signal of the luminance component. After that, the positive and negative polarities of the difference signal are removed using the absolute value port is6,
A nonlinear conversion circuit 7 performs bit compression.

On the other hand, the color television signal input from the input terminal 2 is band-limited by the BPF 8 to extract a signal in the color signal band, the ACC amplifier circuit 9 corrects the fluctuation in the level of the burst signal, and the demodulation port GIO performs color demodulation. A two-frame difference signal is created from the demodulated color signal by a two-frame memory 11 and a subtraction circuit 12. That is, a color component motion detection signal is obtained. Thereafter, the positive and negative polarities of the difference signal are removed by the absolute value port M113, and bit compression is performed by the nonlinear conversion circuit 14.

Then, a combining circuit 15 combines the bit-compressed luminance component motion detection signal and color component motion detection signal. and,
A noise removal circuit 16 that inputs the output signal of the synthesis circuit 15 to a noise removal circuit 16 to remove noise in the motion signal.
Now, the output signal of the noise removal circuit 16, which performs noise removal by taking advantage of the fact that there is no correlation between the motion detection signal caused by the noise pixel and the motion detection signal caused by the surrounding pixels, and prevents erroneous detection of motion due to noise. The motion signal from which noise has been removed is inputted to the spatio-temporal processing circuit 17 and expanded in the temporal and spatial directions to perform error-free motion determination even for fast-moving images and images with fine patterns.

Further, the color television signal input from the input terminal 2 is further supplied to an edge detection circuit 19. The edge detection circuit 19 detects edge portions of the image and outputs an edge detection signal α. Then, the output signal of the spatio-temporal processing circuit 17 and the edge detection signal a are converted into an adaptive conversion port lI! Enter 18. The adaptive conversion circuit 18 performs a conversion process on the motion information signal that has been subjected to the spatio-temporal processing in accordance with the level of the edge detection signal 2, and reduces unnecessary motion information extending to the edge portion by the spatio-temporal processing. This makes it possible to suppress erroneous detection of motion at edge portions. Then, the output signal of the adaptive conversion circuit 18 is outputted to the output terminal 20 as a motion information signal.
and used as a control signal for the motion adaptive signal processing circuit.

Next, an example of the detailed configuration and operation of the edge detection circuit will be explained using FIG. FIG. 2 is a block diagram showing the configuration of the edge detection circuit 19. In FIG. 2, 19 is an edge detection circuit, 2 is an input terminal, 21 is an LH (LH is one horizontal scanning period of a television signal) memory, 22 is a subtraction circuit, 23 is an LPF, 24 is an absolute value circuit, and 25 is an 26 is an output terminal of the bit compression circuit. The edge detection circuit 19 in FIG. 2 detects a vertical edge portion of one image by utilizing the correlation between vertically adjacent pixels within the same field. First, a color television signal input from the input terminal 2 is supplied to the IH memory 21 and delayed during IHH. Then, the input color television signal and the color television signal delayed by the IHH interval are input to the subtraction circuit 22 to obtain the difference between the two signals. If there is an edge part in the vertical direction within the same field, 1H at that pixel
A significant signal component occurs in the difference signal. Furthermore, if it is not an edge portion, the IH interleaving signal is zero, so the edge portion of the image can be detected by creating the IH interleaving signal. However, in the case of a color television signal, since the color signal components have opposite phases between lines, significant signal components also occur in the 1H difference signal in non-edge portions. Therefore, the LPF 23 removes the color signal component included in the IH intermittent signal. Thereafter, a bit compression circuit 25 removes the positive and negative polarities of the difference signal in an absolute value circuit 24.

The edge detection signal generated by the absolute value circuit 24 is compressed from 1, for example, 8 bits to 2 bits as a control signal for the adaptive conversion circuit 18. Then, the output signal of the bit compression circuit 25 is outputted from the output terminal 26 as an edge detection signal a.

In addition, the edge detection signal n generated by the edge detection circuit 19
In addition to the control signal of the adaptive conversion circuit 18, the motion detection circuit 1
It can also be used as a control signal for the nonlinear conversion circuit 7.14. When the detected motion signal is bit-compressed by the non-linear conversion circuits 7 and 14, the bit compression characteristic is such that, for example, when the edge level tomoe is large, the motion signal level is reduced! The bit compression characteristics are set such that the motion signal level is increased when the edge level a is small. This makes it possible to suppress erroneous detection of motion at edge portions that occurs before spatiotemporal processing.

Next, using FIGS. 3, 4, and 5, the adaptive conversion circuit 1
An example of the detailed configuration and operation of 8 will be explained.

3 and 4 are block diagrams showing the configuration of the adaptive conversion circuit 18, and FIG. 5 is a diagram showing an example of conversion characteristics of the adaptive conversion circuit. In FIGS. 3 and 4, 18 is an adaptive conversion circuit, 2.27 is an input terminal, 28°, 29.30.31 are conversion circuits with different conversion characteristics, and 33, 34, 35.3
6 is a constant multiplication circuit having a different constant, 32 is a selection circuit, and 19 is an edge detection circuit. Here, a configuration will be described in which the conversion characteristics of the adaptive conversion circuit 18 are switched in, for example, four ways. In FIG. 5, the horizontal axis indicates the motion information level input to the adaptive conversion circuit 18, the vertical axis indicates the output motion information level, and the conversion characteristics are as follows.

The output motion information can be expressed by multiplying the input motion information by a constant, that is, the conversion characteristic a is the characteristic in which the output motion information level is multiplied by 0 times the input motion information level, the characteristic is β times, and the characteristic C is γ
The characteristic d is the characteristic multiplied by six. First, input terminal 27
A conversion circuit converts the motion information signal input from 28.29.30
．． 31 respectively. Then, the input motion information is converted into a conversion characteristic a shown in FIG. 5 in the conversion circuit 28, a characteristic in the conversion circuit 29, and a characteristic C in the conversion circuit 30.
In the A cycle 1II31, each signal is converted using the characteristic d and output. Specifically, the conversion circuits 28, 29, 30, and 31 convert the constants α, β, γ, and δ into α>β> as shown in FIG.
Constant multiplier circuit set as γ>δ 33.34.35
．． By using 36, the conversion characteristics shown in FIG. 5 can be realized. After that, conversion mouth j! The 0 selection circuit 32 that inputs the output signals of 28, 29, 30, and 31 into the selection port 11132 selects one of the four input signals according to the level of the edge detection signal a detected by the edge detection circuit 19. For example, assume that the edge detection signal a has four levels (0, 1, 2, 3).

When the edge detection signal a is level O, the output signal of the conversion circuit 28 is selected, when it is level 1, the output signal of the conversion circuit 29 is selected, and when it is level 2, the output signal of the conversion circuit 29 is selected.

The selection circuit 32 is configured to select the output of the conversion circuit 30, and in the case of level 3, select the output of the conversion circuit 31. This makes it possible to realize an adaptive conversion circuit 18 that switches the conversion characteristics depending on the level of the edge detection signal a, and outputs motion information at a smaller level as the edge level a increases. Detection can be suppressed.

Here, conversion characteristics other than those shown in FIG.
By composition of 8.29.30,31.

For example, a characteristic where the output motion information level is smaller than the input motion information level by a certain amount as shown in FIG. 6, that is, the conversion characteristic a, can be set arbitrarily. Characteristics −α from
If the characteristic A is -β, the characteristic C is -γ, and the characteristic d is -δ, the conversion circuits 28, 29, 30, 3 in FIG.
This can be realized by using a constant subtraction circuit in which constants α, β, γ, and δ are set to α×β×γ<δ. Furthermore, the switching of characteristics is not limited to four stages, but can be arbitrarily set depending on the number of conversion circuits.

As described above, according to this embodiment, by suppressing erroneous detection of motion at edge portions caused by one-time spatiotemporal processing, a more accurate motion information signal can be detected.

Next, another embodiment of the adaptive conversion circuit 18 according to the present invention will be described with reference to FIG. 7. This embodiment is an example of a small-scale adaptive conversion circuit 18 that is composed of a coefficient generation circuit and a multiplication circuit. be. FIG. 7 is a block diagram of the adaptive conversion circuit 18 described in this embodiment. In Figure 7, 1
8 is an adaptive conversion circuit, 27 is an input terminal, 37 is a multiplication circuit,
38 is a coefficient generation circuit, 20 is an output terminal, and 19 is an edge detection circuit.

The conversion characteristics of the adaptive conversion circuit 18 in this embodiment are those shown in FIG. 5 shown in the previous embodiment. Edge conversion circuit 18
The edge detection signal level detected in is supplied to the coefficient generation circuit 38, and a coefficient corresponding to the edge level level is generated. and,
The multiplication circuit 37 multiplies the input motion information signal by the coefficient generated by the coefficient generation circuit 38. If the level of the edge detection signal is, for example, four levels (0, 1, 2, 3), the coefficient generation circuit 38, when the edge level is O, the coefficient α
, β□ at level 1, γ at level 2, and δ at level 3, the output terminal of the multiplier circuit 37 will produce exactly the same behavior as the adaptive conversion circuit shown in FIG. Information signals can be obtained.

Further, the conversion characteristics shown in FIG. 6 can be similarly realized by applying a subtraction circuit in place of the multiplication circuit 37.

As described above, according to this embodiment, as in the previous embodiment, a highly accurate motion information signal can be detected that suppresses false detection of motion occurring in edge portions, and the adaptive conversion circuit 18 is a smaller circuit than in the previous embodiment. It can be achieved at scale.

Next, another embodiment of the adaptive conversion circuit 18 according to the present invention will be described with reference to FIG. 8. This embodiment is an example of an adaptive conversion circuit 1s18 in which different conversion characteristics are realized by bit shifting. 8th rj! i is a block diagram of an adaptive conversion circuit 18 explained in this embodiment. In Figure 8, 18
is an adaptive conversion circuit, 27 is an input terminal, 32 is a selection circuit, 2
0 is an output terminal, and 19 is an edge detection circuit.0 In this embodiment, for example, when the output motion information signal switches between three characteristics of the input motion information signal: 1 times (not converted), 172 times, and 174 times. The configuration of is explained below.

Now, the input motion information signal is, for example, a 4-bit signal (x
3. x2. Assume that xi, xo, and x3 are the most significant bits, x2 is the second most significant bit, xl is the third most significant bit, and XO is the least significant bit.

The selection circuit 32 has an input terminal a (a3.a2.al.

ao, a3 are the most significant bits, a2 is the second hundredth most significant bit, al is the third most significant bit, aO is the least significant bit),
Input terminal b (b3.b2.bl, bO1b3 is the most significant bit, b2 is the second most significant bit, bl is the third most significant bit, bo is the least significant bit), input terminal c (c3
．． c2. cl, co.

c3 is the most significant bit, c2 is the second most significant bit, cl
is the third most significant bit, CO is the least significant bit), each of three systems has 4-bit input terminals, and any one of them is selected to output the output terminal '/0'3t y21y1. yO2y
3 is the most significant bit, y2 is the second most significant bit, yl is the third most significant bit, and yO is the least significant bit). Here, the 1/2 and 1/4 times conversion is performed by bit shifting the input motion information signal. First, input the input motion information signal as it is to input terminal a (x3 to a3,
a2 x2. xl to al, XO to aO), the input motion information signal is shifted to the right by 1 bit and input to the input terminal (b3 is fixed at low level, x3 to b2, x2 to bl,
xl) to input terminal C, and input motion information signal 2 to input terminal C.
Bits are shifted to the right and input (b3, b2 are fixed at low level, bl is x3, bo is x2) 0 For example, if the motion information level to be input is 8 (1000), the selection circuit 3
8 (1000) to input terminal a of 2, 4 (0100) to input terminal 2, 2 (0010) to input terminal c
is input. Therefore, with this configuration, the motion information signal is inputted to the input terminal a by 1 times, to the input terminal A by 172 times, and to the input terminal C by 1/4 times.

The 1 selection circuit 32 selects one of the motion information signals at the input terminals a, b, and c depending on the level of the edge detection signal α. , 2), when the edge level is O, select the signal at the input terminal a (1x), when the edge level is l, select the signal at the input terminal S (1/2x),
When the edge level is 2, the signal (1/4 times) of the input terminal C is selected and output from the output terminal y. This results in
As in the previous embodiment, the motion information at the edge portion is reduced,
Erroneous motion detection can be suppressed.

According to the first embodiment described above, as in the previous embodiment, it is possible to suppress erroneous detection of motion occurring at edge portions and to detect a highly accurate motion information signal. In addition, the adaptive conversion circuit 18 is selected by the selection circuit 3.
By configuring only 2, the scale of one circuit can be made very small.

Next, another embodiment of the edge detection circuit 19 according to the present invention will be described with reference to FIG. 9.This embodiment detects vertical edge portions and horizontal edge portions of one image to generate an edge detection signal. This is an example of the edge detection circuit 19. 9th
The figure is a block diagram of an edge detection circuit 19 explained in this embodiment.

In FIG. 9, 39 is a BPF, 40 is an absolute value circuit, and 4
1 is a bit compression circuit, 42 is a synthesis circuit, and the other parts are the same as in FIG. Give alms.

Absolute value circuit 24. Detected via the bit compression circuit 25. On the other hand, the horizontal edge portion of one image is detected by extracting a signal in a frequency band (for example, 1.8±0.5 MHz) corresponding to the horizontal edge portion from the input color television signal. First, a color television signal input from the input terminal 2 is input to the BPF 39, and the BPF 39 performs filter processing to create a horizontal edge signal. Thereafter, as with vertical edge detection, the absolute value circuit 4o removes the positive and negative polarities, and the bit compression circuit 41 performs bit compression. The bit-compressed vertical edge signal and horizontal edge signal are combined by the combining circuit 42 and outputted from the output terminal 26 as a flood of edge detection signals.
! The edge detection signal a detected at step 19 includes both vertical and horizontal edge components of the image. Therefore, in the adaptive conversion circuit 18 controlled by the edge detection signal a, it is possible to suppress false detection of both vertical edge and horizontal edge movements.

As described above, according to this embodiment, the edge detection circuit detects horizontal edges in addition to vertical edges, and combines them to create the edge detection signal a, so that all edge portions of the image can be detected. . As a result, the adaptive conversion circuit 18
In this case, it is possible to suppress false detection of movement in all edge portions of an image.

Next, other embodiments of the motion detection port Nl according to the present invention will be explained using FIG. This is an example of a motion detection circuit l. FIG. 10 is a block diagram of the motion detection circuit 1 described in this embodiment. In FIG. 10, 43 is one frame memory, 44.
46 is IH memory, 45.47 is subtraction circuit, 48.49
1 is an absolute value circuit, 50 is an output terminal, and the other parts are the same as in FIG. L at the signal
After PF processing, #i! Pairwise equivalent circuit 6 Linear conversion circuit 7
On the other hand, the color component motion signal is generated as follows. First, the color television signal input from the input terminal 2 is supplied to the BPF 8, and the color signal band signal is extracted.

The ACC PI width circuit 9 corrects the level fluctuation of the burst signal. In the output signal of the ACC amplifier circuit 9, the high frequency components of the luminance signal have the same phase and the color signal components have the opposite phase between lines. Therefore, by subtracting the signal delayed by IH in the LH memory 44 and the input signal of the IH memory 44 in the subtraction circuit 45, only the color signal component can be extracted. Also, AC
Amplification time B# for C! 9 output signal to one frame memory 43
is delayed by l frame period. From this signal delayed by one frame period, only the color signal component is extracted using the 1H memory 46 and the subtraction circuit 47 in the same manner as the processing of the input signal of the one frame memory 43. Here, since the two color signals outputted from the subtraction circuits 45 and 47 separated by one frame period have inverted phases, motion cannot be detected from a simple difference between the two signals. Therefore, absolute value circuit 48.49
After taking the absolute values of both signals, a subtraction circuit 12 obtains the movement of the color signal component. Then, in the same manner as in the embodiment shown in FIG. 1, the absolute value circuit 13 removes the positive and negative polarities, and the nonlinear conversion circuit 14 performs focus compression. After that, the motion detection signal of the bit-compressed luminance component and the motion of the color component are processed. The detection signal is synthesized by the synthesis circuit 15, subjected to noise removal processing by the noise removal circuit 16, and then outputted as a motion signal from the output terminal 50. According to this embodiment, the detection signal is equal to or greater than the embodiment shown in FIG. The motion of the image can be detected, and by using one frame memory and two IH memories for detecting the motion of the color signal component, the circuit scale can be made smaller than the embodiment shown in FIG.

Next, another embodiment of the present invention will be described with reference to FIG. 11. This embodiment is an example of a motion information signal detection circuit that converts a spatio-temporally processed motion information signal using two adaptive conversion circuits. be. FIG. 11 is a block diagram of a motion information signal detection circuit explained in this embodiment. In Figure 11, 1
is a motion detection circuit, 2 is an input terminal, F is a spatio-temporal processing circuit, 19 is an edge detection circuit, 51.52 is an adaptive conversion circuit,
52 and 53 are output terminals. First, a color television signal is input to the input terminal 2, and the motion detection circuit 1 and the spatio-temporal processing circuit 17 obtain a motion information signal.

Thereafter, this motion information signal is transferred to two adaptive conversion circuits 51.
The edge detection signals generated by the edge detection circuits are supplied to the adaptive conversion circuits 51 and 52 to respectively control and perform conversion processing, and the adaptive conversion circuits 51. 52 output signals are output from output terminals 53 and 54, respectively. Here, for example, the motion information signal from the output terminal 53 is used as a control signal for a motion adaptive luminance/color signal separation circuit (hereinafter referred to as adaptive YC separation circuit), and the motion information signal from the output terminal 54 is It is assumed that this signal is used as a control signal for an adaptive scanning line interpolation circuit (hereinafter referred to as an adaptive interpolation circuit). In this case, the conversion characteristic of the adaptive conversion circuit 51 is set to the optimum characteristic as a control signal for the adaptive YC separation circuit, and the conversion characteristic of the adaptive conversion circuit 52 is set to the optimum characteristic for the control signal of the adaptive interpolation circuit. This makes it possible to more accurately suppress erroneous detection of motion at the edge portions of the image.

Furthermore, a configuration as shown in FIG. 12 in which adaptive conversion processing using an edge is applied to only one of the motion information signal that controls the adaptive YC separation circuit and the motion information signal that controls the adaptive interpolation circuit can be considered.

In this configuration, one motion-adaptive signal processing circuit performs control that focuses on preventing malfunctions due to motion detection failure, and the other motion-adaptive signal processing circuit performs control that emphasizes prevention of malfunctions due to motion detection errors at edges. It is possible to detect motion information signals that realize control with emphasis on preventing malfunctions.

As described above, according to this embodiment, by using two adaptive conversion circuits, it is possible to perform edge conversion processing of the two motion information signals that control the adaptive YC separation circuit and the adaptive interpolation circuit, respectively, with optimal conversion characteristics. can. This makes it possible to more accurately suppress image quality deterioration due to erroneous motion detection at edge portions.

〔Effect of the invention〕

According to the present invention, in the motion information signal detection circuit, the edge detection circuit and the adaptive conversion circuit can reduce unnecessary motion that is stretched through spatiotemporal processing and extends to the edge portions of the image. Information signals can be detected. This has the effect of suppressing image flickering and dot interference due to incorrect video processing at edge portions in the motion adaptive signal processing circuit.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a block diagram showing a specific configuration of the edge detection circuit, FIG. 3 is a block diagram showing a specific configuration of the adaptive conversion circuit, and FIG. 4 is a block diagram showing another specific configuration of the adaptive conversion circuit. FIG. 5 is a characteristic diagram showing the conversion characteristics of the adaptive conversion circuit.
Fig. 6 is a characteristic diagram showing other conversion characteristics of the adaptive conversion circuit, Fig. 7 is a block diagram showing another specific configuration of the adaptive conversion circuit, and Fig. 8 shows another specific configuration of the adaptive conversion circuit. 9 is a block diagram showing another specific configuration of the edge detection circuit, FIG. 10 is a block diagram showing another configuration of the motion detection circuit, and FIGS. 11 and 12 are other blocks of the present invention. A block diagram showing an embodiment, and FIG. 13 is a block diagram showing a conventional example. Explanation of symbols 1...Motion detection circuit, 2, 27...Input terminal, 3°43...1 frame memory, 4,12,22,45°47...Subtraction circuit, 5,23...・LPF, 6,13
゜24.40,48,49...Absolute value circuit, 7,14
...Nonlinear conversion circuit, 8,39...BPF, 9...
・ACC amplifier circuit, 10... demodulation circuit, 11...
2 frame memory, 15.42... synthesis circuit, 16.
... Noise removal circuit, 17 ... Spatio-temporal processing circuit, 18
,51゜52.55...Adaptive conversion circuit, 19...Edge detection circuit, 20,26,50,53.54...Output terminal, 21.44,46...IH memory, 25.4
1...Bit compression circuit, 28, 29, 30, 31...
・Conversion circuit, 32...Selection circuit, 33, 34, 35,
36...constant multiplier, 37...multiplier, 38...
Coefficient generation circuit. Figure 後ヰ困? 1'8 Gathering! Input movement beak 1! Tamezu Collection Circulation Bacteria Ren 11 Seki Ren 2

Claims (1)

[Claims] 1) A motion detection circuit that inputs a digitized television signal and detects the movement of an image; and a time when an output signal of the motion detection circuit is input and performs processing in the temporal and spatial directions. a spatial processing circuit; an edge detection circuit that inputs the digitized television signal and detects the edge portion of the image; and an edge detection circuit that inputs the output signal of the spatio-temporal processing circuit and the output signal of the edge detection circuit and detects the edge A motion information signal detection circuit comprising: an adaptive conversion circuit that converts the output signal of the spatio-temporal processing circuit according to the output signal level of the detection circuit. 2) The adaptive conversion circuit includes a plurality of conversion circuits having different conversion characteristics for converting the output signal of the spatio-temporal processing circuit, and converts the output signal of the plurality of conversion circuits according to the output signal level of the edge detection circuit. 2. The motion information signal detection circuit according to claim 1, further comprising a selection circuit for selecting one of the motion information signal detection circuits. 3) The adaptive conversion circuit includes a plurality of constant multiplication circuits having different constants that multiply the output signal of the spatio-temporal processing circuit by a constant;
The motion information signal detection circuit according to claim 1, further comprising a selection circuit that selects one of the output signals of the plurality of constant multiplication circuits according to the output signal level of the edge detection circuit. . 4) The adaptive conversion circuit includes a coefficient generation circuit that inputs the output signal of the edge detection circuit and outputs a coefficient, and a multiplier that multiplies the output signal of the spatio-temporal processing circuit by the output signal of the coefficient generation circuit. The motion information signal detection circuit according to claim 1, further comprising a circuit. 5) The adaptive conversion circuit includes a plurality of constant subtraction circuits having different constants for subtracting a constant from the output signal of the spatio-temporal processing circuit, and a plurality of constant subtraction circuits that subtract a constant from the output signal of the spatio-temporal processing circuit, and a plurality of constant subtraction circuits having different constants. 2. The motion information signal detection circuit according to claim 1, further comprising a selection circuit for selecting one of the output signals. 6) The adaptive conversion circuit includes a coefficient generation circuit that inputs the output signal of the edge detection circuit and outputs a coefficient, and a subtraction circuit that subtracts the output signal of the spatio-temporal processing circuit and the output signal of the coefficient generation circuit. The motion information signal detection circuit according to claim 1, further comprising a circuit. 7) The motion information signal detection according to claim 1, wherein the adaptive conversion circuit comprises a bit shift circuit that bit-shifts the output signal of the spatio-temporal processing circuit according to the output signal level of the edge detection circuit. circuit. 8) Claim 1, wherein the edge detection circuit comprises a vertical edge detection circuit that receives the digitized television signal and detects a vertical edge portion of an image.
8. The motion information signal detection circuit according to 7. 9) The edge detection circuit includes a vertical edge detection circuit that receives the digitized television signal and detects the vertical edge portion of the image, and a vertical edge detection circuit that receives the digitized television signal and detects the horizontal edge portion of the image. 8. Motion information signal detection according to claim 1, further comprising a horizontal edge detection circuit for detecting, and a synthesis circuit for synthesizing the output signal of the vertical edge detection circuit and the output signal of the horizontal edge detection circuit. circuit. 10) The adaptive conversion circuit has an output terminal that converts and outputs the output signal of the spatio-temporal processing circuit according to the output signal level of the edge detection circuit, and an output terminal that converts and outputs the output signal of the spatio-temporal processing circuit according to the output signal level of the edge detection circuit. 10. The motion information signal detection circuit according to claim 1, further comprising an output terminal for outputting the motion information signal as it is. 11) The adaptive conversion circuit includes a first adaptive conversion means that converts the output signal of the spatio-temporal processing circuit according to the output signal level of the edge detection circuit; 10. The motion information signal detection circuit according to claim 1, further comprising second adaptive conversion means for converting the output signal of the spatio-temporal processing circuit.