JP2644258B2 - Motion signal processing circuit - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to motion detection which is performed based on an inter-frame difference signal of a digitized television signal and indicates a motion of an image obtained by the television signal. The present invention relates to a motion signal processing circuit that performs signal processing on a signal to obtain a motion control signal for controlling a motion adaptive signal processing circuit.

[Conventional technology]

2. Description of the Related Art Conventionally, there is a technique in which interlaced scanning performed by the NTSC system is converted into sequential scanning by interpolating scanning lines on a receiver side and displayed. As described above, if an interpolated scanning line signal is created using the scanning line signal one field before using the field memory and is converted to sequential scanning, for example, line flicker generated at an edge portion when a horizontal stripe pattern is displayed is obtained. Can be removed. However, this inter-field interpolation can obtain a great effect on a still image, but in the case of a moving image, it causes a great deterioration such as generation of a comb-like double image.

Therefore, in an example disclosed in Japanese Patent Application Laid-Open No. 58-205377, the motion of an image is detected based on a difference signal between one frame,
If the motion of the image is small, inter-field interpolation is performed, and if the motion of the image is large, an interpolated scanning line signal is created using the transmitted scanning line signal in the field, and interpolation within the field is performed. Processing is in progress. However, when the motion of the image is detected based on the difference signal between one frame as described above, there is a problem that if the motion of the image is fast, the motion cannot be detected accurately. .

That is, as shown in FIG. 6, for example, when the image J of the object moves from the top to the bottom of the screen P, interlaced scanning is performed with the vertical axis being the vertical direction of the screen and the horizontal axis being the time axis. FIG. 7 shows the motion of the image J of the object using the scanning lines.

In FIG. 7, a circle indicates a cross section of the scanning line l. Mth
When creating the interpolated scan line indicated by the triangle in the field,
Since it is a moving image, the main body needs to perform intra-field interpolation. However, as is clear from FIG. 7, the scanning line l _M-1 and the (M + 1) -th field in the (M-1) -th field are used as inter-frame difference signals. ) When the difference from the scanning line l _{M + 1} in the field is taken, the difference is zero because the information of both scanning lines is the same, so that the movement of the position of the triangle cannot be detected from the inter-frame difference signal. Therefore, inter-field interpolation, which is still image processing, is performed on a moving image, and deterioration such as the above-described double image occurs.

In addition, for a fine pattern, erroneous detection of a movement may occur similarly even if the movement is relatively slow.

In order to solve such a problem, in the above-described general proposal example, the low-pass filter processing is performed on the motion of the image detected based on the inter-frame difference signal, that is, the motion amount. I have.

For example, when the image J of the object moves from left to right on the screen, the vertical axis represents the time axis, and the horizontal axis represents the horizontal direction of the screen. ). Then, as the inter-frame difference signal, the (M−
The motion amount detected by taking the difference between the 1) field and the (M + 1) th field is as shown in FIG. 8 (b). However, in this case, there is a range where the amount of motion is zero despite the fact that there is always a motion, so that erroneous detection is performed. Therefore, a process for correction, that is, a low-pass filter process is performed on the motion amount, and the corrected motion amount shown in FIG. 8C is obtained.

However, in this method, as described below, a similar pattern motion amount is generated depending on a picture, and moving image processing is performed on a still image, so that there is a possibility that the resolution is reduced or flicker is generated. there were.

That is, for example, as shown in FIG.
Figure 8 as are stationary, shown when only the image W _1, W ₂ of the two frames is moved slowly from the left of the screen to the right, the amount of the detected movement Fig. 9 (b) (b) And thus,
The corrected motion amount is also shown in FIG. 8 (c) as shown in FIG. 9 (c).
Therefore, the moving image processing (that is, intra-field interpolation) is performed assuming that the image S of the object between the two frames is still moving even though it is a still image. .

Further, in the above-mentioned general proposal example, up to how fast the erroneous detection can be prevented is set in advance by a circuit constant. Therefore, there is no effect on the movement at a speed higher than this.

[Problems to be solved by the invention]

As described above, in the related art, in order to accurately detect a fast motion of an image, a motion amount detected based on an inter-frame difference signal, that is, a low-pass filter process is performed on the motion detection signal. However, depending on the design of the image, a still image may be erroneously detected as a moving image. In addition, there is a problem in that accurate detection can be performed for a certain high-speed movement, but erroneous detection is performed for a higher-speed movement.

Furthermore, in the above-described related art, there is a case where a motion is erroneously detected even though there is no motion due to the influence of noise or the like.

The present invention has been made in view of the above-described problems of the related art, and therefore, an object of the present invention is to accurately detect the movement of an image regardless of the pattern of the image and the like. It is another object of the present invention to provide a motion signal processing circuit which can accurately detect a motion signal and which is less likely to be erroneously detected due to the influence of noise or the like.

[Means for solving the problem]

In order to achieve the above object, according to the present invention, a motion detection signal detected based on an inter-frame difference signal of a digitized television signal and a certain first signal are input, and both are used. A spatio-temporal filter means for performing a filtering process in a time direction and / or a spatial direction, and the motion detection signal and the output signal of the spatio-temporal filter means are input, and both of them are switched, and one is used as the first signal. Switching means for inputting to the spatiotemporal filter means, and control means for controlling which signal is output by the switching means depending on whether the value of the output signal of the spatiotemporal filter means is larger or smaller than a certain value. And, it was made to consist of.

[Action]

The spatio-temporal filter receives the motion detection signal and an output signal of the switching unit (ie, the first signal),
Filter processing is performed in the time direction and / or the spatial direction (vertical and horizontal directions on the screen) using both of them.

The switching unit inputs the motion detection signal and the output signal of the spatiotemporal filter unit, and outputs one of them under the switching control by the control unit.

The control means, when the value of the output signal of the spatio-temporal filter means is larger than a predetermined value,
The switching means controls so as to output the output signal of the spatiotemporal filter means. If the output signal is small, the switching means controls so as to output the motion detection signal.

Therefore, when the value of the output signal of the spatiotemporal filter means is larger than the certain value, a feedback-type configuration is used. Pixels (pixels around the space,
That is, it is possible to refer to the information on the movement of the image (up, down, left, right, and past pixels), and therefore, it is possible to accurately detect the movement even when the image is fast moving.

Further, when the value of the output signal of the spatiotemporal filter means is smaller than the certain value, the structure becomes a feedforward type, and the information of the motion once detected is maintained over several fields, Pixels do not spread. Therefore, even if there is no movement due to the influence of noise or the like, it is erroneously detected that there is movement,
The information is immediately attenuated and spreads to surrounding pixels,
In particular, erroneous detection due to the influence of noise or the like can be minimized without continuing.

In addition, regarding the effect of detecting a motion accurately for a fast motion of an image by the above-mentioned spatiotemporal filter,
The present inventors have filed an application in Japanese Patent Application No. 60-250912.

〔Example〕

Hereinafter, a first embodiment of the present invention will be described with reference to FIG.

In FIG. 1, 1 is an input terminal, 2 is a spatiotemporal filter circuit, 3 is a switching circuit, 4 is a control circuit, 5 is a coefficient circuit, 6
Is an output terminal, 7 is a field memory, 8 is a line memory, 9 is a maximum value selection circuit, and 10 is a horizontal filter circuit. In the following description, for simplicity, it is assumed that an NTSC television signal (525 scanning lines, 2: 1 interlace scanning) is handled. In this case, the field memory 7
262H capacity (1H is one horizontal scanning period), line memory 8 is 1H
What is necessary is just to have capacity.

From the input terminal 1, a motion detection signal (this signal is a digital signal) which is detected based on an inter-frame difference signal of the digitized television signal and indicates the motion of an image obtained by the television signal. It is supplied to the spatio-temporal filter circuit 2 and the switching circuit 3. The switching circuit 3 receives the motion detection signal and the spatiotemporal filter circuit 2
Is switched by the coefficient circuit 5 to a signal multiplied by α (0 <α <1) and supplied to the spatio-temporal filter circuit 2.

In the spatio-temporal filter circuit 2, the output signal from the switching circuit 3 is delayed by the field memory 7 and the line memory 8, and a signal delayed by 262H and a signal delayed by 263H are obtained. Then, the maximum value selection circuit 9 sets
Among the two delayed signals and the motion detection signal from the input terminal 1, the largest signal value (that is, the level value of the digital signal) is obtained and output. After that, the horizontal filter circuit 10 performs a filtering process in the horizontal direction of the screen, and outputs from the output terminal 6.

The signal output from the output terminal 6 is used as a motion control signal for controlling a motion adaptive signal processing circuit (not shown).

When the value of the output signal of the spatio-temporal filter circuit 2 is smaller than a preset value, the control circuit 4 selects the lower side of the switch of the switching circuit 3 and outputs the motion detection signal from the input terminal 1. The switching circuit 3 is controlled so as to output the signal. When the switching circuit 3 is large, the switch selects the upper side and controls the output signal from the coefficient circuit 5 to be output.

 The above operation will be described more specifically with reference to FIG.

In FIG. 2, as in FIG. 7, when the image J of the object moves from the top to the bottom of the screen, interlaced scanning is performed with the vertical axis being the vertical direction of the screen and the horizontal axis being the time axis. FIG. 9 is an explanatory diagram illustrating a motion of an image J of an object using scanning lines.

 In FIG. 2, circles indicate cross sections of the scanning line l.

Now, in FIG. 1, it is assumed that the switch of the switching circuit 3 is selected upward by the control circuit 4, and a triangular mark (interpolated scanning line) n ₁ in the M-th field of FIG. It is assumed that the motion detection signal at the position is input. That is, the motion detection signal of the position of the triangle n ₁ is as interframe difference signal by taking the difference between the scanning line l ₄ and the scanning line l ₁ in the (M-1) field in (M + 1) th field It is obtained.

Well, here, in this manner, consider how when the motion detection signal of the position of the triangle mark n ₁ is inputted from the input terminal 1, any signal from the field memory 7 and the line memory 8 is obtained Try.

First, what is first thought, because he has 262H and 263H delay by a field memory 7 and the line memory 8, than the motion detection signal of the position of the input triangle n _1, input before 262H before or 263H This is the motion detection signal obtained. That is, the 262H previous motion detection signal, in FIG. 2, the motion detection signal (scanning line l ₃ positions of triangle n ₃ scan lines
an obtained by taking the difference) between l _6, and the 263H previous motion detection signal, taking the difference of the motion detection signal of the position of the triangle n ₂ (and the scanning line l ₂ and the scanning line l ₅ obtained Is). But,
These two motion detection signals are not output as they are from the field memory 7 or the line memory 8 but pass through the coefficient circuit 5, so that each motion detection signal is output in a form multiplied by α.

The Next possible, rather than the motion detection signal of the position of the input triangle n _1, (262H + 262H) before or (262H + 26
3H) or a motion detection signal input before (263H + 263H). That is, the (262H + 262H) before motion detection signal in Fig. 2, a motion detection signal of the position of the triangle n _6, and (262H + 263H) before the motion detection signal, triangle n ₅
A motion detection signal of the position of the (263H + 263H) before motion detection signal, a motion detection signal of the position of the triangle n _4.
In addition, since the signal passes through the coefficient circuit 5 twice, each of the motion detection signals is output from the field memory 7 or the line memory 8 in a form multiplied by α × α.

Further conceivable is the (M-3) shown in FIG.
The motion detection signal at the position of each triangle in the field is
α is ^three times the signal.

Thus, from the field memory 7 and the line memory 8, than the motion detection signal of the position of the input triangle n _1, about one field before, about two fields before, ... and said signal is alpha, alpha ² ,... May be output.

Then, from the maximum value selection circuit 9, the output signals from the triangle n field memories 7 and the line memory 8 and the motion detection signal and the position ₁ from the input terminal 1, the largest signal value Is output. That is, in FIG. 2, the motion detection signal of the position of the triangle n ₁ is Taking the difference is zero (the scan lines l ₁ and the scanning line l _4, the difference because the information is the same for both scan line zero and because made) is, triangles n _2, triangle n
When the motion detection signal of the position of the ₃ takes the difference with a value comprised respectively (scanning line l ₂ and the difference or the scanning line l ₃ and the scanning line l ₅ and the scanning line l _6, respectively, information of both the scan line Since the difference is different, the difference takes a certain value), so that the signal multiplied by α has a certain value. Further, triangle n _4, triangle n _5, since the motion detection signal of the position of the triangle n ₆ represents is zero, respectively, the alpha ² times the signal is also zero. Therefore, from the maximum value selection circuit 9, and α times, the motion detection signal of the position of the triangle n ₂ or triangles n ₃ is output.

That is, in the conventional, as noted in Figure 7, has been erroneously detected as the position of the triangle of the M field (corresponding with the position of the triangle n ₁ of FIG. 2) "no motion" However, in the present embodiment, "moving" is accurately detected.

As described above, in this embodiment, when the switch of the switching circuit 3 is selected to upper, the presence or absence of motion in a certain pixel on the screen detection, the pixel (the triangle n ₁ in the above example The pixel at the position is determined with reference to the information of the movement of the pixel in the up and down (vertical direction of the screen) and the past.

Next, the output signal from the maximum value selection circuit 9 is filtered in the horizontal direction of the screen in the horizontal filter circuit 10 as described above. Accordingly, the detection of the presence or absence of a motion at a certain pixel on the screen is determined by referring to the information of the motion of the left and right (horizontal direction of the screen) pixels as well as the above and below and past pixels. Will be done.

Here, when detecting the presence / absence of a motion in a certain pixel on the screen, the range of the pixel in which the motion information can be referred to is a range determined by the coefficient α (0 <α <1) in the coefficient circuit 5. It is. That is, the range of referenceable pixels increases as α approaches 1 and decreases as α approaches 0.

In the above description, the coefficient circuit 5 is
It has been described that the input signal is multiplied by α (0 <α <1) and output. However, since both the input signal and the output signal are digital signals, even if the input signal is exactly multiplied by α, the output signal is converted to an integer. The output is approximated. Therefore, like this:
Since the output signal is output in an approximated form, a subtraction process may be performed as an approximate calculation instead of multiplying by α.
For example, when α = 0.9, instead of multiplying by 0.9, a subtraction process according to the formula of output signal = input signal−1 (when input signal ≧ 1) is performed, the result is almost the same. Will be obtained.

Now, next, in Figure 1, it has been selected on the lower side by the switch of the switching circuit 3 is controlled circuit 4, from the input terminal 1 is the motion detection signal of the position of the triangular mark n ₁ shown in FIG. 2 The case where the information has been input will be described.

In this case, from the field memory 7 and the line memory 8, a motion detection signal input before 262H before and 263H than the motion detection signal of the position of the triangle n _1, i.e., triangle n ₃
Only motion detection signal and the motion detection signal of the position of the triangle n ₂ position only not output.

Therefore, the maximum value selection circuit 9 outputs triangles n ₁ and n
₂ , of the motion detection signals at each position indicated by the triangle mark n ₃ , the one having the largest signal value is output and reaches the output terminal 6 via the horizontal filter circuit 10.

That is, in this embodiment, when the switch switching circuit 3 is selected to be lower, the presence or absence of motion in a certain pixel on the screen detection, the pixel (in the above example of the position of the triangle n ₁ Pixel) is determined by referring only to information on the motion of only the adjacent pixels in the up / down, left / right, and past.

Next, as the value of the output signal of the spatiotemporal filter circuit 2 changes with time, the switch of the switching circuit 3 is switched to the control circuit 4.
How the switching is performed will be described with reference to FIG.

FIG. 3 is a characteristic diagram showing a temporal change in the value of the output signal of the spatiotemporal filter circuit in FIG. 1 when focusing on a certain pixel on the screen.

In FIG. 3, the vertical axis indicates the value of the output signal of the spatiotemporal filter circuit 2 for a certain pixel on the screen, and the horizontal axis indicates time. The time shown on the horizontal axis is 1 / 60se
The first delimiter is the first field, the second delimiter is the second field, the third delimiter is the third field,....

In FIG. 3, when a signal whose signal value is 2, 4, 6, 8, 10, 12 is input to the input terminal 1 in the first field as a motion detection signal of a certain pixel in order from the left side, , The temporal change of the value of the output signal of the spatio-temporal filter circuit 2 is shown. It is assumed that the input motion detection signal of a certain pixel has a value of 0 before the first field and after the second field.

Also, in FIG. 3, the value set in the control circuit 4 is set to 5, and the operation in the coefficient circuit 5 is defined as the output signal =
The subtraction processing according to the expression of the input signal-2 is represented as a row.

Therefore, for example, when a signal having a signal value of 12 is input to the input terminal 1 as a motion detection signal of a pixel in the first field, and a signal of 0 is input in the second and subsequent fields, The value of the output signal of the spatiotemporal filter circuit 2 changes with time as shown on the rightmost side of FIG.

That is, in the first field, the spatio-temporal filter circuit 2 outputs a motion detection signal from the input terminal 1, that is, the value of the signal.
A signal of 12 is output. At this time, since the value of this output signal is larger than the value 5 previously set in the control circuit 4, the control circuit 4 switches the switch of the switching circuit 3 upward. And after the second field,
Since the value of the motion detection signal from the input terminal 1 is 0, the motion detection signal from the input terminal 1 is replaced by the coefficient circuit 5, the field switching circuit 3, and the field memory 7 (or the line memory 8). A signal is output. However, since the signal value of this signal is subtracted by 2 by the coefficient circuit 5, the signal value decreases by 2 every time the signal passes through the coefficient circuit 5, that is, for each field.

Then, at the time of the fifth field, the value of the output signal of the spatio-temporal filter circuit 2 is 4, which is smaller than the value 5 previously set in the control circuit 4, so that the control circuit 4 Move the switch down. Thereby, in the fifth field, the spatiotemporal filter circuit 2
, A signal having a value of 4 stored in the field memory 7 is output. At the same time, a signal having a value of 0 (motion detection signal) from the input terminal 1 is written in the field memory 7. . Therefore, at the time of the sixth field, the value of the output signal of the spatiotemporal filter circuit 2 is 0.

For example, when a motion detection signal of a certain pixel is input to the input terminal 1 in a first field of a signal having a signal value of 4 and a signal of 0 is input after a second field, The value of the output signal of the spatiotemporal filter circuit 2 with respect to the pixel temporally changes as shown from the left in FIG.

That is, in the first field, the spatiotemporal filter circuit 2 outputs a motion detection signal from the input terminal 1, that is, a signal having a signal value of 4, and the switch of the switching circuit 3 selects the lower side. Therefore, a signal (motion detection signal) having a value of 4 from the input terminal 1 is written in the field memory 7. However, in the second field, since the value of the motion detection signal from the input terminal 1 is 0, the signal having a value of 4 written in the field memory 7 is output from the spatiotemporal filter circuit 2 and the field memory 7 7, a signal (motion detection signal) having a value of 0 from the input terminal 1 is written. Therefore, at the time of the third field, the value of the output signal of the spatio-temporal filter circuit 2 is 0.

FIG. 3 is a characteristic diagram showing a temporal change in the value of the output signal of the spatio-temporal filter when focusing on a certain pixel on the screen as described above. In FIG. Is taken not in time but in the screen vertical or horizontal direction, the figure shows that for a pixel and each pixel adjacent to that pixel along the screen vertical or horizontal direction, the spatio-temporal filter for those pixels It will represent the value of the output signal. However, in this case, the values of the pixels are not at the same time.

As described above, in the present embodiment, the filter processing is performed by the spatio-temporal filter circuit 2 instead of performing the low-pass filter processing as in the related art. Is not erroneously detected as a moving image.

When the value of the output signal of the spatio-temporal filter circuit 2 is larger than the value preset in the control circuit 4, the output signal from the coefficient circuit 5 is output from the switching circuit 3, and the entire circuit is output. Is a feedback type configuration and can refer to information on a wide range of pixel movement,
Even when the image moves fast, the motion can be accurately detected.

When the value of the output signal of the spatiotemporal filter circuit 2 is smaller than the value set in the control circuit 4 in advance, the switching circuit 3 outputs a motion detection signal from the input terminal 1, and the entire circuit Has a feed-forward configuration, and limits the range of pixels that can be referred to to adjacent pixels. The information can be prevented from spreading to surrounding pixels. Therefore, erroneous detection due to the influence of noise or the like can be minimized.

As the value set in advance in the control circuit 4, an image is actually evaluated and an optimum value is selected.

In the embodiment of FIG. 1 described above, the line memory 8 is cascade-connected to the subsequent stage of the field memory 7 when obtaining a signal delayed by 262H and a signal delayed by 263H.
The present invention is not limited to this. For example, as shown in FIG. 4, a configuration may be adopted in which the field memory 7 is provided after the line memory 8.

FIG. 4 is a block diagram showing a second embodiment of the present invention.

In FIG. 4, 11 and 12 are maximum value selection circuits,
It is the same as the figure.

In the present embodiment, of the motion detection signals of two pixels separated by 1H, that is, the pixels adjacent in the vertical direction, the larger one of the signal values is obtained in advance by the maximum value selection circuit 11, and the output of the maximum value selection circuit 11 Is supplied to the field memory 7 and delayed by 262H, and the output of the field memory 7 obtains the larger signal value of the signals obtained by delaying the output signal from the switching circuit 3 by 262H and 263H.

The maximum value selection circuit 12 selects the larger of the signal value from the motion detection signal from the input terminal 1 and the output signal from the field memory 7. Therefore, the maximum value selection circuit 12
In FIG. 1, the motion detection signal from the input terminal 1 and the output signal from the switching circuit 3 obtained by delaying the output signal by 262H and 263H have the maximum signal value, which is shown in FIG. This is equivalent to the output of the maximum value selection circuit 9 in the embodiment.

The operation of the other parts in this embodiment is equivalent to that of the embodiment shown in FIG. 1, and a description thereof will be omitted.

Next, FIG. 5 is a block diagram showing a third embodiment of the present invention.

In FIG. 5, reference numeral 13 denotes a switching control circuit, and others are the same as those in FIG.

The switching control circuit 13 in this embodiment is configured by integrating the switching circuit 3, the control circuit 4 and the coefficient circuit 5 in the embodiment of FIG. The output signal of the spatial filter circuit 2 is used as an address input and a ROM (read only memory) for outputting data is provided.

That is, the switching control circuit 13 receives the output signal of the spatio-temporal filter circuit 2 and, when the value of the output signal of the spatio-temporal filter circuit 2 is large, multiplies the output signal of the spatio-temporal filter circuit 2 by α. When the value of the output signal of the spatiotemporal filter circuit 2 is small, the operation is performed so as to output a motion detection signal from the input terminal 1.

According to the present embodiment, the configuration can be simplified by integrating the switching circuit 3, the control circuit 4, and the coefficient circuit 5 in FIG. 1 into the switching control circuit 13. Also, by using a ROM as the switching control circuit 13, it is possible to output an arbitrary value, and by setting an appropriate value based on the result obtained by the actual image quality evaluation, the motion detection performance can be set. Can be further improved.

〔The invention's effect〕

In the present invention, since the motion detection signal detected based on the inter-frame difference signal of the television signal is not subjected to the low-pass filter processing as in the related art, but the spatio-temporal filter processing is performed. As described above, a still image is not erroneously detected as a moving image depending on the design of the image.

Further, according to the present invention, when detecting the presence or absence of motion at a certain pixel on the screen, if the output signal of the spatio-temporal filter means is large, the spatio-temporal filter processing is a feedback type processing, It is possible to refer to information on the motion of a wide range of pixels (pixels around it in time and space, that is, up and down, left and right, past pixels), and therefore accurately detect motion even in fast motion of images. can do. When the output signal of the spatiotemporal filter means is small,
The spatio-temporal filter processing is a feedforward type processing. Even if there is no movement due to the influence of noise or the like, the information is immediately attenuated, and the information is immediately attenuated. Erroneous detection due to the influence of noise or the like can be minimized without spreading or persisting to the pixels having the same value.

Therefore, there is an effect that the performance of detecting the motion of an image is improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention, and FIG.
FIG. 3 is an explanatory diagram for explaining the operation of the spatiotemporal filter circuit of FIG. 1, and FIG. 3 is a diagram of the output signal value of the spatiotemporal filter circuit in FIG. 1 when focusing on a certain pixel on the screen. FIG. 4 is a block diagram showing a second embodiment of the present invention, FIG. 5 is a block diagram showing a third embodiment of the present invention, and FIG. FIG. 7 is an explanatory diagram showing an image of an object moving downward from FIG. 7, FIG. 7 is an explanatory diagram showing the motion of the image of the object in FIG. 6 using scanning lines, and FIG. FIG. 8B is an explanatory diagram showing the image of the object moving from left to right, FIG. 8B is an explanatory diagram showing the amount of motion obtained by the motion of the image of the object in FIG. FIG. 9 (c) is an explanatory diagram showing the corrected motion amount obtained by correcting the motion amount of FIG. 8 (b), and FIG. 9 (a) is from left to right on the screen. Description showed in image of the object which is stationary with the frame that moves me view, FIG. 9 (b) is 9
FIG. 9A is an explanatory diagram showing a motion amount obtained by the motion of the image of the frame, and FIG. 9C shows a corrected motion amount obtained by correcting the motion amount shown in FIG. 9B. FIG. DESCRIPTION OF SYMBOLS 1 ... input terminal, 2 ... spatio-temporal filter circuit, 3 ... switching circuit, 4 ... control circuit, 5 ... coefficient circuit, 6 ... output terminal, 7 ... field memory, 8 ... Line memory,
9, 11, 12: Maximum value selection circuit, 10: Horizontal filter circuit, 13: Switching control circuit.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Shigeru Hirahata 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Home Appliances Research Laboratory, Hitachi, Ltd. (72) Kazuo Nakagawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Address: Hitachi, Ltd.

Claims (2)

(57) [Claims] 1. A motion-adaptive signal obtained by performing signal processing on a motion detection signal indicating a motion of an image obtained by a television signal, which is detected based on a difference signal between frames of a digitized television signal. In a motion signal processing circuit for obtaining a motion control signal for controlling a processing circuit, the motion detection signal and a first signal described below are input, and after delaying the first signal in the time direction, A spatio-temporal filter means for selecting a signal having a maximum level value from the first signal and the motion detection signal, delaying the selected signal having the maximum level value in the spatial direction, and outputting the signal as the motion control signal And, when the motion control signal is smaller than a preset set value, of both the motion control signal and the motion detection signal obtained by multiplying the motion control signal by a desired coefficient. Motion signal processing circuit's and when larger, characterized in that it comprises a selection means for outputting as said first signal by selecting the former. 2. The spatio-temporal motion signal processing circuit according to claim 1, wherein when the selection means selects the motion control signal obtained by multiplying a desired coefficient as the first signal, The filter means, as its signal processing,
The feedback type spatio-temporal filter processing, that is, signal processing for maintaining the motion control signal over a plurality of field periods while repeating the attenuation based on a constant attenuation constant every one field period is performed, and the selecting unit performs the first processing. When the motion detection signal is selected as the signal, the spatiotemporal filter means performs
A motion signal processing circuit which performs feedforward spatio-temporal filter processing, that is, signal processing for maintaining a motion control signal only for one field period.