JP2992385B2 - Motion detection circuit and video recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video recorder for recording a video signal.
The present invention relates to a recording / reproducing apparatus such as a TR (Video Tape Recorder), an optical disk, and a magneto-optical disk, and more particularly, to a technique for detecting a motion amount of a video during reproduction.

[0002]

2. Description of the Related Art When reproducing a video signal recorded on a VTR or the like, a screen is thinned out in order to adjust a reproduction time or to produce a special effect such as slow motion, a still image, and a double speed reproduction. In some cases, special reproduction of the same screen is repeated.

On the other hand, in the case of an interface video signal,
One picture (frame) is composed of two fields that are interrelated with each other.

Accordingly, in the case of thinning out the screen or performing special reproduction in which the same screen is repeated for the recorded interface video signal, a field video signal is created from the reproduced video signal, and the field video signal is generated. It is necessary to maintain order. This is because if the order of the fields is not maintained, the center of gravity of the image shifts and the vertical resolution deteriorates.

Therefore, conventionally, video signals of different fields have been created from reproduced video signals by using an interpolation filter technique.

On the other hand, when a video signal of a different field is created from a reproduced video signal using an interpolation filter technique, that is, when performing field conversion, only data in the same field is used. The field transformation used (hereinafter referred to as
In addition to performing “field conversion within a field”, when the reproduced video is a still image, the data of a plurality of fields whose scanning lines are in an interlaced relationship are obtained. It is known that image quality during special reproduction can be improved by performing field conversion (hereinafter, referred to as "field conversion between fields"). When the reproduced video is a still image, the luminance signal and the chrominance signal in the video signal are separated.
Rather than two-dimensional Y / C separation using data in the same field, three-dimensional Y / C separation using data from a plurality of fields using inter-frame correlation. It is desirable to carry out by C separation.

However, such a field in the field
To perform field conversion, field-to-field field conversion, two-dimensional Y / C separation, or three-dimensional Y / C separation, field conversion must be performed. It is necessary to judge whether or not the reproduced video is a still image by detecting the motion of the video from the data of the field to be reproduced and the data of several fields immediately before the field. Become.

[0008] As a motion detecting circuit for detecting the motion of an image, a circuit described in Japanese Patent Publication No. Hei 13-13790 is known.

FIG. 5 shows the configuration of the motion detection circuit.

In FIG. 5, reference numeral 401 denotes an input terminal of a video signal, and 402 and 403 are connected to a motion adaptive Y / C separation circuit and a motion adaptive field conversion circuit, respectively, and output a motion amount detected by this circuit. Output terminals 411, 4
Reference numeral 12 denotes a delay circuit for delaying an input video signal by one frame, 413 and 414 denote 262 horizontal scanning periods (hereinafter, the horizontal scanning period is indicated by "H"), 1H delay circuits, and 421 and 422 denote delay circuits. Subtractors 431 and 432 are nonlinear absolute value circuits, 433 is a synthesis circuit, 434 is a low-pass filter (hereinafter, referred to as “LPF”) that passes only signals in a frequency region lower than an arbitrary frequency, and 435 is an edge. A detection circuit 436 is an isolated point removal circuit, 437 is a motion synthesis circuit, and 438 is a motion expansion filter.

In this device, a video signal input from an input terminal 401 is appropriately delayed by delay circuits 411 and 412,
A subtractor 421 is used to subtract the input video signal and the output of the delay circuit 412.
The subtractor 422 subtracts the input video signal and the output of the delay circuit 411 from the motion signal of the difference between the two frames.
A color signal component is removed by the LPF 434, and a motion signal of one frame difference is calculated.

The motion signals of the two-frame difference and the one-frame difference are subjected to nonlinear processing and absolute value processing by nonlinear absolute value circuits 431 and 432, respectively, in accordance with the edge information detected by the edge detecting circuit 435. Is applied to the synthesis circuit 43
3 while being weighted. The motion signal output from the combining circuit 433 is subjected to an isolated point removing circuit 436 to remove the influence of noise or the like.

The motion signal α output from the isolated point removing circuit 436 is input to the motion synthesizing circuit 437 together with the motion signal β delayed by 262H in the delay circuit 413 and the motion signal γ further delayed by 1H in the delay circuit 414. , Coefficient k1,
After being synthesized while being weighted by k2 and k3, it is output from an output terminal 402 and controls the motion adaptive Y / C separation circuit. The motion adaptive Y / C separation circuit is a circuit that selectively executes two-dimensional Y / C separation and three-dimensional Y / C separation according to the amount of motion.

In the motion expansion filter 438, the motion synthesis signal output from the motion synthesis circuit 437 is spatially dulled and output from the output terminal 403, and the motion adaptive filter is output.
Controls the field conversion circuit. The motion-adaptive field conversion circuit is a circuit that selectively executes a field conversion within a field and a field conversion between fields according to the amount of motion.

As described above, according to the circuit disclosed in Japanese Patent Publication No. Hei 13-13790, it is possible to detect the motion of a video signal with high accuracy, and to use a motion adaptive Y / C separation circuit and a motion adaptive type filter. This makes it possible to prevent erroneous control of the negative conversion circuit and improve the image quality during special reproduction.

FIG. 6 shows a motion adaptive type field.
An example of field conversion within a field and field conversion between fields of a field conversion circuit will be described below.

In FIG. 6, reference numeral 501 denotes data of an arbitrary line in an arbitrary input field, 502 denotes data one line before the data 501, and 503 denotes a field to which the data 501 and 502 belong. This is the data of the field immediately before the field which is to be interfaced with the data 501 and 502.

If the reproduced video is a moving image and the input field and the output field are odd or even, the data is output.
The data 501 and 502 are added three-to-one and output. If the input field and output field are odd or even, the data 501 and 502 are added one-to-three and output. This is the intra-field conversion.

On the other hand, when the reproduced image is a still image and the input field number and the output field number are even and odd, the data 501 and the data 503 are added one-to-one and output. If the input field number and the output field number do not match, the data 502 and 503
Are added one-to-one and output. This is the field-to-field conversion.

As described above, in order to perform field conversion between fields on a still image, data of a field to be subjected to field conversion, and the field and a scanning line are interfaced. The data of the immediately preceding field to be traced is required.

When the reproduced video is repeated in slow motion reproduction or the like, the data of the immediately preceding field necessary for the field conversion between the fields is subjected to the field conversion. In some cases, the data may be exactly the same as the data of the field to be performed. In this case, correct field-to-field field conversion cannot be performed. For this reason, in such a case, immediately before the repetition of the image starts, the data of the field to be subjected to the field conversion and the data of the field where the scanning lines are interfaced. Is stored in the memory means, and the data between the fields is used by using the data.
Field conversion.

[0022]

In FIG. 7, <A> shows a state in which a recorded moving image is normally reproduced.

In the figure, 601, 602, 603, 604,
Numeral 605 denotes temporally continuous one-field video signals reproduced sequentially from the tape.

<B> shows the same image at 1 / 6x speed.
This is an example of the case where each video signal is reproduced six times. The video signals 611 to 616 are video signals having the same pattern and the same field number as the video signal 601, and the video signals 621 to 625 are video signals having the same pattern and the same field as the video signal 602.

Now, referring to FIG. 7B, for example, the data 62
In the case of performing the field conversion on the data No. 4 in the conventional motion detection circuit described above, the motion between the two frames and the one frame is detected from the data 616 and the data 622, and as a result, the result 2 is obtained.
It is determined that the reproduced video signal is a moving image based on the motion detection result of the difference between frames. Accordingly, the motion-adaptive field conversion circuit uses only the data 624 to store the field in the field.
Performs field conversion.

However, when the data 625 is field-converted, the conventional motion detection circuit uses the same field of data 621 and data 623 to calculate the difference between two frames,
Data 625 is used to detect the motion of the difference between one frame.
Is determined to be a still image. For this reason, in the motion adaptive field conversion circuit, the data 625, the data 625 and the scanning lines are in an interlaced relationship, and the repetition of the reproduced video stored in the memory means is performed. Field-to-field conversion is performed using the data 616 which is the data immediately before the start of. As a result, the reproduced video signal as a moving image is
Since the field conversion is performed between the fields, an afterimage is generated in the data after the field conversion, and the reproduced image is significantly deteriorated.

That is, the same field such as slow motion is used.
According to the circuit disclosed in Japanese Patent Publication No. Hei. 3-13790, when the reproduced video signal is repeatedly reproduced for a certain period of time, the motion of the reproduced video signal cannot be detected correctly. There is a problem that control of the field conversion circuit is incorrect.

An object of the present invention is to provide a motion detecting circuit capable of correctly detecting the motion of a reproduced video signal even when the same field is repeatedly reproduced for a certain period. And

[0029]

[0030]

According to the present invention, there is provided a motion detecting circuit for inputting a video signal constituting one frame from two fields and detecting a motion of the input video signal. A video signal delay means for delaying an input video signal, a motion memory for storing the motion of the video signal for one field, and a field to which the input video signal belongs immediately before the field. Field jump detecting means for detecting whether or not the input field is repeated, and video signal delay means when a video signal of a field which is not a repetition of the field input immediately before is input. The video signal of the input field is delayed from the video signal of the field before the frame by n (where n is an arbitrary natural number) from the input field delayed. Detecting a movement between a motion detecting means for updating the contents of the motion memory, the Fi - depending on the detected result of the field jump detection means, Fi previously input - not a repeat of field Fi - For field is The motion detected by the motion detecting means is output as the motion of the video signal of the field, and for the field which is a repetition of the field input immediately before, the motion stored in the motion memory is calculated. - motion detection, characterized in that it comprises a selection means for outputting a movement of the field of the video signal
Provide an output circuit .

[0031]

[0032]

According to the motion detection circuit according to the present invention, the motion detecting means, Fi previously input - not a repeat of field Fi - if field of the video signal is input, delayed by a video signal delay means Detecting a motion between the video signal of the input field and the video signal of the field before the n-th frame (where n is an arbitrary natural number) from the input field; Update the contents of the motion memory. Then, in response to the content detected by the field jump detecting means, for a field which is not a repetition of the field input immediately before, the motion detected by the motion detecting means is regarded as the motion of the video signal of the field. For the field which is a repetition of the field which is output and input immediately before, the motion stored in the motion memory is output as the motion of the video signal of the field. For example, when the same field is successively input a plurality of times, as in the case of the same field, not only the field which is not the repetition of the field input immediately before but also the field which is the repetition of the field input immediately before The correct movement can be output for the field.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the motion detection circuit according to the present invention will be described below with reference to application to a VTR.

First, the configuration of the VTR according to this embodiment is shown in FIG.
Shown in

FIG. 4 shows, as an example, a video reproduction system of a VTR which performs recording and reproduction according to the D2 format of the SMPTE standard. According to the D2 format, a video signal is recorded on a tape as digital data.

In the figure, 800 is a tape, 801 is a magnetic head, 802 is a decoded full-contract for rearranging data according to the standard and correcting and correcting data errors, and 110 is at least 4 files. A memory delay line for -field, 130 is a field jump detection circuit. The decoded dish full console 802 outputs the reproduced video data to the memory delay line 110 and the reproduced field number to 130. The field number is
A sequential number of the field recorded on the tape together with the video data of the field at the recording position of the field.

Further, 100 is a motion detecting circuit, 810 is a motion adaptive Y / C separation circuit, 820 is a motion adaptive field conversion circuit, 830 is a D / A conversion circuit, and 813 and 82.
2, 826 is a multiplexer. Motion adaptive Y / C
The separation circuit 810 includes a two-dimensional Y / C separation circuit 811 and a three-dimensional Y / C separation circuit 812, controls the multiplexer 813 according to the amount of motion detected by the motion detection circuit 100, and Either 811 or the output of the three-dimensional Y / C separation circuit 812 is output. The motion adaptive field conversion circuit 820 includes a luminance signal intra-field conversion circuit 821, a luminance signal inter-field conversion circuit 823, a color difference signal intra-field conversion circuit 824, and a color difference signal inter-field conversion circuit. A conversion circuit 825 is provided, and multiplexers 822 and 826 are provided according to the amount of motion detected by the motion detection circuit 100.
And outputs the outputs of the inter-field conversion circuits 823 and 825 or the intra-field conversion circuits 821 and 824. The D / A conversion circuit converts the video data into an analog signal and outputs it.

Next, details of the memory delay line 110, the motion detection circuit 100, and the field jump detection circuit 130 will be described.

FIG. 1 shows the internal configuration of the motion detection circuit 100 together with the memory delay line 110 and the field jump detection circuit 130.

In FIG. 1, reference numeral 101 denotes an input terminal of video data reproduced from a tape 800, 102 denotes an input terminal to which a field number of video data input to the input terminal 101 is input, and 103 denotes a VTR or the like. An input terminal 104 for inputting the reproduction mode of the digital camera is provided with a motion-adaptive Y /
An output terminal for outputting to the C separation circuit 810 and an output terminal 105 for outputting the detected motion signal to the motion adaptive field conversion circuit 820.

Reference numeral 110 denotes a memory delay line for appropriately delaying video data input from the input terminal 101 and outputting data necessary for motion detection in accordance with the reproduction state of the video data.
Reference numeral 1 denotes an output terminal for directly outputting the reproduced video data input from the input terminal 101 from the memory delay line 110;
Reference numeral 2 denotes an output terminal for outputting video data one frame before the video data output from the output terminal 111 or video data corresponding thereto from the memory delay line 110;
Represents two frames of video data output from the output terminal 111.
This is an output terminal for outputting video data before the program or corresponding video data from the memory delay line 110.

Reference numeral 120 denotes an edge detection circuit for detecting an edge portion of a picture pattern of video data, and 130 denotes a fi eld of video data.
A field jump detection circuit for inputting a field number and a playback mode and detecting occurrence of repeated playback of a video, etc.
Reference numeral 41 denotes an LPF that passes only a signal in a frequency range lower than an arbitrary frequency.

142 and 143 are subtractors, 144 and 145
Is an absolute value circuit that performs absolute value processing on input data;
Reference numerals 146 and 147 denote motion signal conversion circuits 820 and 148 for converting an input signal in accordance with the edge information detected by the edge detection circuit 120. A synthesizing circuit for synthesizing by weighting with an arbitrary coefficient value, 149 is a noise removing circuit, 151, 1
Reference numeral 52 denotes a delay line for one clock when the motion signal is sampled at a frequency four times the frequency of the subcarrier.
4 is a coefficient unit having an arbitrary coefficient value α, 155 is a delay line 15
1 is a synthesizing circuit for synthesizing the outputs of the coefficient units 153 and 154 with arbitrary weights, 161 is a 1H delay line, 162
Is a combining circuit that combines the output of the combining circuit 155 and the output of the delay line 161 with an arbitrary weight.
172 is a coefficient unit having an arbitrary coefficient value β, 17
Reference numeral 3 denotes a motion synthesis circuit that synthesizes the output of the noise removal circuit 149 and the output of the coefficient unit 172 with an arbitrary weight.

The operation of the memory delay line 110, the motion detection circuit 100, and the field jump detection circuit 130 will be described below.

The video data reproduced from the tape 800 is input to the reproduced video data input terminal 101, and
The field number is input to a field number input terminal 102.

The field number of the video data input to the input terminal 102 is the field jump detection circuit 13
Input to 0. In the field jump detection circuit 130, the field number of the current field input from the input terminal 102 and the field number 1 input from the input terminal 102 and stored in the field jump detection circuit 130 are stored.
By comparing with the field number of the previous field, it is shown that the reproduction mode input from the input terminal 103 is the forward reproduction, and the field number of the previous field is indicated. On the other hand, if the field number of the current field is advanced by one, it is determined that normal reproduction is performed. If the field number is advanced by two or more, fast forward reproduction is performed.
Judge as motion reproduction.

Also, it indicates that the reproduction mode input from the input terminal 103 is reverse reproduction, and the field number of the current field is different from the field number of the previous field. If-is returned by one or more, it is determined to be reverse fast-forward reproduction including -1x speed reproduction, and if not returned, it is determined to be slow-motion reproduction including stills. Circuit 155, 1
62, a coefficient unit 172, a motion synthesis circuit 173, and the like.

The video data input to the input terminal 101 is input to the memory delay line 110. In the reproduced video data, since the scanning lines are interlaced for each field, a signal having a difference of 2 fields (1 frame) or 4 A signal having a field (2 frame) difference is required. Therefore, the memory delay line 1
In step 10, the information of the field jump is input from the field jump detection circuit 130 so as to be able to perform the correct motion detection even if the field sequence is deviated during the special reproduction, and the information is appropriately adjusted internally. Output terminals 111 and 11 of the memory delay line 110
The video data of the current field from 1 and 2 respectively, 1
The video data corresponding to the video data before the frame and the video data corresponding to the video data before the two frames are output.

The delay processing of the memory delay line 110 will be described with reference to FIG.

In FIG. 2, (a) shows video data input from the input terminal 101, and (d), (b) and (e)
(C) is a field for storing video data for one field.
Memory.

Also, each of 201 to 296 is 1
This is video data of the field, and the numbers in the figure indicate the field numbers of the video data. In the figure,
Time changes from top to bottom. That is, in the figure,
Each video data in the same row indicates the input video data at the same time and the delayed video data stored in each field memory, and the data in the row below the input video data is the input video data at the time after the lapse of one field equivalent time. 5 shows video data and delayed video data stored in each field memory.

In the figure, (A) shows a case of normal reproduction, and (a) is temporally continuous video data from 201 to 205.

These video data 201 to 205 are output from the output terminal 111 of FIG. 1 as the video data of the current field. FIGS. 2A and 2B store video data for performing a subtraction process on the signals of FIGS. 2A and 2A to detect a motion signal having a difference between one frame. (A) for normal playback
The video data of (a) is stored in a field memory (d) (b)
The video data 211 is output from the output terminal 112 in FIG. 1 at the same timing as the video data 201, and the video data 212 is output at the same timing as the video data 202.

FIGS. 2A and 2C show image data for detecting a motion signal of a difference between two frames by performing a subtraction process on the signals of FIGS. 2A and 2A. The video data of b) is sequentially shifted with the field memories (e) and (c), and further delayed by two fields. Video data 22
1 is output from the output terminal 113 of FIG. 1 at the same timing as the video data 201 and 211, and the video data 222 is output at the same timing as the video data 202 and 212.

According to the above processing, (d) indicates that the memory delay line 110
(B) stores video data delayed by one frame (two fields) in the memory delay line 110, and (e) stores video data delayed in the memory delay line 110.
Store the video data delayed by 3 fields in (c)
Means that video data delayed by two frames (four fields) by the memory delay line 110 is stored.

Next, FIG. 2B shows a case of slow motion reproduction, and FIGS. 2B and 2A show video data inputted from the input terminal 101, which is temporally from 250 to 257. Continuous video data, 251 to 254 are video data of the same field, and 255 to 257 are video data of the same field. These video data are output as they are from the output terminal 111 of FIG. 1 as video data of the current field as in the case of normal reproduction.

FIGS. 2B and 2B show video data for detecting a motion signal of one frame difference by performing a subtraction process on the video data of FIGS. 2B and 2A. However, during the special reproduction, the video data necessary for performing the correct motion detection processing is created by simply shifting the video data of (B) and (a) sequentially in the field memory as in the normal reproduction. It is not possible.

Accordingly, the field jump detection circuit 1
If the field jump information from 30 indicates special reproduction such as slow motion, memory delay processing according to the reproduction mode is required.

Therefore, for example, in the case of slow motion reproduction as shown in FIG. 2 (B), the video data of (B) and (a) are sequentially input to the field memory (d). , Delayed by one field. And then,
Only the video data 281 and 285 immediately before the change of the field number among the video data of the field memory (d) are written into the next-stage field memory (b). On the other hand, the field memory (b) holds the written video data from (d) until the next data is written.

Similarly, field memories (b) and (e)
Also, of the video data, only the video data 260, 262, 290, and 292 immediately before the field number changes are written to the next-stage field memory. The field memories (e) and (c) also hold the written video data until the next data is written.

Of the video data in the field memory, video data 281 and 28 immediately before the field number changes.
The writing of 5, 260, 262, 290, and 292 may be performed by writing to the next-stage field memory at the timing of the input video data (a) 251 and 255 immediately after the change of the field number.

The output terminal 112 shown in FIG.
The contents stored in the field memory (b) are output.
Similarly, the contents of the fourth-stage field memory (c) are output from the output terminal 113.

By performing the above processing, (B)
Immediately after the field of the input video data of (a) changes, that is, (B) immediately after the field number of the video data of (a) changes, the image of the different field is stored in each field memory. The data can be arranged in the order of input, and video data having a correct difference between one frame and a difference between two frames can be obtained.

However, in the input video data of (B) and (a), a correct 1 is set except immediately after the change of the field number.
Video data of the difference between frames cannot be obtained. Therefore, correct motion detection cannot be performed. Therefore, the amount of movement immediately after the change of the field by the processing described later is set as the amount of movement until the next change of the field number.

It is to be noted that the video data input from the reproduced video terminal 101 is not a signal for interlacing the scanning lines for each field, but a method for interfacing the same place in each field. In the case of video data, motion detection can be performed using video data having a difference between one field and three fields. However, in this case, the same operation as the above-described memory delay processing is required during special reproduction.

Now, referring to FIG.
Output terminal 111, 112, 113 output video data of the current field, video data corresponding to the video data before one frame, and video data corresponding to the video data before the two frames. . The video data of the current field output from the output terminal 111 is output to the edge detection circuit 12.
0 and input to the subtractors 142 and 143. The video data output from the output terminal 112 and delayed by one frame is input to the subtractor 142,
In step 2, a subtraction process is performed on the video data of the current field output from the output terminal 111, and a motion signal having a difference between one frame is detected.

Similarly, the 2 output from the output terminal 113
The video data delayed by the frame is input to the subtractor 143, and the subtractor 143 performs a subtraction process on the video data of the current field output from the output terminal 111, and performs two-frame subtraction.
The motion signal of the difference between the programs is detected. However, when the video data input to the reproduced video data input terminal 101 is a composite signal in which a chrominance signal and a luminance signal are multiplexed, such as in the NTSC system, the phase of the subcarrier that carries the color difference signal for each frame is changed. Since the motion signal is inverted, the motion signal of the difference between one frame includes an erroneous color difference signal component difference. Therefore, the output of the subtracter 142 is input to the LPF 141,
In F141, the color signal component is removed.

When the video data input to the reproduced video data input terminal 101 is non-multiplexed video data such as a component signal, the LPF 141 becomes unnecessary.

The video data of the current field, which is output from the output terminal 111 and input to the edge detection circuit 120, detects the edge of the picture of the video data by this circuit and outputs the edge information. The difference between one frame output from the LPF 141 and the subtractor 143, and 2
The motion signal of the difference between frames is supplied to absolute value circuits 144 and 145.
After the absolute value processing is performed in Steps (1) and (2), the signals are input to the motion signal conversion circuits 146 and 147, respectively.

The motion signal conversion circuits 146 and 147 convert the input motion signal having the difference between one frame and the difference between two frames according to the edge information detected by the edge detection circuit 120. That is, when motion detection of video data is performed, an edge portion of a picture pattern is often erroneously detected as motion, and this erroneous motion detection of the edge portion has a bad influence on the motion adaptive field conversion circuit 820 and the like. large. Therefore, for a location determined to be an edge portion by the edge detection circuit 120, a process for reducing the amount of motion detected according to the strength of the edge detected by the edge detection circuit 120 even when motion is detected is performed. Do. By the conversion processing in the motion signal conversion circuits 146 and 147, adverse effects caused by erroneously detecting an edge portion of a pattern of video data as a motion are reduced.

The difference between one frame and the two frames subjected to the motion signal conversion processing by the motion signal conversion circuits 146 and 147.
The motion signal of the difference between the signals is input to the synthesizing circuit 148, and is synthesized with an arbitrary weight. In this embodiment, synthesis is performed by an averaging method in which the output of the motion signal conversion circuit 146 and the output of the motion signal conversion circuit 147 are added at a ratio of 1: 1. The motion signal synthesized by the synthesis circuit 148 is input to the noise removal circuit 149.

Next, the noise removing circuit 149 in the motion detecting circuit 100 will be described.

FIG. 3 shows the configuration of the noise removal circuit 149.

In FIG. 3, reference numeral 301 denotes the combining circuit 1 of FIG.
Input terminals to which the motion signal output from 48 is input, 3
Reference numeral 02 denotes an output terminal from which a motion signal after removing the influence of noise or the like is output, 311 and 312 denote 1H delay lines, and 321 denotes a synthesis circuit. The motion signal input from the input terminal 301 in this circuit is input to the synthesizing circuit 321 together with the signal delayed by 1H through the delay line 311 and the signal further delayed by 1H through the delay line 312.

The synthesizing circuit 321 selects one of the three input motion signals or multiplies each of the motion signals by an arbitrary coefficient value and adds them. That is, thereby, the correlation in the vertical direction of the detected motion signal is checked, and a prominent signal as compared with the upper and lower motion signals is removed as noise or the like. The video data reproduced from the tape 800 has a continuous waveform in the scanning line direction, that is, the horizontal direction on the screen, and when noise or the like is superimposed on the video data waveform, the influence of the noise or the like is displayed on the screen. Spread in the horizontal direction, and its influence does not spread in the vertical direction on the screen. By performing such processing, the influence of noise and the like can be reduced.
The output signal of the synthesizing circuit 321 is output from the output terminal 302 as a motion signal from which noise and the like have been removed.
Is input to the motion synthesizing circuit 173 together with the output of.

In FIG. 1, the motion synthesizing circuit 173 outputs the field output from the field jump detecting circuit 130.
According to the field jump information, when the reproduction is not slow motion (when the field number changes sequentially), the output of the noise removal circuit 149 and the coefficient unit 1 are output.
72, and outputs a motion signal obtained by synthesizing the output of
In the case of motion reproduction (when the same field number is continuous), the output of the coefficient unit 172 is output as it is. In this embodiment, when the reproduction is not slow motion reproduction, a process of selecting and outputting the larger one of the output of the noise removal circuit 149 and the output of the coefficient unit 172 is performed.

The synthesizing circuit 155 includes a motion synthesizing circuit 173.
A delay circuit 151 delays the motion signal output from the motion signal output from the motion signal output from the motion synthesizer 173 by attenuating the motion signal output from the motion synthesizer 173 by one clock with a clock having a frequency four times that of the subcarrier. The motion signal
After delaying the motion signal output from the motion synthesis circuit 173 by two clocks with a clock having a frequency four times the subcarrier frequency by the delay circuits 151 and 152, the motion signal subjected to the attenuation processing by the coefficient unit 154 is input. You. However, in this embodiment, it is assumed that video data obtained by sampling an analog video signal at four times the frequency of the subcarrier is used for recording.

In this synthesizing circuit, according to the field jump information output from the field jump detecting circuit 130, in the case of slow motion reproduction, the delay circuit 151 is used.
Is output as is. If the playback is not slow motion, three motion signals are synthesized and output. In the present embodiment, the largest one of the three motion signals is selected and output as the synthesizing process in the case of not slow-motion reproduction. If it is not slow motion playback,
These delay circuits 151 and 152, coefficient units 153 and 154,
The synthesizing circuit 155 operates as a horizontal filter that attenuates and widens the detected motion in the horizontal direction.

The motion signal output from the synthesizing circuit 155 is output from the output terminal 104 connected to the motion adaptive Y / C separation circuit 810 to control the motion adaptive circuit 810, and at the same time, is delayed by 1H by the delay circuit 161. The signal is input to the synthesis circuit 162 together with the motion signal. This combining circuit 162
According to the field jump information output from the field jump detecting circuit 130, the output of the synthesizing circuit 155 and the delay circuit 161 are used in the case of slow motion reproduction.
Is output alternately for each field, and the slow mode
Otherwise, the two motion signals are combined and output. However, in this embodiment, the speed
In the case of non-motion reproduction, the largest one of the two motion signals is selected and output as a synthesis process.

The motion signal output from the synthesizing circuit 162 is output from the output terminal 105 connected to the motion adaptive field conversion circuit 820 to control the motion adaptive field conversion circuit 820 and to the delay circuit 171. Is entered.

On the other hand, in the delay circuit 171, the output of the coefficient unit 172 is compared with the output of the noise removal circuit 149 by one filter.
A delay process is performed on a motion signal input so as to be delayed by an amount (262H or 263H) corresponding to a field, and the delayed motion signal is input to the coefficient unit 172. The motion signal input to the coefficient unit 172 is converted into a slow motion signal in accordance with the field jump information output from the field jump detection circuit 130.
In the case of motion playback, the input motion signal is
If the reproduction is not slow motion reproduction, the data is attenuated by an arbitrary coefficient value and output. The motion signal output from the coefficient unit 172 is input to the motion synthesis circuit 173 as described above.

As described above, in this embodiment, according to the field jump information output from the field jump detection circuit 130, the same slow motion reproduction is performed.
Motion synthesis circuit 173, synthesis circuit 155, synthesis circuit 16
2. The coefficient unit 172 is controlled, and the delay line 151 and the delay line 16 are controlled.
1. The delay line 171 functions as a field memory for storing one field of motion signal.
The output of the field memory composed of 1, 161 and 171 is directly fed back to the motion synthesis circuit 173.

That is, in the slow motion reproduction as shown in FIG. 2B, for the video data 251 immediately after the change of the field number, the motion is correctly detected, and the detected motion signal is transmitted to the delay circuit. 151, 15
2. A filter consisting of coefficient units 153 and 154 and a combining circuit 155, and a filter consisting of a delay circuit 161 and a combining circuit 162, are spatially expanded and output, and are stored in a field memory consisting of the delay lines 151, 161 and 171. The detected motion signal is stored.

For the video data other than immediately after the change of the field number for which the motion cannot be correctly detected, the video data immediately after the change of the field number is obtained, and the delay lines 151, 161 and 17 are obtained.
The motion signal stored in the field memory consisting of 1 is repeatedly used as it is.

Accordingly, a correct motion detection result can be always obtained, and erroneous control of the motion adaptive Y / C separation circuit 810 and the motion adaptive field conversion circuit 820 can be prevented.

Further, by adopting a circuit configuration for attenuating and detecting the motion signal detected during the normal reproduction as in the present embodiment, the detected motion signal can be further reduced in the horizontal and vertical directions. It is possible to widen by several fields in the time axis direction according to the coefficient value of the coefficient unit 172, so that the omission of detection of motion in video data or the like in which a pattern changes in two field periods is greatly reduced. Can be reduced.

In this embodiment, the D2 format V
Although the motion detection circuit has been described taking the application to the TR as an example, the motion detection circuit according to the present embodiment is a digital VT of another system.
In addition to the R and analog VTRs, the present invention can be similarly applied to other video storage and playback devices such as an optical disk device and a magneto-optical disk device. In addition to NTSC signals, PAL,
The same can be applied to video signals of other systems such as SECAM.

[0088]

As described above, according to the motion detecting circuit of the present invention, even when the same field is repeatedly reproduced for a certain period, the motion of the reproduced video signal is correctly detected. And a motion detection circuit capable of performing the motion detection.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a motion detection circuit according to one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing an operation of a memory delay line according to one embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a noise elimination circuit according to one embodiment of the present invention.

FIG. 4 is a block diagram showing a part of the configuration of a VTR according to one embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a conventional motion detection circuit.

FIG. 6 is an explanatory diagram showing a motion adaptive field conversion process.

FIG. 7 is an explanatory diagram showing a conventional motion detection operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 101 Video data input terminal 102 Field number input terminal 103 Reproduction mode signal input terminal 104, 105 Motion signal output terminal 110 Memory delay line 120 Edge detection circuit 130 Field jump detection circuit 141 Low-pass filter 142, 143 Subtractors 144, 145 Absolute value circuits 146, 147 Motion signal conversion circuits 148 Synthesis circuits 149 Noise removal circuits 151, 152 Delay circuits 161, 171 Delay circuits 153, 154 Coefficient units 172 Coefficient units 155, 162 Motion synthesis circuits 173 Motion synthesis circuits 800 tape 810 motion adaptive Y / C separation circuit 820 motion adaptive field conversion circuit

Continued on the front page (72) Inventor Kyoichi Hosokawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Hitachi Video Media Laboratory (72) Inventor Miyoko Yoshikoshi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Hitachi, Ltd. (72) Inventor Kotaro Okiguchi 2-15-12 Nishi-Shimbashi, Minato-ku, Tokyo Hitachi, Ltd. Home Appliances Business Unit High-vision Strategy Development Division (56) References JP-A-61-56584 ( JP, A) JP-A-63-61586 (JP, A) JP-A-62-128288 (JP, A) JP-A-63-245083 (JP, A) JP-A-1-212187 (JP, A) (58) ) Surveyed field (Int.Cl. ⁶ , DB name) H04N 5/91-5/956 H04N 7/00-7/015

Claims (8)

(57) [Claims] 1. A motion detection circuit for inputting a video signal constituting one frame from two fields and detecting a motion of the input video signal, wherein the video signal delay means delays the input video signal. A motion memory for storing the motion of the video signal for one field, and a field to which the input video signal belongs,
A field jump detecting means for detecting whether or not the field input immediately before the field is repetitive; and when a video signal of a field which is not a repetition of the field input immediately before is input. From the input field delayed by the video signal delay means, n
(Where n is an arbitrary natural number) Motion detecting means for detecting the motion between the video signal of the input field and the video signal of the field before the frame, and updating the content of the motion memory. In accordance with the content detected by the field jump detecting means, for a field which is not a repetition of the field input immediately before, the motion detected by the motion detecting means is used as the motion of the video signal of the field. Output, a field that is the repetition of the field just entered
And selecting means for outputting the motion stored in the motion memory as the motion of the video signal of the field. 2. A motion detection circuit for inputting a video signal constituting one frame from two fields and detecting a motion of the input video signal, wherein a motion of the video signal for one field is detected. A motion memory to be stored, a field jump detecting means for detecting whether a field to which an input video signal belongs is a repetition of a field input immediately before the field, and a field jump detection According to the detected contents of the means,
Only the video signal of the field that is not a repetition of the field
Video signal delay means for delaying a video signal by at least one frame, which is delayed by one field at the timing of input of a field which is not a repetition of the immediately preceding field, and a field input immediately before input Video signal delay means for a video signal in a field which is not a repetition of a field
At least the motion with respect to the video signal of the field delayed by the frame is detected, and the motion is input immediately before according to the motion detecting means for updating the contents of the motion memory and the field jump detecting means. For a field which is not a repetition of the field, the motion detected by the motion detecting means is output as the motion of the video signal of the field, and the field which is a repetition of the field input immediately before is output.
And selecting means for outputting the motion stored in the motion memory as the motion of the video signal of the field. 3. A motion detecting circuit for inputting a video signal constituting one frame from two fields and detecting a motion of the input video signal, wherein the video signal delay means delays the input video signal. A motion memory for delaying the motion of the video signal for one field by one field, and a field to which the input video signal belongs is a field which is input immediately before the field.
A field jump detecting means for detecting whether or not the field is repeated; and, when a video signal of a field which is not a repetition of the field input immediately before is input, the video signal of the input field is detected. The motion with respect to the video signal of the field one frame before the input field and the motion with respect to the video signal of the field two frames before the frame delayed by the video signal delay means. And a field which is a repetition of the field input immediately before, in accordance with the detection content of the field jump detecting means.
The motion delayed by the motion memory is output, and for a field which is not a repetition of the field input immediately before, the motion output by the motion detecting means and the motion delayed by the motion memory are combined at a predetermined ratio. And a field that is not a repetition of the field that was input immediately before, according to the detection result of the field jump detection means.
As for the field, the motion output from the synthesizing circuit is subjected to a filter process for expanding the surrounding space on the image plane, the motion is output as the motion of the video signal of the field, and the motion is input to the motion memory. And a filter circuit for outputting the motion output from the synthesizing circuit as the motion of the video signal of the field for the field which is a repetition of the field and inputting the motion to the motion memory. 4. The motion detection circuit according to claim 3 , wherein the video signal is digital data obtained by sampling an analog video signal at a predetermined frequency, and the filter circuit detects the field jump. Depending on the detection content of the means, a field that is not a repetition of the field entered immediately before
For the field, a filter that expands the movement of the video signal in the horizontal direction on the image plane by convolving the data of the video signal with the value of the data and the value of the data that is in front and back in the horizontal direction on the field image plane. A motion detection circuit for performing processing and outputting the result as the motion of the video signal of the field. 5. The motion detection circuit according to claim 3 , wherein the video signal is digital data obtained by sampling an analog video signal at a predetermined frequency, and the filter circuit detects the field jump. Depending on the detection content of the means, a field that is not a repetition of the field entered immediately before
For the field, by convolving the data of the video signal with the value of the data which is vertically or vertically positioned on the field image plane, the movement of the video signal is vertically A motion detection circuit for performing a filtering process for expanding the video signal and outputting the result as the motion of the video signal of the field. 6. A recording medium for recording a video signal constituting one frame from two odd fields, reproducing means for reproducing a video signal stored in the recording medium, and a video signal reproduced by the reproducing means. And detecting the movement of the input video signal .
2. The motion detection circuit according to claim 1; display means for displaying an image represented by a video signal reproduced by said reproduction means; and an output of the motion detection circuit such that an odd field is displayed on said display means alternately. In-field conversion processing for converting field odds using the video signal in the same field according to the motion of the field, and converting field odds using the video signal of the adjacent field A video recording / reproducing apparatus having a motion-adaptive field conversion means for switching and executing a field-to-field conversion process. 7. A recording medium for recording a composite video signal in which a luminance component signal and a chrominance component signal are multiplexed, and a video signal stored in the recording medium. reproducing means for reproducing, enter a video signal reproducing means is reproduced, any claims 1, 2, 3, 4 and 5 for detecting the motion of an input video signal
And separating the luminance component and the color component of the video signal reproduced by the reproducing means by using the video signal in the same field in accordance with the motion output from the motion detecting circuit. Switching between the two-dimensional Y / C separation processing to be performed and the three-dimensional Y / C separation processing for separating the luminance component and the color component of the video signal reproduced by the reproducing means using the video signal of the adjacent field. A video recording / reproducing apparatus, comprising: a motion adaptive Y / C separating unit for performing the operation; 8. A video recording / reproducing apparatus according to claim 6 , wherein said recording is a magnetic tape, and more particularly, a video tape reproducing apparatus. -Da.