JP3161229B2 - Video signal processing method and video signal processing 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 device for transmitting or recording a video signal, and a device for reproducing the recorded video signal.

[0002]

2. Description of the Related Art At present, a TV signal has a frame unit (on a
frame by frame basis).
Each frame is composed of two fields. Further, the horizontal line of one field in the frame is located between two adjacent horizontal lines on the screen of the other field. It is well known that such a relationship between fields is called an interlace.

For this reason, in a device for recording or transmitting a video signal, an input video signal is converted to an interlace signal (interlace signal).
d signal). In such an apparatus, two fields in a frame are interlaced and output during reproduction. Further, when recording or transmitting not only moving images but also still images, slow and still reproduced images, the processing is executed in units of one frame.

[0004]

However, such a conventional video signal recording apparatus or reproducing apparatus has the following problems. (1) In a home video game machine, etc., in order to prevent flicker between fields due to interlacing, two frames in a frame are used.
The corresponding horizontal line of the field is set at the same position on the screen. Such a relationship between fields is called non-interlace. However, flickering occurs when data obtained by transmitting or recording such a video signal is interlaced and output.
(2) When recording a still image with a camera or the like, there is a case where a still image of one field is stored in a memory once and then transmitted or recorded over a plurality of field periods. When such data is interlaced and output, flicker occurs as in (1). (3) When the recorded TV signal is subjected to slow or still reproduction in field units, data of the same field is reproduced over a plurality of field periods. When such a slow or still reproduction signal is transmitted or recorded again, if interlaced and output, a flicker occurs as in (2). (4) When a still image and a moving image are mixedly recorded, it is not possible to determine whether to output as a still image or a moving image when reproducing. Further, at the time of slow or still reproduction, it cannot be determined whether to reproduce as a still image in a field unit or as a still image in a frame unit. (5) When a still image is being reproduced and a reproduction error occurs and error correction is performed, there is a possibility that there is no correlation with an adjacent frame, so inter-frame correction cannot be performed. Alternatively, there is a possibility that the image quality may be largely deteriorated by the inter-frame modification. (6) When a still image is recorded in units of a plurality of frames, it is not possible to determine from which frame the next still image starts, so frame advance for each still image cannot be performed. (7) When replaying data that has been recorded or transmitted with slow or still reproduced data, it becomes impossible to distinguish whether the recorded data is normal reproduction data or slow or still reproduction data.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the conventional video signal recording apparatus, and when recording, transmitting and reproducing a video signal, it is possible to perform optimal reproduction according to the type of the input video signal. It is an object of the present invention to provide a video signal processing method and a video signal processing device.

[0006]

Means for Solving the Problems In the first invention,
The video signal processing device sets the interlace flag to a value indicating non-interlace when the input video signal is a non-interlace signal, and sets the interlace flag to a value indicating interlace when the input video signal is an interlace signal. , A multiplexing unit that multiplexes the interlace flag with video information of a corresponding frame, and a unit that transmits or records the multiplexed data.

In the second invention, the video signal processing device sets the still image flag to a value indicating a still image when the image of each frame of the input video signal is stationary between two fields in the frame. A still image flag setting means for setting the still image flag to a value indicating a moving image when moving between two fields in the frame; and setting the still image flag in video information of a corresponding frame. Multiplexing means for multiplexing, and means for transmitting or recording the multiplexed data.

In a third aspect of the present invention, the video signal processing device transmits or records a still image video signal, and the video signal recording device transmits n frames (n is an integer of 2 or more) of one frame of a still image. The frame is repeatedly encoded for each frame or more, and the value of the frame change flag for the first frame of the n-frame period is set to a value indicating that the current frame and the previous frame are different still images. Frame change flag setting means for setting the value of the frame change flag for the second and subsequent frames to a value indicating that the current frame and the previous frame are the same still image, and an image of the frame corresponding to the frame change flag A multiplexing unit for multiplexing the information with information; and a unit for transmitting or recording the multiplexed data.

[0009]

According to the first aspect of the present invention, it is determined whether an input signal is an interlace signal or a non-interlace signal, and the information is transmitted simultaneously with the video signal.
Thus, even when a home video game machine or the like is transmitted or recorded, it is possible to appropriately select whether to output in an interlaced or non-interlaced manner on the reproducing side.

Further, when a still image is input by a camera or the like, when a still image of one field is stored in a memory once, and then transmitted or recorded over a plurality of field periods, a , A non-interlaced signal. As a result, even when a still image in a field unit is transmitted or recorded, the still image can be output in a non-interlaced manner, so that the occurrence of flicker can be prevented.

[0011] Further, when transmitting or recording data obtained by slow or still reproduction of the recorded video information in units of fields, it is selected as a non-interlace signal. As a result, even when a slow or still image in field units is transmitted or recorded, the image can be output in a non-interlaced manner, so that flicker can be prevented from occurring.

According to the second aspect of the present invention, the still image flag is transmitted or recorded together with the video data. Therefore, at the time of reproduction, it is possible to determine whether the frame is a moving image or a still image. Therefore, when it is determined that the image is a still image, it is possible to automatically switch to slow or still playback. In the case of slow or still playback, it is possible to select frame-by-frame playback for a still image and field-based playback for a moving image. In particular, data recorded as a still image in an interlaced manner can achieve higher definition reproduction image quality by performing still reproduction in frame units.
In the case of a moving image, flicker and dancing at the time of reproduction can be prevented by selecting still reproduction in units of fields.

Further, when recording a still image, it is possible to prevent the image quality from deteriorating due to a reproduction error by recording the still image continuously for at least three frames or more. In particular, when recording on a VCR, recording is interrupted each time a still image is recorded. For this reason, the reproduction error probability at the interruption point increases,
By continuously recording a series of still images, error correction between frames becomes possible.

Further, according to the third aspect of the present invention, the time at which the frame changes is transmitted or recorded using the frame change flag. For this reason, at the time of reproduction, the change point of the still image can be determined by the frame change flag.
Frame advance for each still image can be easily realized. In addition, since the range of the same frame can be detected by the frame change flag, even when performing inter-frame retouching between adjacent frames, retouching can be performed in the same still image, so that image quality deterioration due to error retouching can be prevented. .

Further, according to the present invention, when slow / still reproduction is performed, a change in a reproduced frame is transmitted or recorded using a frame change flag. Thereby, the reproducing side can determine whether the data input by the frame change flag is the data of the normal reproduction or the data of the slow / still reproduction.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments.

FIG. 1 is a block diagram of a first embodiment of the video signal processing apparatus according to the present invention. In FIG. 1, reference numeral 100 denotes a video input unit, 101 denotes an A / D (analog-digital) conversion unit, 102 denotes a video encoding unit, 103 denotes an interlace flag setting unit, 104 denotes a multiplexing unit, 105 denotes a recording encoding unit, 106 is a magnetic tape, and 110 is a magnetic head.

A video signal input from a video input unit 100 is converted into a digital signal by an A / D conversion unit 101. The converted digital video signal is supplied to a video encoding unit 1
02 is input to the interlace flag setting unit 103.
The video encoding unit 102 encodes the input video signal into a format suitable for recording. As an example of video encoding, encoding using a video compression technique may be used. As a video compression technique, a method may be used in which an input digital video signal is divided into blocks for each adjacent pixel and compressed using orthogonal transform. By using such video coding, the data amount of the input digital video signal can be significantly reduced.

The interlace flag setting unit 103 detects whether two fields in the frame of the input video signal are interlace signals or non-interlace signals, and sets the value of the interlace flag. .

The interlace flag is set in the multiplexing unit 1
At 04, the data is multiplexed with the video data output from the video encoding unit 102. The multiplexed data is transmitted to the recording encoding unit 1
At step 05, error correction coding, modulation coding and the like are performed, and the data is recorded on the magnetic tape 106 by the magnetic head 110.

Here, the multiplexing unit 10 shown in FIG.
4 will be described. FIG. 2 shows an example in which the present invention is applied to a digital video cassette recorder (DVCR). FIG. 2A shows data of one track among diagonal tracks continuously arranged and recorded on a magnetic tape by a DVCR. The data of one track mainly includes an audio sector for recording a digital audio signal, a video sector for mainly recording a digital video signal, and a control sector provided near, for example, both ends of the track and for recording index information and the like. I have. The video sector is shown in FIG.
As shown in FIG. 3, the video data is further composed of video auxiliary data and video data. The video auxiliary data is composed of control data, a time code, and the like necessary for reproducing the video data. In addition, various pieces of flag information are arranged in a part of the video auxiliary data as shown in FIG. In the example of FIG. 2, a 1-bit interlace flag, a 1-bit still image flag, and a 1-bit frame change flag described later are arranged in the video auxiliary data. In this manner, the flag information can be multiplexed and recorded simultaneously with the video data for each track. In the example of FIG. 2, three types of flags are arranged.
It is also possible to multiplex only one or two of these flags. Also, to improve the reliability,
The type flag may be repeatedly recorded at predetermined intervals a plurality of times. The data format of one track is shown in FIG.
However, the present invention is not limited to the above.

With such a configuration, even when the input video signal is a non-interlaced signal like the output of a video game machine, the information can be determined at the time of reproduction. This can prevent distortion such as flicker caused by interlaced output.

FIG. 3 shows an example of the interlace flag setting section 103. 3, reference numeral 201 denotes a V blanking waveform detection unit, 202 denotes a memory, 203 denotes a comparator,
Reference numeral 204 denotes a flag setting.

The video signal input from the video input unit 100 is input to the V blanking waveform detection unit 201. Here, the waveform of the vertical blanking section is extracted and detected.
The detected waveform information is stored in the memory 202. Further, the comparator 203 compares the detected waveform information of the previous field output from the memory 202 with the detected waveform information of the current field output from the V blanking waveform detection unit 201. Here, if the waveforms of the vertical blanking section in both fields are different, it is determined that the signal is an interlace signal. The flag setting unit 204 sets the value of the interlace flag to “1” when it is determined that the signal is an interlace signal in accordance with the output of the comparator 203, and sets it to “0” when it determines that the signal is a non-interlace signal. I do.

According to the method shown in FIG. 3, when the V blanking waveforms of two fields in a frame are the same as in a video game machine, it can be detected that the signal is a non-interlace signal. Further, any method other than the method shown in FIG. 3 can be applied to the interlace flag setting method of the present invention.

Hereinafter, a second embodiment of the video signal processing apparatus of the present invention will be described. FIG. 4 is a block diagram showing an embodiment of the video signal processing device according to the second embodiment. In FIG.
301 is a camera input unit, 302 is a still image switch, 30
3 is a memory, 102 is a video encoding unit, 304 is an interlace flag setting unit, 104 is a multiplexing unit, 105 is a recording encoding unit, 106 is a magnetic tape, and 110 is a magnetic head.

A video signal input from the camera input unit 301 is first stored in the memory 303. Memory 303
Is controlled by the still image type information input from the still image switch 302 attached to the video camera, and outputs the output to the video encoding unit 102. The still image switch 302 is a switch for selecting whether to shoot a still image in a field unit or a still image in a frame unit when a photographer shoots a still image.
The still image type information is information indicating whether the video signal from the camera input unit is a moving image, a still image in field units, or a still image in frame units. The number of still images in field units can be twice as large as the number of still images in frame units. On the other hand, a still image in a frame unit can reproduce higher definition image quality than a still image in a field unit.

Here, when the still image is a field still image, the memory 303 outputs a video signal of one field to the video encoding unit 102 over a plurality of field periods. When the still image is a frame still image, the video signal of one frame is output to the video encoding unit 102 over a plurality of frame periods. Further, when the video signal is a moving image, the video signal of one field is output only for one field period. The video encoding unit 102 encodes the input video signal into a format suitable for recording by compression encoding.

On the other hand, information input from the still image switch input unit 302 is input to the interlace flag setting unit 304. Here, in the case of a field still image, non-interlace is selected and the flag value is set to "0", and in the case of a frame still image or moving image, interlace is selected and the flag value is set to "1".

The interlace flag is multiplexed by the multiplexing unit 104 with the coded video data output from the video coding unit 102. The multiplexed data is converted into a signal suitable for magnetic recording by error correction encoding or modulation encoding in a recording encoding unit 105, and is recorded on a magnetic tape 106 by a recording head 110.

Normally, when a still image in a field unit is output in an interlaced manner, a dancing phenomenon occurs in which the image vibrates up and down between fields. However, with such a configuration, when the same data is repeated in the input video signal in field units, non-interlaced output on the reproducing side can prevent dancing. Further, the input of the present embodiment is not limited to a video camera, and any other device that generates still images can be connected.

Hereinafter, a third embodiment of the present invention will be described.
FIG. 5 is a block diagram showing a third embodiment of the video signal processing device of the present invention. 5, reference numeral 400 denotes a magnetic tape, 120 denotes a reproduction head, 401 denotes a reproduction processing unit, and 402
Is a reproduction state output unit, 102 is a video encoding unit, 403 is an interlace flag setting unit, 104 is a multiplexing unit, 105
Denotes a recording and encoding unit, 106 denotes a magnetic tape, and 110 denotes a magnetic head.

This embodiment is an example in which video data once recorded is reproduced by a reproducing apparatus and recorded again. First, in the playback device, video data recorded on the magnetic tape 400 is played back and output via the playback head 120 and the playback processing unit 401. At the same time, the reproduction state output unit 402 outputs information indicating a reproduction state indicating whether the reproduction apparatus is performing normal reproduction, slow reproduction, or still reproduction.
The playback state output unit 402 determines the playback state from the tape feeding state of the playback device and the processing contents of the playback processing unit 401.

As described above, the video signal output from the playback device is input to the video encoding unit 102. The video encoding unit 102 compresses the input video signal by compression encoding.
Encode into a format suitable for recording.

At the same time, the playback state information output from the playback device is input to the interlace flag setting unit 403.
When the playback state is field slow or field still, the interlace flag setting unit 403 selects non-interlace and sets the interlace flag value to “0”, and otherwise selects interlace. Set the interlace flag value to “1”.

The interlace flag is multiplexed by the multiplexing unit 104 with the coded video data output from the video coding unit 102.

The multiplexed data is transmitted to the recording encoding unit 10
At 5, the signal is encoded into a signal suitable for magnetic recording by error correction encoding or modulation encoding, and is recorded on the magnetic tape 106 by the magnetic head 110.

With such a configuration, even when the same data is repeated in the field unit such as a field throw or a field still, the non-interlaced output is performed on the reproducing side. Thereby, distortion such as dancing can be prevented. Further, when the video signal is output as it is from the playback device in an encoded state, the encoding process in the video encoding unit 102 can be bypassed.

Hereinafter, a fourth embodiment of the present invention will be described. FIG. 6 is a block diagram of a fourth embodiment of the video signal processing device of the present invention. 6, reference numeral 106 denotes a magnetic tape; 130, a reproducing head; 501, a recording / decoding unit;
Denotes an interlace information separation unit, 503 denotes an interlace flag determination unit, 504 denotes a video decoding unit, 505 denotes an output method selection unit, and 506 denotes a video output unit.

This processing apparatus reproduces video data recorded by the processing apparatus shown in FIG. 1, FIG. 4 or FIG. A reproduction signal reproduced from the magnetic tape 106 by the reproduction head 130 is demodulated, detected, and error-corrected by the recording / decoding unit 501 and decoded into digital data. The decoded data is supplied to the interlace flag separating unit 5.
At 02, video data and an interlace flag are separated. The separated video data is decoded into a video signal for each field by a video decoding unit 504, and the output method selecting unit 5
05 is input.

On the other hand, the interlace flag determination unit 503 determines whether the recorded video data is an interlace signal or a non-interlace signal, based on the interlace flag. Here, if it is determined that the signal is an interlace signal, the output method selection unit 505
The video signal is interlaced and output to the video output unit 506. Conversely, when it is determined that the signal is a non-interlaced signal, the output method selecting unit 505 deinterlaces the video signal and outputs the signal to the video output unit 506.

With such a configuration, reproduction can always be performed in the same state as that input during recording, so that it is possible to suppress occurrence of distortion such as dancing and flicker. Further, as an output method when decoding is performed with non-interlace, various other methods can be applied.

FIG. 7 shows the output method selection unit 505 shown in FIG.
It is a block diagram of one Example. In FIG.
Is a selector, and 604 is an inter-line filter unit.

The decoded video signal output from the video decoding unit 504 is supplied to a selector 602 and an inter-line filter 60.
4 is input. The inter-line filter 604 performs a filtering process between adjacent lines of the input video signal,
Adjust so that the line positions between the fields are interlaced. The selector 602 outputs the video data output from the video decoding unit 504 to the video output unit 506 as it is in interlacing according to the information output from the interlace flag determination unit 503. On the other hand, at the time of non-interlace, the video data interlaced by the inter-line filter unit 604 is output to the video output unit 506.

In the embodiment shown in FIG. 7, the use of an interline filter makes it possible to output a non-interlaced signal as an interlaced signal without generating a dance sync.

Hereinafter, a fifth embodiment of the present invention will be described. FIG. 8 is a block diagram showing a fifth embodiment of the video signal processing device of the present invention. 8, reference numeral 301 denotes a camera input unit; 701, a still image button; 702, a memory;
02 is a video encoding unit, 703 is a still image flag setting unit, 1
04 is a multiplexing unit, 105 is a recording and encoding unit, 106 is a magnetic tape, and 110 is a magnetic head.

A video signal input from the camera input unit 301 is first input to the memory 702. Still image button 7
A button 01 attached to the camera is pressed when a still image is shot. As a result, from the still image button 701, “0” is displayed when capturing a still image, and “1” is displayed when capturing a moving image.
Is input to the memory 702 and the still image flag setting unit 703. In the memory 702, when the video type input from the still image button 701 is a moving image, the video signal is set to 1
Output to the video encoding unit 102 in synchronization with the input for each frame. When the video type is a still image, the still image of one frame stored in the memory is repeatedly output to the video encoding unit 102.

The video encoding unit 102 encodes the input video signal into a format suitable for recording by compression encoding, and outputs the encoded signal to the multiplexing unit 104. The still image flag setting unit 703 sets the value of the still image flag to “0” when the video signal is a still image, and sets the value of the still image flag to “1” when the video signal is a moving image. Output to 104.

The encoded video data output from the video encoding unit 102 and the still image flag output from the still image flag setting unit 703 are multiplexed by the multiplexing unit 104 and Is encoded into a signal suitable for magnetic recording by error correction encoding or modulation encoding, and is recorded on the magnetic tape 106 by the recording head 110.

With such a configuration, if the input video signal is a moving image, it is recorded as it is for each frame, and if it is a still image, the same still image is repeatedly recorded. Whether the moving image or the still image is recorded can be detected on the reproducing side by the still image flag transmitted at the same time. Also, the number of times the still image is repeated can be set arbitrarily, and recording of only one frame is also possible.

FIG. 9 is a block diagram of an embodiment of the still image flag setting unit 703. 9, reference numeral 801 denotes a memory; 802, a comparator; 803, a video type selection unit;
4 is a frame number counter.

The video type information input from the still image button 701 is first input to the memory 801. Memory 8
The comparator 802 compares the video type information of the previous frame output from 01 and the video type information of the current frame output from the still image button 701. If the two video types are different, the frame number counter 804
Is reset to 0. However, reset is not performed until the count value becomes 2 or more. Since the frame number counter 804 counts up for each frame, the number of frames (n) after the video type is changed
Output -1 as the count value. Video type selection section 8
In 03, when the count value input from the frame number counter 804 is less than 2, the same video type as the previous frame is output from the output unit 805, and when the count value is 2 or more, the current input Outputs the video type as it is.

By such processing, if three or more frames have not elapsed since the video type was changed, the video type cannot be changed. Therefore, at the time of recording a still image, it is possible to record at least three consecutive frames as a still image.

By setting the still image flag with the configuration as shown in FIG. 9, it is possible to prohibit recording of a completely different still image or moving image for each frame. Generally, when recording is interrupted for each frame by the VCR, the error rate at the interruption point increases. In particular, in still image recording, the still image before and after the interruption is often completely different, so that error correction between frames becomes difficult. For this reason, by limiting the change in the video type, stable still image recording and reproduction can be performed.

Hereinafter, a sixth embodiment of the present invention will be described. FIG. 10 is a block diagram of a sixth embodiment of the video signal processing device of the present invention. 10, reference numeral 301 denotes a camera input unit; 701, a still image button; 702, a memory;
02 is a video encoding unit, 903 is a frame change flag setting unit, 104 is a multiplexing unit, 105 is a recording encoding unit, 106
Is a magnetic tape, and 110 is a magnetic head.

The digital video signal input from the camera input unit 301 is first input to the memory 702. At the time of a frame change indicating the switching of a still image, the change of the still image button 701 is detected and input to the memory 702 and the frame change flag setting unit 903. Here, if the still image button 701 is pressed once, a still image of a specific number of frames is recorded, and if the button is pressed again, the next still image is recorded following the previous still image.

The memory 702 switches the memory output to the output of the next frame at the time of switching of the still image input from the still image button 701 (when the previous frame and the current frame become different still images), and Transformation unit 102
Output to When the frame is not changed, the data of the same frame as the previous output frame recorded in the memory 702 is output to the video encoding unit 102.

The video encoding unit 102 encodes the input video signal into a format suitable for recording by compression encoding and outputs the encoded signal to the multiplexing unit 104. Further, the frame change flag setting unit 903 sets the value of the frame change flag to “0” when the current frame is data of the same frame as the previous frame (when it is the same still image), and the current frame is different from the previous frame. If the data is frame data (if it is a different still image), the value of the frame change flag is set to “1” and the frame change flag is set to the multiplexing unit 10.
4 is output.

The encoded video data input from the video encoding unit 102 and the frame change flag setting unit 903
Is input to the multiplexing unit 104
, And encoded by a recording encoding unit 105 into a signal suitable for magnetic recording, and is recorded on a magnetic tape 106 by a recording head 110.

With such a configuration, it is possible to detect the switching point of the input still image from the frame change flag.

Hereinafter, a seventh embodiment of the present invention will be described. FIG. 11 is a block diagram of a video signal processing apparatus according to a seventh embodiment of the present invention. 11, reference numeral 400 denotes a magnetic tape, 130 denotes a reproduction head, 401 denotes a reproduction processing unit,
02 is a reproduction state output unit, 102 is a video encoding unit, 903
Is a frame change flag setting unit; 104 is a multiplexing unit;
Reference numeral 5 denotes a recording and encoding unit, 106 denotes a magnetic tape, and 110 denotes a magnetic head.

This embodiment is an example showing a case where video data once recorded is reproduced by a reproducing apparatus and recorded again. First, in the playback device, the video data recorded on the magnetic tape 400 is read by the playback head 120 and the playback processing unit 401.
And reproduced and output. At the same time, the playback state output unit 402 outputs information indicating a playback state indicating whether the playback apparatus is performing normal playback, slow playback, or still playback. The playback state output unit 402 determines the playback state from the tape feeding state of the playback device and the processing contents of the playback processing unit 401. Here, the change point of the frame at the time of the throw is also detected.

As described above, the video signal output from the playback device is input to the video encoding unit 102. The video encoding unit 102 encodes the input video signal into a format suitable for recording by compression encoding. Further, frame change point information input from the reproduction state output unit 402 is input to the frame change flag encoding unit 903.
In normal moving image reproduction, frames change in all frames.
Also, at the time of slow or still playback, frames to be played back are switched for each of a plurality of frames, so that the current frame may be the same as or different from the previous frame. The frame change flag setting unit 903 sets the frame change flag to “0” when the current frame is data of the same frame as the previous frame, and sets the frame change flag when the current frame is data of a frame different from the previous frame. The value is set to “1” and the frame change flag is output to multiplexing section 104.

The encoded video data output from the video encoding unit 102 and the frame change flag setting unit 903
Is output from the multiplexing unit 104
, And encoded by a recording encoding unit 105 into a signal suitable for magnetic recording, and is recorded on a magnetic tape 106 by a recording head 110.

With such a configuration, if the input video signal is data that has been subjected to slow or still reproduction, the same frame is recorded continuously over a plurality of frame periods. Since this state can be detected from the frame change flag, it is possible to determine whether normal reproduction or slow or still reproduction has been recorded.

Hereinafter, an eighth embodiment of the present invention will be described. FIG. 12 is a block diagram of an eighth embodiment of the video signal processing device according to the present invention. 12, reference numeral 106 denotes a magnetic tape, 120 denotes a reproducing head, 501 denotes a recording / decoding unit,
1101, a frame change flag separation unit; 1102, a frame change flag determination unit; 1103, an error correction unit;
Denotes a video decoding unit, and 506 denotes a video output unit.

Here, a reproducing apparatus for reproducing video data recorded by the apparatus shown in FIG. 10 or 11 will be described. From the magnetic tape 106 to the reproducing head 12
The signal reproduced at 0 is decoded into digital data by the recording / decoding unit 501. The decoded data is separated by a frame change flag separation unit 1101 into video data and a frame change flag. The separated video data is input to the error correcting unit 1103. Also, the separated frame change flag is determined by the frame change flag determination unit 1102.
It is determined whether the current playback frame is the same frame data as the previous frame.

The error concealment is an operation of interpolating video data lost due to a reproduction error with normal data. Generally, in a still image, since the previous frame and the current frame are the same data, error correction can be performed by replacing the missing video data with the video data at the same position in the previous frame. However, if the previous frame and the current frame are different images, such replacement between frames cannot be used. Therefore, interpolation may be performed from video data around the missing video data in the frame.

If the current playback frame is the same as the previous frame, the error correction unit 1103 replaces and replaces the data with the data of the previous frame. If the current playback frame is a frame different from the previous frame, the correction using the data of the previous frame is not performed, but the correction is performed by a method of interpolating from the video data around the missing video data in the frame.

The data subjected to the error correction processing in error correction section 1103 is decoded into a video signal in video decoding section 504 and output from video output section 506.

As described above, by performing the error correction using only the data of the frame composed of the same frame as the current frame using the frame change flag, the distortion due to the error correction can be greatly reduced. Also, when recording a still image, by always recording the same still image over a plurality of frames, the possibility of modification between the same still images increases. Of course, when it is difficult to modify the same still image with frame data, the modification can be performed using frame data for a different still image.

Further, in the embodiment of FIG. 12, the video signal is decoded after the error correction, but the error correction may be executed after the video signal is decoded.

Hereinafter, a ninth embodiment of the present invention will be described. FIG. 13 is a block diagram showing a ninth embodiment of the video signal processing device of the present invention. 13, reference numeral 106 denotes a magnetic tape, 130 denotes a reproducing head, 501 denotes a frame change flag separation unit, 1201 denotes a tape feed control unit, 110
2 is a frame change flag determination unit, 1202 is a memory, 5
04 is a video decoding unit, 506 is a video output unit, and 1203 is a still image changeover switch.

This apparatus reproduces video data recorded by the apparatus shown in FIG. 10 or FIG. A signal reproduced from the magnetic tape 106 by the reproducing head 120 is decoded into digital data by the recording / decoding unit 501. The decoded data is separated by a frame change flag separation unit 1101 into video data and a frame change flag. The separated video data is stored in the memory 1202
Is input to Also, the separated frame change flag is determined by the frame change flag determination unit 1102 as to whether or not the currently reproduced frame is data of the same frame as the previous frame.

Further, according to an instruction output from the still image changeover switch 1203 which is switched by the user, it is determined whether to continue the reproduction of the current still image or to reproduce the next still image. Here, when the reproduction of the current still image is continued, the data of the current frame stored in the memory 1202 is repeatedly output to the video decoding unit 504. When reproducing the next still image, the tape is controlled by the tape feed control unit 1201 to move the tape to a position where the data of the next still image can be reproduced. Whether the data of the next still image can be reproduced is determined by the frame change flag determination unit 11.
Judge at 02. That is, the point at which the current frame is determined to be different from the previous frame based on the determination result of the frame change flag determination unit 1102 is the first frame of the next still image. Therefore, the tape feed control unit 1201 controls the tape feed in accordance with the output of the still image changeover switch 1203 and the output of the frame change flag determination unit 1102.

The data of the next still image reproduced in this way is output to the video decoding unit 504 via the memory 1202. The video decoding unit 504 converts the input data to 1
The signal is decoded into a video signal for each frame and output to the video output unit 506.

As described above, in the embodiment shown in FIG. 13, frame advance of a still image can be performed using the frame change flag.
Further, the present embodiment can also cope with frame advance of a moving image, and the actual control can be applied other than the above method. It is also possible to set the memory behind the video decoding.

Hereinafter, ten embodiments of the present invention will be described. FIG. 14 shows a tenth embodiment of the video signal processing apparatus of the present invention.
FIG. 3 is a block diagram showing an embodiment. In FIG. 14, 1
06 is a magnetic tape, 130 is a reproducing head, 501 is a recording / decoding unit, 1301 is an interlace, still image flag separation unit, 1304 is a slow switch, 1302 is an interlace, still image flag determination unit, 504 is a video decoding unit, 1
Reference numeral 303 denotes an output method selection unit, and reference numeral 506 denotes a video output unit.

In the present apparatus, it is possible to simultaneously multiplex a plurality of types of flags as shown in FIG.
Here, a reproduction apparatus for data recorded by multiplexing an interlace flag and a still image flag simultaneously will be described. A signal reproduced from the magnetic tape 106 by the reproducing head 120 is decoded into digital data by the recording / decoding unit 501. The decoded data is separated into video data and an interlace flag and a still image flag by an interlace / still image flag separation unit 1301. The separated video data is decoded into a video signal for each field by a video decoding unit 504 and input to an output method selection unit 1303.

On the other hand, the interlace & still image flag determination unit 1302 determines whether or not the recorded video data is an interlace signal and a still image based on the interlace flag and the still image flag. At the same time, the slow switch 1304 selects and inputs normal playback, slow or still playback by the user.

If it is determined that the signal is an interlaced signal and a still image, the video signal is interlaced by the output method selection unit 1303 and output to the video output unit 506 during slow or still playback. Conversely, if it is determined that the video signal is a non-interlaced signal or a moving image, the video signal is deinterlaced by the output method selection unit 1303 and output to the video output unit 506 during slow or still playback. The output method selection unit 1303 has the configuration shown in FIG. 7, and the selector 602 may respond to the output of the interlace & still image flag determination unit 1302.

With this configuration, a still image in frame units (an interlaced signal and still image) can be automatically reproduced as a still image in frame units during slow or still playback. Therefore, higher definition image reproduction can be realized.

Although the present invention has been described with reference to the above embodiments, various methods can be applied to the present invention for video encoding, multiplexing, recording encoding, recording decoding, video decoding, and the like.
The present invention can be applied to recording on various recording media such as a magnetic disk, an optical disk, and a magneto-optical disk other than recording on a magnetic tape, and transmission via various transmission paths such as wireless and cable. Further, a configuration other than the above embodiment is possible, and a configuration combining the above embodiments is also possible. Some of the functional blocks shown in the embodiments can be realized by either hardware or software.

Further, with respect to actual implementation of the apparatus, it is possible to realize a cheaper apparatus by fixing the interlace flag so as to always select either interlace or non-interlace. Similarly, the still image flag and the frame change flag can always be set to fixed values. Further, the reproducing apparatus can also be configured to perform reproduction ignoring these flags.

[0085]

As is apparent from the above description, in the video signal processing method and the video signal processing device of the present invention, it is determined whether an input signal is an interlace signal or a non-interlace signal, and the information is determined. By transmitting the video signal and the video signal at the same time, it is possible to appropriately select whether to output the data in an interlace mode or a non-interlace mode on the reproducing side even when the video signal is transmitted or recorded on a home video game machine or the like. This makes it possible to prevent flicker on the screen.

When inputting a still image with a camera or the like,
In the case of a field-based still image in which a still image of one field is stored once in the memory and then transmitted or recorded over a plurality of field periods, a non-interlaced signal is selected to select a non-interlaced signal. Even when the still image is transmitted or recorded, it can be output in a non-interlaced manner, so that flicker can be prevented from occurring.

When transmitting or recording data obtained by performing field slow or still playback of the recorded video information again, by selecting a non-interlaced signal, the slow or still picture in field units is selected. Is transmitted or recorded, non-interlaced output is possible, so that flicker can be prevented.

Further, according to the present invention, it is possible to determine whether the frame is a moving image or a still image during reproduction by using the still image flag. Further, when recording a still image, data of the same frame is repeatedly recorded at least for at least n frames. Therefore, even if an error occurs at the time of reproduction, inter-frame modification can be performed.

Further, according to the present invention, since the change of a still image can be determined at the time of reproduction by using the frame change flag, frame advance for each still image can be easily realized. Further, since the range of the same frame can be detected by the frame change flag, even when performing inter-frame retouching between adjacent frames, the retouching can be performed in the same still image, so that image quality deterioration due to error retouching can be prevented.

Further, according to the present invention, by using the frame change flag, the reproducing side can determine whether the input data is the data of the normal reproduction or the data of the slow / still reproduction. Become.

Further, if various flags described above are used in combination, various recording and reproducing states can be expressed.

As described above, according to the present invention, since the recording state and the reproduction state can be determined by a simple method, the practical effect is very large.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram of a multiplexing unit according to the first embodiment.

FIG. 3 is a block diagram of an embodiment of an interlace flag setting unit 103;

FIG. 4 is a block diagram of a video signal processing apparatus according to a second embodiment of the present invention;

FIG. 5 is a block diagram of a video signal processing apparatus according to a third embodiment of the present invention;

FIG. 6 is a block diagram of a video signal processing apparatus according to a fourth embodiment of the present invention.

FIG. 7 is a block diagram of an embodiment of an output method selection unit 505;

FIG. 8 is a block diagram of a video signal processing apparatus according to a fifth embodiment of the present invention.

FIG. 9 is a block diagram of an embodiment of a still image flag setting unit 703.

FIG. 10 is a block diagram of a video signal processing apparatus according to a sixth embodiment of the present invention;

FIG. 11 is a block diagram of a video signal processing apparatus according to a seventh embodiment of the present invention;

FIG. 12 is a block diagram of an eighth embodiment of the video signal processing device of the present invention.

FIG. 13 is a block diagram of a ninth embodiment of the video signal processing device of the present invention.

FIG. 14 is a block diagram of a video signal processing apparatus according to a tenth embodiment of the present invention;

[Explanation of symbols]

 Reference Signs List 102 Video encoding unit 103 Interlace flag setting unit 104 Multiplexing unit 105 Recording encoding unit 302 Still image switch 401 Reproduction processing unit 402 Reproduction state output unit 501 Recording / decoding unit 502 Interlace flag separation unit 503 Interlace flag determination unit 504 Video decoding unit 505 Output method selection unit 701 Still image button 702 Memory 703 Still image flag setting unit 903 Frame change flag setting unit 1101 Frame change flag separation unit 1102 Frame change flag determination unit 1103 Error correction unit 1201 Tape feed control unit 1202 Memory 1203 Still image changeover switch 1301 Interlace, still image flag separation unit 1302 Interlace, still image flag determination unit 1304 Slow switch

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-111690 (JP, A) JP-A-4-111689 (JP, A) JP-A-6-225262 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H04N 5/91-5/956 G11B 20/10-20/12 H04N 5/782-5/783 H04N 7/00-7/015 H04N 7/24-7 / 68

Claims (18)

(57) [Claims] An interlace flag is set to a value indicating interlace when it is determined from input video type information that two fields in a frame are one piece of still image information per frame. and, when the two fields in the frame is determined to be composed of two same still picture information is set to a value indicating that the interlaced flag is non-interlaced, corresponding to the interlace flag A video signal processing method for transmitting or recording together with video information of a frame to be processed. 2. When reproducing the recorded video information and recording or transmitting it again, if the reproduction state is slow or still reproduction in field units according to the reproduction state input, the interlace flag is set to non-interlace. And transmitting or recording the interlace flag together with the video information of the corresponding frame. 3. When it is determined from input video type information that two fields in a frame are one piece of still image information per frame, an interlace flag is set to a value indicating interlace. and the interlace flag setting means for setting a value indicating a non-interlace the interlaced flag if the two fields in the frame is determined to be composed of two same still picture information, A video signal processing apparatus comprising: a multiplexing unit that multiplexes the interlace flag with video information of a corresponding frame; and a unit that transmits or records the multiplexed data. 4. When reproducing the recorded video information and re-recording or transmitting it, if the reproduction state is slow or still reproduction in field units according to the reproduction state input, the interlace flag must be non-interlaced. Interlace flag setting means for setting a value indicating the following, multiplexing means for multiplexing the interlace flag with video information of a corresponding frame, and means for transmitting or recording the multiplexed data. Characteristic video signal processing device. 5. An apparatus for receiving or reproducing data transmitted or recorded together with video information of a corresponding frame with an interlace flag indicating whether the signal is an interlace signal or a non-interlace signal for each frame of a video signal. Interlace flag decoding means for decoding whether the signal is an interlace signal or a non-interlace signal from the interlace flag, and if the signal is decoded as an interlace signal by the interlace flag decoding means, Interlaced output means for outputting so that the corresponding horizontal line of the other field is located between two adjacent horizontal lines on the screen of one field in the frame, and a non-interlace signal by the interlace flag decoding means And the corresponding horizontal field of the two fields in the frame The lines are output so as to be located at the same position on the screen, or are arranged so that the corresponding horizontal line of the other field is located between two adjacent horizontal lines on the screen of one field in the frame. And a non-interlaced output means for removing interference caused by interlacing by an inter-line filter and outputting the result. 6. A frame is formed for every two consecutive fields from a video signal inputted for each field, and
If it is determined from the video type information that is input separately from the video signal that the frame is stationary between two fields in the frame, a still image flag is set to a value indicating a still image, If it is determined that the image is moving between two fields in the frame, the still image flag is set to a value indicating that the image is a moving image, and the still image flag is transmitted or recorded together with the video information of the corresponding frame. A video signal processing method comprising: 7. The video signal processing method according to claim 6, wherein the value of the still image flag is set to the same value for at least n frames (where n is an integer of 2 or more). 8. The video signal processing method according to claim 7, wherein n is an integer of 3 or more. 9. Each frame of the input video signal movies the input
If it is determined from the video type information that is input separately from the image signal that the image is stationary between two fields in the frame, the still image flag is set to a value indicating a still image, A still image flag setting unit for setting the still image flag to a value indicating that the image is a moving image when determining that the image is moving between two fields; and multiplexing the still image flag with video information of a corresponding frame. A video signal processing apparatus, comprising: a multiplexing unit for transmitting the multiplexed data; and a unit for transmitting or recording the multiplexed data. 10. The still image flag setting means sets the value of the still image flag to the same value over at least n frames (where n is an integer of 2 or more). The video signal processing device according to the above. 11. The video signal processing device according to claim 10, wherein n is an integer of 3 or more. 12. When transmitting or recording a still image video signal, one frame of a still image is repeatedly encoded for a period of n consecutive frames (where n is an integer of 2 or more) for each frame unit, and The value of the frame change flag for the first frame of the frame period is set to a value indicating that the current frame and the previous frame are different still images, and the value of the frame change flag for the second and subsequent frames of the n frame period is set. Is set to a value indicating that the current frame and the previous frame are the same still image,
A video signal processing method, wherein the frame change flag is transmitted or recorded together with the video information of the corresponding frame. 13. When the recorded video information is reproduced and recorded or transmitted again, when the reproduction state is slow or still reproduction according to the reproduction state input and the same frame is repeatedly reproduced n times continuously. Setting the value of the frame change flag for the first frame of the n-th frame to a value indicating that the current frame and the previous frame are data of different frames, and setting the frame change flag for the second and subsequent frames of the n-th frame. A video signal processing method, wherein a value of a change flag is set to a value indicating that a current frame and a previous frame are data of the same frame. 14. An apparatus for transmitting or recording a still picture video signal, comprising: n frames (where n
Is an integer of 2 or more) periods or more, and each frame is encoded, and the value of the frame change flag for the first frame of the n-frame period is set to a value indicating that the current frame and the previous frame are different still images. Frame change flag setting means for setting the value of the frame change flag for frames subsequent to the second frame in the n-frame period to a value indicating that the current frame and the previous frame are the same still image; A video signal processing apparatus comprising: a multiplexing unit that multiplexes the multiplexed data into video information of a corresponding frame; and a unit that transmits or records the multiplexed data. 15. When playing back recorded video information and recording or transmitting the same again, the playback state is slow or still playback according to the playback state input, and the same frame is repeatedly played back n times continuously. Setting the value of the frame change flag for the first frame of the n frames to a value indicating that the current frame and the previous frame are data of different frames, and setting the frame change flag for the second and subsequent frames of the n frame Frame change flag setting means for setting the value of the current frame and the previous frame to a value indicating that the data is the same frame, multiplexing means for multiplexing the frame change flag to the video information of the corresponding frame, Means for transmitting or recording the multiplexed data. 16. When transmitting or recording a video signal of a certain frame repeatedly n times in a continuous n frame period,
An apparatus for reproducing data transmitted or recorded simultaneously with a frame change flag indicating whether or not the current frame is data of the same frame as the immediately preceding frame. A frame change flag determining means for determining, using the frame change flag, an adjacent frame that is data of the same frame as the data of the current frame when replacing and modifying the data with data of an adjacent frame; A video signal processing apparatus, comprising: a correction unit for performing error correction using data of a frame determined to be the same frame as a current frame by a change flag determination unit. 17. When a video signal of a certain frame is repeatedly transmitted or recorded n times in a continuous manner for n frame periods, a frame change flag indicating whether or not the current frame is data of the same frame as the immediately preceding frame. An apparatus for reproducing data transmitted or recorded by an apparatus for simultaneously transmitting or recording, the apparatus comprising: a frame change flag for decoding the frame change flag to determine whether the immediately preceding frame and the current frame are different frame data. A determining means for determining whether the immediately preceding frame and the current frame are the same frame by the frame change flag determining means when the still image currently being reproduced is continuously reproduced according to the still image selection input during the still reproduction. Output the data of the selected frame and play back the still image after the still image currently being played, Video signal processing apparatus comprising: frame output means for outputting data of frames subsequent to the frame indicating that the current frame is different from the immediately preceding frame by the frame change flag determination means. . 18. An interlace flag indicating whether an interlace signal or a non-interlace signal is provided for each frame of a video signal, and a still image flag indicating whether a still image exists between the two fields. An apparatus for performing slow or still playback of data transmitted or recorded together with video information of a frame, comprising: a flag decoding means for decoding the interlace flag and the still picture flag; Means for reproducing a still image in frame units when the signal is decoded as a race signal and a still image.