JP2882161B2 - Video signal recording / reproducing device, video signal transmitting device, video signal encoding device, and video signal 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 signal used for efficiently encoding and decoding a video signal from a multi-laser player or the like, or for transmitting a video signal with high efficiency in digital broadcasting or the like. The present invention relates to a compression / expansion device.

[0002]

2. Description of the Related Art In recent years, in the field of digital signal processing of video disks and the like and the field of digital broadcasting, it has been attempted to reduce the size of video software and devices by compressing video signals with high efficiency. The method will be described with reference to the drawings. FIGS. 4A and 4B are block diagrams showing the configuration of an embodiment of a conventional video signal compression / decompression device. MPEG (Moving Pictu
re ExpertsGroup) 1 or the like, conventional 2: 1 interlaced video software is thinned out in both horizontal and vertical directions, and then inter-frame prediction, motion compensation, orthogonal transform (DCT transform, etc.)
By performing non-linear quantization, variable-length coding, and the like, high-efficiency band compression is to be realized (this is, for example, Nikkei Electronics 1990.10.15 (n
o. 511) on pages 115-142).

[0003] The band-compressed video signal is once recorded on a recording medium 42 such as a magneto-optical disk or transmitted through a transmission means 45.

The reproduced video signal from the recording medium 42 or the video signal transmitted by the transmission means 45
Alternatively, it is expanded and output by 46.

[0005]

However, the conventional band compression method has the following problems. Originally, 24Hz
An image recorded on a film such as a movie, which is expressed at a frame rate, is converted to 29.97, for example, according to the NTSC system.
For video program is converted into 2-one interlaced video signals Hz frame rate and outputs, deflection
To perform field-to-field processing on fields that contain exactly the same temporal information inserted to change the frame rate , and use exactly the same bandwidth compression for fields created by interpolation from a certain field. This is done twice, which means that there is a part that is not efficient.

[0006]

In order to solve the above-mentioned problems, a video signal recording / reproducing apparatus and a video signal transmission apparatus according to the present invention comprise a compression means for band-compressing an input video signal, and a video signal recording apparatus. A video signal in which one created frame is made to correspond to one frame is defined as a first video signal, and has a 2: 1 ratio.
When the interlaced video signal is a second video signal, a determination unit that determines whether the input video signal is a first video signal or a second video signal, and a video band-compressed by the compression unit A recording medium for separately recording the signal and the discrimination signal created by the discrimination means, or a synthesizing circuit for synthesizing the video signal and the discrimination signal; and a transmission means for transmitting an output from the synthesizing circuit; Or expansion means for expanding the video signal transmitted by the transmission means and separated by the separation circuit, and interpolation for converting the video signal obtained by compressing and expanding the first video signal into the second video signal by field interpolation If the video signal output from the decompression means is a video signal obtained by compressing and expanding the first video signal, the interpolation circuit performs interpolation processing. If the video signal is a video signal obtained by compressing and expanding the second video signal, the video signal is recorded on the recording medium so as to be output without passing through an interpolation circuit, or is transmitted by the transmission means and transmitted by the separation circuit. The interpolation circuit is controlled by a control circuit in accordance with the separated determination signal.

[0007]

According to the present invention, in addition to the conventional band compression and expansion processing of a 2-to-1 interlace video signal,
One frame created from images recorded on film is one
For a video signal source corresponding to a frame, information similar to the conventional one can be obtained only by processing images of the number of frames per second (for example, 24 images per second) . Further, in the process of band compression and expansion, the inter-field processing can be omitted for a video signal source in which one frame created from an image recorded on a film corresponds to one frame.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a video signal recording / reproducing apparatus according to the present invention will be described below with reference to the drawings. In addition, say
Not long ago, video signal recording and playback devices
It consists of a device and a video signal reproducing device.

FIG. 1 is a block diagram showing the configuration of an embodiment of a video signal recording / reproducing apparatus according to the present invention. The input video signal is input to the compression means 1. The configuration of the compression means 1 is as shown in FIG. 3, in which a video signal corresponding to one frame of one frame created from an image recorded on a film is defined as a first video signal, Higher frame
The 2: 1 interlaced video signal having a Mureto second
Determining means 2 for determining whether the input video signal is the first video signal or the second video signal
The input video signal is converted into the first video signal using the discrimination signal output from
In the case of the video signal, the prediction circuit 32 performs inter-frame prediction and motion compensation, and outputs the signal to the control circuit 33.
At 1, the control circuit 33 controls and outputs the band compression processing using only the inter-frame processing using the discrimination signal. If the input video signal is the second video signal, band compression is performed using inter-frame processing and inter-field processing and output.
The video signal output from the compression means 1 and the discrimination signal output from the discrimination means 2 are temporarily recorded on the recording medium 3. The reproduced video signal output from the recording medium 3 is input to the decompression means 4, and is subjected to frame decomposition according to the number of frames per second of the input video signal according to the reproduction discrimination signal from the recording medium 3 input at the same time. Output after performing. The output from the expansion means 4 is output to the switch circuit 6 controlled by the control circuit 5 using the discrimination signal. If the output video signal is a video signal obtained by compressing and expanding the first video signal, the switch circuit 6 outputs the video signal to the interpolation circuit 7,
If the video signal is a video signal obtained by performing compression / expansion processing, the video signal is output to the switch circuit 8 as it is. The interpolation circuit 7 is a decompression circuit 4
A video signal obtained by subjecting the first video signal output from the first video signal to compression / expansion processing is converted from the first video signal by field interpolation processing .
The signal is converted into a second video signal having a high frame rate and output to the switch circuit 8. The switch circuit 8 is controlled by the control circuit 5 so as to output the signal output from the switch circuit 6.

Next, an embodiment of a video signal transmission apparatus according to the present invention will be described with reference to the drawings. In addition,
Instead, the video signal transmission device must be compatible with the video signal encoding device.
And a video signal reproducing device.

FIG. 2 is a block diagram showing the configuration of an embodiment of a video signal transmission device according to the present invention. The signal flow of the part related to the compression / decompression is basically the same as that of the video signal recording / reproducing apparatus, but has the following features.
As in the embodiment of the video signal recording / reproducing apparatus, the video signal created from the input video signal and the discrimination signal are synthesized by the synthesizing circuit 21 and transmitted simultaneously by the transmission means 22. The transmitted signal is again separated into a video signal and a discrimination signal by the separation circuit 23, and thereafter, is subjected to the same processing as that of the video signal recording and reproducing apparatus.

The above is the signal flow of the present invention. As a structural feature of the present invention, an input video signal source discriminating means 2 is provided on the recording side, and an interpolation circuit 7 for converting the first video signal into the second video signal is provided on the reproduction side, and an interpolation circuit based on the discrimination signal. The control circuit 5 for controlling the output to the control circuit 7 is incorporated.

[0013]

As described above, the video signal recording / reproducing apparatus and the video signal transmission apparatus according to the present invention are the same as those of the conventional two-to-one.
In addition to performing band compression and decompression processing on the interlaced video signal, one frame created from the image recorded on the film is transferred to the video signal source corresponding to one frame by the number of frames corresponding to the frame. A result similar to that of the related art can be obtained only by performing the processing, and the inter-field processing can be omitted in the course of the compression / decompression processing.

Further, the video signal recording / reproducing apparatus records the discrimination signal in an area different from the video signal on the recording medium, so that the entire processing method can be determined only by first reading the discrimination signal. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a video signal recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a video signal transmission / reproduction device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing an internal configuration of a compression unit 1 in FIGS. 1 and 2;

FIG. 4 is a block diagram showing a configuration of a conventional video signal compression recording / expansion / reproduction apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compression means 2 Discrimination means 3 Recording medium 4 Decompression means 5, 34 Control circuit 9 Interpolation circuit 21 Synthesis circuit 22 Transmission means 23 Separation circuit 31 Compression coding means

Continuation of the front page (56) References JP-A-59-61380 (JP, A) JP-A-1-18686 (JP, A) JP-A-58-189802 (JP, A) JP-A-2-114784 (JP) , A) JP-A-63-204987 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04N 7/24-7/68 H04N 5/91-5/956

Claims (7)

(57) [Claims] 1. A compression means for band-compressing an input video signal, and one frame created from an image recorded on a film is
A video signal corresponding to a frame is defined as a first video signal,
When a 2: 1 interlaced video signal having a higher frame rate than the first video signal is used as the second video signal, it is determined whether the input video signal is the first video signal or the second video signal. Discriminating means for discriminating, a recording medium for recording the video signal band-compressed by the compression means and the discrimination signal created by the discriminating means, and expanding the band-compressed video signal recorded on the recording medium and expanding means, a video signal compression and expansion process the first video signal Fi
An interpolation circuit for converting the first video signal into a second video signal by means of a field interpolation; if the video signal expanded by the expansion means is obtained by compressing and expanding the first video signal, the video signal is interpolated by the interpolation circuit; If the video signal decompressed by the decompression means is obtained by compressing and decompressing the second video signal, the video signal is output from the recording medium such that it passes through an interpolation circuit without processing. And a control circuit for controlling the interpolation circuit based on the discrimination signal. 2. A compression encoding means for switching between inter-frame processing and inter-field processing for an input video signal in accordance with motion and performing compression processing, and performing motion compensation and inter-frame prediction from the input video signal. 2. The video according to claim 1, further comprising: a control circuit that controls the compression encoding unit so as not to perform inter-field processing when the input video signal is the first video signal using the determination signal. Signal recording / reproducing device. 3. A compression means for band-compressing an input video signal, and one frame created from an image recorded on a film is used as one frame.
A video signal corresponding to a frame is defined as a first video signal,
2 having a higher frame rate than the first video signal
When the one-to-one interlace video signal is a second video signal, a determination unit that determines whether the input video signal is a first video signal or a second video signal; A combining circuit that combines the video signal and the determination signal created by the determination unit; a transmission unit that transmits an output from the synthesis circuit; and a signal that is transmitted by the transmission unit into a video signal and a determination signal. a separating circuit for separating and expanding means for expanding a video signal band-compressed separated by the separation circuit, a video signal compression and expansion process the first video signal Fi
An interpolation circuit for converting the first video signal into a second video signal by means of a field interpolation; if the video signal expanded by the expansion means is obtained by compressing and expanding the first video signal, the video signal is interpolated by the interpolation circuit; If the video signal expanded by the expansion means is obtained by compressing and expanding the second video signal, the video signal is output from the separation circuit so as to be output without passing through an interpolation circuit. And a control circuit for controlling the interpolation circuit based on the discrimination signal. 4. A compression means for switching between inter-frame processing and inter-field processing for an input video signal in accordance with motion and performing compression processing, and performing motion compensation and inter-frame prediction from the input video signal. 4. The video according to claim 3, further comprising: a control circuit that controls the compression encoding unit so as not to perform inter-field processing when the input video signal is the first video signal using the determination signal. Signal transmission device. 5. An image created from an image recorded on a film.
A video signal in which one frame corresponding to one frame is
A video signal, and a higher frame rate than the first video signal.
A 2: 1 interlaced video signal with a
If the input video signal is an image signal, the input video signal is the first video signal.
Or the second video signal, and indicates the result.
Discriminating means for creating a discriminating signal, inter-frame processing according to the motion with respect to the input video signal,
Compression encoding that switches between fields and performs compression
Means for performing motion compensation and inter-frame prediction from the input video signal.
The input video signal is converted to the first video signal using the discrimination signal.
No line the inter-field process in the case of the video signal
And a control circuit for controlling the compression encoding means.
Video signal encoding device. 6. A compressed band recorded on a recording medium.
Read out video signal and discrimination signal indicating type of video signal
Reading means, and a band-compressed image read from the reading means
A decompression means for decompressing a signal, and one frame generated from an image recorded on the film as one frame.
A video signal corresponding to a frame is defined as a first video signal,
Two pairs having a higher frame rate than the first video signal
When one interlace video signal is used as the second video signal
In this case, the video signal obtained by compressing and expanding the first video signal is
Complementary conversion to the second video signal by field interpolation
And a video signal decompressed by the decompression means and the first video signal.
If the image signal has been compressed and expanded, the video signal
The interpolation circuit performs an interpolation process and outputs the result,
The video signal expanded by the stage compresses the second video signal.
If the data has been reduced and expanded, it is passed through the interpolation circuit without processing.
The interpolation circuit is controlled by the determination signal so that the
And a control circuit for controlling the video signal. 7. A video signal transmitted after being subjected to band compression.
Receiving means for receiving the determination signal indicating the type of the video signal
When, Discriminates the signal received by the receiving means as a video signal
A separation circuit for separating the signal from the signal; The band-compressed video signal separated by the separation circuit
Extension means for extending the signal, One frame created from the image recorded on the film
A video signal corresponding to a frame is defined as a first video signal,
Two pairs having a higher frame rate than the first video signal
When one interlace video signal is used as the second video signal
In this case, the video signal obtained by compressing and expanding the first video signal is
Complementary conversion to the second video signal by field interpolation
Inter-circuit and The video signal decompressed by the decompression means is supplied to the first video signal.
If the image signal has been compressed and expanded, the video signal
The interpolation circuit performs an interpolation process and outputs the result. Note
The video signal expanded by the stage compresses the second video signal.
If the data has been reduced and expanded, it is passed through the interpolation circuit without processing.
The interpolation circuit is controlled by the determination signal so that the
And a control circuit for controlling the video signal.