JP2003078876A - Method and apparatus for recording video signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record a video signal with standard/high definition with highly efficient in-frame compression. SOLUTION: A television signal from an input terminal 1 is fed to a luminance/chrominance separation and chrominance decode circuit 2, an analog/ digital converter circuit 3 converts a separated luminance signal and two separated color difference signals into a digital video signal, and the digital video signal is fed to a video signal processing circuit 6 having a wavelet conversion circuit 4 and an entropy coding circuit 5. Then a compressed video signal compressed by the video signal processing circuit 6 is fed to an error correction and signal forming circuit 7, where an error correction code is generated in cooperation with e.g. a 16 M memory 8 and the code is attached to the compressed video signal. Then an audio signal fed to e.g. an input terminal 9 is applied to the error correction and signal forming circuit 7 through an analog/ digital converter circuit 10 and an audio signal processing circuit 11. The error correction and signal forming circuit 7 mixes the processed audio signal to the video signal with the error correction signal attached thereto in time division and the mixed signal is fed to a video head (not shown) through an RF block 12 acting like a recording means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal recording method and apparatus suitable for use in recording video signals such as standard television signals and high definition television signals.
For more information, see Joint Photographic E
The image signal is recorded on a recording medium by using an image compression technique based on xperts group (hereinafter abbreviated as JPEG).

[0002]

2. Description of the Related Art For example, a video tape recorder (hereinafter abbreviated as VTR) of a digital video (hereinafter abbreviated as DV) system used as a means for recording a television signal has a low compression efficiency. In addition, it is limited to record a standard television signal of NTSC system or PAL system at a recording rate of 25 Mbps, for example. Alternatively, when the recording rate of 12.5 Mbps is used, the base band becomes 3: 1: 0 and the resolution becomes insufficient.

On the other hand, in a recorder using a so-called digital versatile disc (hereinafter, abbreviated as DVD), a Moving Picture Expert is used.
2. Description of the Related Art Video signals are recorded on a recording medium by using an image compression technique based on the sGroup-2 (hereinafter abbreviated as MPEG-2) system. According to the image compression technique based on the MPEG-2 system, high compression efficiency can be obtained, and thus recording can be performed for a longer time with sufficient resolution.

However, in the image compression technique based on the MPEG-2 system, for example, since compression is performed using the correlation between frames as shown in FIG. 2B, it is not easy to edit in frame units, for example. . Further, when variable speed reproduction is performed, the reproduction speed is determined by the number of frames used for the correlation during compression, and therefore a desired reproduction speed cannot be arbitrarily selected. Further, since compression is performed using a plurality of frames, the configuration of the compression circuit becomes huge, which causes an increase in the price of the device.

Further, in the image compression technique based on the MPEG-2 system, since the output signal taken out at the time of reproduction is in the transport stream (hereinafter abbreviated as TS) format, connection with various applications is complicated, Development of software etc. becomes complicated. Further, since audio and video are mixed, after recording and insert recording cannot be performed. Also, audio is MPEG
-1 There was a problem that compression was performed by Layer 2.

Further, when recording a high-definition television signal, for example, although the standard is set in the DV system, the recording time is halved because the recording is performed at a recording rate of 50 Mbps, for example. . On the other hand, M
Recording using the PEG-2 system has also been proposed, but it is difficult to edit as described above, and variable speed reproduction and insert recording cannot be performed.
The function realized in R cannot be executed.

[0007]

This application has been made in view of the above-mentioned problems, and the problem to be solved is that the conventional apparatus has a low compression efficiency and therefore a short recording time. Or the resolution becomes insufficient. Alternatively, when the image compression technique based on the MPEG-2 system is used, editing becomes difficult and functions such as variable speed reproduction cannot be performed. Further, in recording a high definition television signal, good recording could not be performed because the recording time was further shortened.

[0008]

Therefore, in the present invention, the video signal is intraframe-compressed by using the wavelet transform and entropy coding, and the compressed signal is recorded on the recording medium at a fixed rate. According to this, the compression efficiency is high, and functions such as editing, variable speed reproduction, and insert recording can be easily executed, and further, recording of high-definition television signals can be performed well. it can.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the video signal recording method of the present invention, a video signal is intraframe-compressed by using wavelet transform and entropy coding, and the compressed signal is recorded on a recording medium at a fixed rate. It will be.

Further, in the video signal recording apparatus of the present invention, the compression means for compressing the video signal in the frame by using the wavelet transform and the entropy coding, and the compressed signal are recorded on the recording medium at a fixed rate. And a recording means.

The present invention will be described below with reference to the drawings. In FIG. 1, a standard television signal is recorded on a tape-shaped recording medium by applying the video signal recording method and apparatus according to the present invention. Disclosed is a block diagram showing the configuration of an embodiment in the case of forming a recording apparatus for.

In FIG. 1, for example, a standard television signal SD is supplied to the input terminal 1. The standard television signal SD from the input terminal 1 is supplied to the luminance / chroma separation / chroma decoding circuit 2 to separate the luminance signal and the two color difference signals. Further, the luminance signal and the two-color difference signal are supplied to the A / D conversion circuit 3, and, for example, the base band is 4: 1: 1, or 4: 2: 0, or 4 :.
It is converted into a digital video signal of 1: 0.

These digital video signals are supplied to a video signal processing circuit 6 having a wavelet transform circuit 4 and an entropy coding circuit 5. These circuits perform intraframe compression for each frame of the supplied digital video signal to form a compressed digital video signal. Here, the video signal processing circuit 6 based on wavelet transform and entropy coding is, for example, J
It is defined as PEG-2000.

The compressed video signal compressed by the video signal processing circuit 6 is supplied to the error correction and signal forming circuit 7.
In this circuit 7, for example, an error correction code is generated in cooperation with the 16M memory 8 and added. At the same time, for example, the audio signal supplied to the input terminal 9 is converted into a digital signal by the A / D conversion circuit 10. The digital audio signal is sent to the circuit 7 through the audio signal processing circuit 11.
And is mixed in time division with the above-mentioned video signal to which the error correction code is added.

Further, the signal from the error correction and signal forming circuit 7 is supplied to a video head (not shown) through an RF block 12 serving as a recording means and recorded on a tape-shaped recording medium (not shown), for example. It Further, the signal from the error correction and signal forming circuit 7 is supplied to the LINK / PHY circuit 13 serving as the interface means, and the IE
It is output to a digital video signal transmission means (not shown) defined by EE1394 or the like.

In this apparatus, the video signal processing circuit 6 performs compression according to JPEG-2000, for example. Here, in this JPEG-2000, it is possible to perform lossless lossless compression of, for example, a standard television signal SD to a fixed rate of 25 Mbps by performing wavelet transform and entropy coding. Further, since JPEG-2000 is originally a compression unit for still images, in this case, compression within a frame is also performed.

That is, in this apparatus, the standard television signal SD supplied to the input terminal 1 is compressed for each frame by, for example, JPEG-2000. Then, an error correction code and an uncompressed audio signal are added to this compressed video signal, and these signals are recorded on a recording medium at a fixed rate. As a result, the standard television signal SD
For example, it is recorded on the recording medium as a series of still images JP-2 for each frame as shown in A of FIG.

Further in this case, for example, the above-mentioned JPEG
By using -2000, the standard television signal SD is set to 25 Mbps by setting the base band to 4: 1: 1, 4: 2: 0, or 4: 1: 0.
It can be compressed to a fixed rate. This bit rate is equal to the recording rate of the current DV system VTR, and this compressed signal can be recorded in the standard mode of the DV system VTR as shown in A of FIG. 3, for example. is there.

Alternatively, in the application which does not require reversible compression, for example, the standard television signal SD is set to 12.5M by setting the baseband to 4: 2: 0 or 4: 1: 1.
It is also possible to compress to a fixed rate of bps. In this case, this compressed signal can be recorded in the long-time mode of the DV VTR as shown in FIG. 3B, for example. And in this case, the current DV VT
The baseband performed in R long time mode is 3: 1: 0
It is possible to obtain a higher image quality than the recording of.

Therefore, in this embodiment, for example, the standard television signal SD can be recorded by lossless lossless compression. Note that the current compression by the DV method is not lossless compression. Or if you don't need lossless compression,
For example, standard television signal SD, baseband 4:
It is also possible to compress to a fixed rate of 12.5 Mbps with 2: 0 or 4: 1: 1. In this case, it is possible to obtain higher image quality than the current one in the long time mode.

That is, in the above-described embodiment, in the standard mode of the current DV system VTR, recording is performed in a pattern in which one frame is made into 10 tracks on the tape as shown in A of FIG. 3, for example. . In each of these tracks, an area for video signal data is provided at the center, an area for subcode is provided at one end, and an ITI area for recording control information and audio signals is provided at the other end. A data area is provided.

Therefore, in this recording pattern, the bit rate of the video signal data area is [the number of provided sync blocks × 77 bytes × the number of tracks × frames × correction value]. Specifically, 135 × 77 × 8 × 10 × 3
It is 0 × 1000/10001 = 24.923 Mbps.

Therefore, the above-mentioned standard television signal SD is
For example, by compressing to a fixed rate of 25 Mbps, it can be recorded in the video signal data area of the above-mentioned current DV system VTR. In this case, for example, by using JPEG-2000, the base band is 4: 1: 1 or 4: 2: 0, or 4: 4.
When it is set to 1: 0, lossless lossless compression becomes possible. In this case, the audio signal is recorded uncompressed.

Further, in the long-time mode of the current DV system VTR, recording is performed in a pattern in which one frame is made up of five tracks as shown in FIG. 3B, for example. In this recording pattern, the bit rate of the video signal data area is specifically 135 × 77 × 8 × 5 × 30 ×
It becomes 1000/1001 = 1.46153 Mbps.

Therefore, the above-mentioned standard television signal SD is
For example, by compressing at a fixed rate of 12.5 Mbps, it is possible to record in the video signal data area in the long-time mode of the current DV system VTR. Then, in this case, by using, for example, JPEG-2000, the base band is 4: 1: 1 or 4: 2: 0.
As a result, it is possible to record with the image quality of the standard mode of the current DV system VTR. In this case, the audio signal is recorded uncompressed.

Further, for example, by using JPEG-2000, it is possible to compress the standard television signal SD to a fixed rate of 6.23 Mbps with the base band being 4: 1: 0. In this case, the current D
It is possible to record for a long time which is twice as long as that of the V mode VTR for a long time. Therefore, although the image quality in this case is slightly deteriorated as compared with the current DV system, it is superior to the image quality of the conventional analog VTR, for example. Also in this case, the audio signal is recorded uncompressed.

By the way, when such recording is performed by the current DV type VTR, it is possible to perform recording with a pattern in which two frames are five tracks as shown in C of FIG. 3, for example. Here, for example, 180 as shown in FIG.
In a device that uses two heads that are opposite each other and have different azimuth angles, the current long-time mode recording is as shown in FIG.
Recording is continuously performed as indicated by A, and in the above-described recording using two frames as five tracks, recording is performed with a break as shown in B of FIG.

Further, for such recording, for example, as shown in FIG. 6, a data buffer 14 is provided between the RF block 12 and the compression system up to the above-mentioned error correction and signal forming circuit 7, and the above-mentioned break is provided. During the period, data is buffered in the data buffer 14, and the buffered data is sent during the recording period to perform recording. According to this, it is possible to realize the recording using the above-mentioned two frames as five tracks without changing the configuration or mechanism of the RF block 12, the head, or the like.

FIG. 7 shows an embodiment in which a recording apparatus for recording a standard television signal on a disk-shaped recording medium is formed by applying the video signal recording method and apparatus according to the present invention. A block diagram showing the configuration is disclosed. In the following description, parts corresponding to those in the embodiment shown in FIG.

In FIG. 7, for example, a standard television signal SD is supplied to the input terminal 1. The standard television signal SD from the input terminal 1 is supplied to the luminance / chroma separation / chroma decoding circuit 2 to separate the luminance signal and the two-color difference signal. Further, these signals are supplied to the A / D conversion circuit 3 and converted into a digital video signal having a base band of 4: 1: 1, 4: 2: 0, or 4: 1: 0, for example.

These digital video signals are supplied to a video signal processing circuit 6 having a wavelet transform circuit 4 and an entropy coding circuit 5. These circuits perform intraframe compression for each frame of the supplied digital video signal to form a compressed digital video signal. Here, the video signal processing circuit 6 based on wavelet transform and entropy coding is, for example, J
It is defined as PEG-2000.

The compressed video signal compressed by the video signal processing circuit 6 is supplied to the error correction and signal forming circuit 7.
In this circuit 7, for example, an error correction code is generated in cooperation with the 16M memory 8 and added. At the same time, for example, the audio signal supplied to the input terminal 9 is converted into a digital signal by the A / D conversion circuit 10. The digital audio signal is sent to the circuit 7 through the audio signal processing circuit 11.
And is mixed in time division with the above-mentioned video signal to which the error correction code is added.

Further, the signal from the error correction and signal forming circuit 7 serves as an interface means, LINK / PHY.
It is supplied to the circuit 13 and output to a video signal transmission means (not shown) defined by IEEE 1394 or the like. At the same time, the signal from the error correction and signal forming circuit 7 is transmitted to the PCI.
It is supplied to the bridge 15 and the PCI bridge 15
It is converted to TAPI or SCSI format and supplied to the optical disc recording device 16 such as a DVD.

In this apparatus, the video signal processing circuit 6 performs compression according to JPEG-2000, for example. Here, in this JPEG-2000, for example, the standard television signal SD can be compressed at an arbitrary rate by performing wavelet transform and entropy coding. In addition, JPEG-2
Since 000 is originally a still image compression means, in this case, compression within a frame is also performed.

That is, in this apparatus, the standard television signal SD supplied to the input terminal 1 is compressed for each frame by, for example, JPEG-2000. Then, an error correction code and an uncompressed audio signal are added to this compressed video signal, and these signals are recorded on a recording medium at a fixed rate. As a result, the standard television signal SD
For example, it is recorded on the recording medium as a series of still images JP-2 for each frame as shown in A of FIG.

Further, in this case, for example, the above-mentioned JPEG
By using -2000, the standard television signal SD can be compressed to any fixed rate. And video signals compressed at any of these fixed rates,
It can be supplied to an optical disk recording device 16 such as a DVD and recorded on a disk-shaped recording medium. The relationship between the rate of the compressed signal and the image quality is, for example, as shown in [Table 1] below.

[0037]

[Table 1]

Further, in this apparatus, since the compression is performed within the frame, each frame can be arbitrarily extracted. According to this, the compressed video signal is expanded for each frame, so that it is possible to perform editing on a frame-by-frame basis, and at the same time, perform variable-speed reproduction by extracting frames at arbitrary intervals. It is possible to easily realize a function such as insert recording in units of one frame.

Therefore, in this embodiment, it is possible to easily perform the editing, the variable speed reproduction, the insert recording, etc. of the recorded standard television signal SD. It should be noted that the above-mentioned editing is difficult in MPEG-2 used in the recorder using the current DVD, and variable speed reproduction, insert recording, etc. are limited. In addition, compression can be performed at an arbitrary rate, and recording can be performed according to a request for image quality or the like. Furthermore, the recording of the audio signal can be performed without compression.

Further, FIG. 8 shows an embodiment of forming a recording device for recording a high-definition television signal on a tape-shaped recording medium by applying the video signal recording method and device according to the present invention. Disclosed is a block diagram showing the configuration of the form. Note that FIG. 8 shows a case where the present invention is applied to a camera-integrated recording device. Further, in the following description, the same reference numerals are given to the portions corresponding to the above-described embodiment of FIG.

In FIG. 8, for example, 1440 × 1
Camera device 2 for capturing 080i interlaced images
0 is provided. Then, the high-definition television signal HD from the camera device 20 is transferred to the video buffering device 2
1 to supply a digital video signal having a base band of 4: 2: 0, for example. The digital video signal from the video buffering device 21 is supplied to the video signal processing circuit 6 having the wavelet transform circuit 4 and the entropy coding circuit 5.

Here, the video signal processing circuit 6 by wavelet transform and entropy coding is, for example, JPEG.
It is defined as -2000, and the intra-frame compression is performed for each frame of the supplied digital video signal to form a compressed digital video signal.
The compressed video signal compressed by the video signal processing circuit 6 is supplied to the error correction and signal forming circuit 7. Then, in the circuit 7, for example, an error correction code is generated in cooperation with the 16M memory 8 and added.

Further, for example, a voice signal from the microphone 22 which picks up voice is taken out through the microphone amplifier 23. This audio signal is converted into a digital signal by the A / D conversion circuit 10. This digital audio signal is supplied to the above-mentioned error correction and signal formation circuit 7 through the audio signal processing circuit 11 and is mixed in time division with the video signal to which the error correction code is added.

Further, the signal from the error correction and signal forming circuit 7 is supplied to a video head (not shown) through an RF block 12 serving as a recording means and recorded on, for example, a tape-shaped recording medium (not shown). It Further, the signal from the error correction and signal forming circuit 7 is a LINK / P serving as interface means through the QT file circuit 24.
It is supplied to the HY circuit 13 and output to a video signal transmission means (not shown) defined by IEEE 1394 or the like.

Alternatively, FIG. 9 shows another example of forming a recording device for recording a high definition television signal on a tape-shaped recording medium by applying the video signal recording method and device according to the present invention. A block diagram showing the configuration of the embodiment is disclosed. Note that FIG. 9 shows a case where the present invention is applied to a so-called deck type recording device. Further, in the following description, the same reference numerals are given to the portions corresponding to the above-described embodiment of FIG.

In FIG. 9, for example, the input terminal 25
The high-definition television signal HD supplied to the A / D converter circuit 26 has a clock frequency of 74.25 MHz, for example.
Through, for example, the clock frequency is 55.6875MH
z video buffering device 27. Then, in this video buffering device 27, a horizontal resolution is converted from 1920H to 1440H, and a digital video signal having a base band of 4: 2: 0 is formed.

These digital video signals are supplied to the video signal processing circuit 6 having the wavelet transform circuit 4 and the entropy coding circuit 5. These circuits perform intraframe compression for each frame of the supplied digital video signal to form a compressed digital video signal. Here, the video signal processing circuit 6 based on wavelet transform and entropy coding is, for example, J
It is defined as PEG-2000.

The compressed video signal compressed by the video signal processing circuit 6 is supplied to the error correction and signal forming circuit 7.
In this circuit 7, for example, an error correction code is generated in cooperation with the 16M memory 8 and added. At the same time, for example, the audio signal supplied to the input terminal 9 is converted into a digital signal by the A / D conversion circuit 10. The digital audio signal is sent to the circuit 7 through the audio signal processing circuit 11.
And is mixed in time division with the above-mentioned video signal to which the error correction code is added.

Further, the signal from the error correction and signal forming circuit 7 is supplied to a video head (not shown) through an RF block 12 serving as a recording means and recorded on, for example, a tape-shaped recording medium (not shown). It The signal from the error correction and signal forming circuit 7 is sent to the QT file circuit 2
LINK / PH as interface means through 4
It is supplied to the Y circuit 13 and output to a video signal transmission means (not shown) defined by IEEE 1394 or the like.

In these devices, the video signal processing circuit 6 performs compression according to JPEG-2000, for example. Here, in this JPEG-2000, the high-definition television signal HD is converted to, for example, 25 by performing wavelet transform and entropy coding.
It is possible to compress to Mbps. In addition, JPEG
Since -2000 is a compression means for still images originally, compression in the frame is performed also in this case.

That is, in this device, the input terminal 25
The high-definition television signal HD supplied to is compressed by JPEG-2000 for each frame. Then, an error correction code and an uncompressed audio signal are added to this compressed video signal, and these signals are recorded on a recording medium at a fixed rate. As a result, the high definition television signal HD is recorded as a series of still images JP-2 for each frame as shown in A of FIG. 2, for example.

Further in this case, for example, the above-mentioned JPEG
By using -2000, the high definition television signal HD is set to, for example, 4: 2: 0 as the base band,
It can be compressed to a fixed rate of 25 Mbps. This rate is equal to the recording rate of the current DV system VTR, and this compressed signal can be recorded in the standard mode of the DV system VTR as shown in A of FIG. 3, for example. is there.

That is, in the above-described embodiment, in the standard mode of the current DV system VTR, as shown in FIG. 3A, for example, recording is performed in a pattern in which one frame has 10 tracks on the tape. . In each of these tracks, an area for video signal data is provided at the center, an area for subcode is provided at one end, and an ITI area for recording control information and audio signals is provided at the other end. A data area is provided.

In this recording pattern, the bit rate of the video signal data area is [the number of provided sync blocks × 77 bytes × the number of tracks × frames × correction value]. Specifically, 135 × 77 × 8 × 10 × 3
It is 0 × 1000/10001 = 24.923 Mbps.

Therefore, the above-mentioned high definition television signal HD
, Can be recorded in the video signal data area of the above-mentioned current DV system VTR. And in this case,
For example, by using JPEG-2000, it becomes possible to compress the high definition television signal HD to a fixed rate of 25 Mbps with a base band of 4: 2: 0. In this case, the audio signal is recorded uncompressed.

Therefore, in this embodiment, for example, the high definition television signal HD can be compressed and recorded at a fixed rate of 25 Mbps. It should be noted that the recording of the high definition television signal HD in the current DV system is 50 Mbps.
Thus, the recording time is halved, but this is not the case according to the above-described embodiment. The image quality is extremely high because the baseband is 4: 2: 0. Furthermore, in this recording, the recording of the audio signal is uncompressed.

By the way, in the case of compressing and recording the high definition television signal HD, for example, 1440 × 10
The compression will be performed on 80 pixels. JP here
When using EG-2000, it is desirable that the image on which the wavelet transform is performed is square (hereinafter referred to as tile). Therefore, for example, since the greatest common divisor of 1440 and 1080 is 360, the minimum number of tiles equally divided into squares is 12, as shown in A of FIG. 10, for example.

However, when the video signal is compressed, if the number of tiles is reduced, for example, the compression efficiency within one tile increases, but the image quality deterioration during variable speed reproduction also increases. On the other hand, if the number of tiles is increased, the compression efficiency within one tile is reduced, but the image quality deterioration during variable speed reproduction is reduced. Therefore, when the recording method is determined and the recording device is developed, the number of tiles is determined in consideration of the image quality and the compression efficiency.

As a practical embodiment, FIG. 10B shows a case where tiles are divided into 72 × 72 pixels. Here, the tile is divided into horizontal 20 × vertical 15 tiles. Furthermore, if the size of this tile is a common divisor of 1440 and 1080, for example, 36 × 36 or 12 ×
Although it may be 12, the number of pixels is preferably a multiple of 8 in consideration of the design of hardware for performing compression processing, and therefore 72 × 72 is appropriate.

The tile thus divided is further divided into, for example, five regions in the horizontal direction as shown by the solid line in the figure. Therefore, in this case, each area is composed of 4 horizontal × 15 vertical tiles. Then, for example, as shown by hatching in the drawing, one tile a, b, c, from each of these regions,
d and e are taken out, and these five tiles are collected and fixed length compression is performed by using these as a unit. This makes it possible to average and compress the fine and flat portions of the image, for example.

Further, with respect to the tiles thus compressed, the positions of the respective tiles are returned to their original positions and recording is performed. In this way, so-called shuffling compression is performed, and deshuffling is performed before recording, thereby improving the image quality of a reproduced image when performing reproduction (search reproduction) in a high-speed running state of a recording medium, for example. Can be achieved.

That is, when a DV VTR, for example, is used as the recording device, recording is performed with one frame having 10 tracks as shown in FIG. Therefore, during variable speed reproduction, for example, as shown in the figure, the head crosses the track diagonally, so that the range in which data cannot be acquired becomes considerably wide. However, by performing the above processing, it is possible to form a fairly easy-to-see image by substituting the previous frame for the place where data could not be acquired.

Further, in such shuffling, the size of the tiles described above is such that the image quality diffusion efficiency decreases as the number of tiles decreases, and the image quality diffusion efficiency increases as the number of tiles increases. Further, if the number of tiles is reduced, the hardware load and processing time increase, and if the number of tiles is increased, the hardware load and processing time decrease. Therefore, the number of tiles is determined in consideration of these points.

Further, FIG. 12 shows a reproducing apparatus for reproducing a high definition television signal recorded on, for example, a tape-shaped recording medium by applying the above-described video signal recording method and apparatus according to the present invention. Disclosed is a block diagram showing the configuration of one embodiment when forming. In the following description, parts corresponding to those in the embodiment shown in FIG.

In FIG. 12, for example, a signal reproduced by a video head (not shown) from a tape-shaped recording medium (not shown) passes backwards using the RF block 12 as a reproducing means, and an error correction and signal forming circuit. 7 is supplied. Further, the signal supplied to the video signal transmission means (not shown) defined by the above-mentioned IEEE 1394 or the like reversely passes through the LINK / PHY circuit 13 and the QT file circuit 24, which are the interface means, for error correction and signal formation. It is supplied to the circuit 7.

In the error correction and signal forming circuit 7,
The digital video signal and the digital audio signal mixed by the time division described above are separated, and at the same time, for example, 16
In cooperation with the M memory 8, error correction is performed using the error correction code added during recording. Then, first, the separated digital audio signal is supplied to the D / A conversion circuit 30 through the audio signal processing circuit 11, and the restored audio signal is taken out to the output terminal 31.

The separated digital video signal is supplied to the video signal processing circuit 6, and the entropy coding circuit 5 is supplied.
And the wavelet transform circuit 4 in reverse, for example, 4:
A 2: 0 baseband digital video signal is restored. Further, the baseband digital video signal is supplied to the video buffering device 27 having a clock frequency of 55.6875 MHz, for example. The horizontal resolution of this video buffering device 27 is 1440H → 1.
Converted to 920H.

Further, this video buffering device 27
The digital video signal converted by is supplied to the screen display (OSD) circuit 32 to synthesize an image displayed on the screen.
This combined signal is supplied to the synchronization generating circuit 3 to add a necessary synchronization signal. The digital video signal to which the synchronization signal is added has, for example, a clock frequency of 74.25.
The high-definition television signal HD that is supplied to the D / A conversion circuit 34 of MHz and restored is taken out to the output terminal 35.

In this way, a high-definition television signal recorded on, for example, a tape-shaped recording medium (not shown)
The HD is reproduced and taken out to the output terminal 35. In this case, for example, since the video signal compressed by JPEG-2000 is expanded for each frame, it is possible to easily perform variable speed reproduction such as slow reproduction or double speed reproduction, and recorded high definition. The editing and insert recording of the television signal HD can be easily performed.

Further, for example, a video signal compressed by JPEG-2000 can be expanded at an arbitrary resolution. Therefore, for example, as shown in FIG. 13, in the recording device integrated camera 100, the recorded video signal is converted into a coded stream of, for example, 300 Kbps, and the video signal is transmitted to, for example, the mobile phone 200 via an interface such as Bluetooth. It becomes possible to send. Alternatively, the down converter can be eliminated when forming an NTSC video signal of 640 × 480 pixels, for example.

Alternatively, as shown in FIG. 14, a video signal from the recording device-integrated camera 100 is transmitted to, for example, IEEE1.
By importing into the personal computer 300 or the like via the interface of 394, 1920 × 10
It is possible to easily capture a still image of 80 pixels, edit a high definition television signal HD, edit and capture a video signal of 640 × 480 pixels, and create an application by using the QT format.

Therefore, in these embodiments, the video signal is intraframe-compressed using the wavelet transform and entropy coding, and the compressed signal is recorded on the recording medium at a fixed rate, so that the compression efficiency is improved. The function is large, and functions such as editing, variable speed reproduction, and insert recording can be easily performed, and high-definition television signals can be recorded well.

As a result, in the conventional apparatus, since the compression efficiency is low, the recording time becomes short and the resolution becomes insufficient. Alternatively, when the image compression technique based on the MPEG-2 system is used, editing becomes difficult and functions such as variable speed reproduction cannot be performed. Further, in the recording of high-definition television signals, it is possible to easily eliminate these problems according to the present invention, which could not be recorded satisfactorily because the recording time was further shortened. is there.

The JPEG-type used in the above embodiment is used.
Table 2 shows a comparison between the 2000 moving image version (referred to as JPEG2000-MOVIE) and the MPEG-2 and DV systems.
Shown in. As is clear from Table 2, JPEG200
In terms of hardware, 0-MOVIE can significantly reduce the number of gates as compared with MPEG-2. Further, the compression efficiency can be improved as compared with the DV system.

[0075]

[Table 2]

When an image is broken due to a loss of a reproduction signal or the like, for example, compression by MPEG-2 causes a block-like change in image quality, resulting in extremely poor image quality. With -2000, the resolution is only reduced, so an image that is relatively easy to see can be obtained.

Table 3 also shows the JPEG-20 used in the above embodiment for recording high definition television signals.
00 is compared with the MPEG-2 and DV systems. As is clear from Table 3, when JPEG-2000 is used, it is possible to realize all the functions of the DV system, which are not possible with MPEG-2, and it is possible to further improve the compression efficiency as compared with the DV system. Is.

[0078]

[Table 3]

Thus, according to the above-mentioned video signal recording method, the video signal is compressed in the frame by using the wavelet transform and the entropy coding, and the compressed signal is recorded on the recording medium at a fixed rate to compress the signal. The efficiency is high, and functions such as editing, variable speed reproduction, and insert recording can be easily performed, and recording of high definition television signals can be performed well.

Further, according to the above-mentioned video signal recording apparatus, the compression means for compressing the video signal in the frame by using the wavelet transform and the entropy coding, and the compressed signal are recorded on the recording medium at a fixed rate. By having a recording means, the compression efficiency is high, and functions such as editing, variable speed reproduction, and insert recording can be easily executed, and further recording of high-definition television signals can be performed well. Is.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the present invention.

[0082]

Therefore, according to the first aspect of the present invention, the video signal is intraframe-compressed by using the wavelet transform and entropy coding, and the compressed signal is recorded on the recording medium at a fixed rate. Thus, the compression efficiency is high, and functions such as editing, variable speed reproduction, and insert recording can be easily performed, and further, high definition television signals can be recorded well.

According to the second aspect of the present invention, the fixed rate is set to 25 Mbps and the data is recorded by an arbitrary digital recording device, so that good recording can be performed in the standard mode of the DV system VTR or the DVD recorder. It is a thing.

According to the third aspect of the invention, the fixed rate is set to 12.5 Mbps, and the recording is performed in the long-time recording mode of an arbitrary digital recording device.
Good recording can be performed by the long-time mode of the system VTR or a DVD recorder.

According to the invention of claim 4, the fixed rate is set to 6.25 Mbps and the recording density is further halved as compared with the long-time recording mode of an arbitrary digital recording apparatus. Good recording can be performed in the long-time mode or in the DVD recorder.

According to the invention of claim 5, since the recording medium is in the form of a tape, for example, the DV system VTR
With this, good recording can be performed.

According to the sixth aspect of the invention, since the recording medium is disk-shaped, good recording can be performed by, for example, a DVD recorder.

According to the invention of claim 7, the video signal is a high-definition television signal, and by recording this high-definition television signal on a recording medium at a fixed rate of 25 Mbps, for example, the DV system can be used. Good recording can be performed in the standard mode of the VTR or the DVD recorder.

According to the eighth aspect of the present invention, the frame of the high definition television signal is divided into a plurality of tiles, wavelet transform is performed for each tile, and the arrangement of the tiles is shuffled and shuffled. Tiles are compressed as a group with a fixed length and recorded on a recording medium, so that, for example, the standard mode of the DV system VTR or D
Good recording can be performed with a VD recorder.

Further, according to the invention of claim 9, the video signal is intra-frame compressed by using the wavelet transform and entropy coding, and the compressed signal is recorded on the recording medium at a fixed rate. The compression efficiency is high, and functions such as editing, variable speed reproduction, and insert recording can be easily executed, and recording of high-definition television signals can be performed well.

According to the tenth aspect of the present invention, the fixed rate is set to 25 Mbps and the data is recorded by an arbitrary digital recording device, so that good recording can be performed in the standard mode of the DV system VTR or the DVD recorder. It is a thing.

According to the eleventh aspect of the invention, the fixed rate is set to 12.5 Mbps and recording is performed in the long-time recording mode of an arbitrary digital recording device.
Good recording can be performed in a long-time mode of a V system VTR or a DVD recorder.

According to the twelfth aspect of the present invention, the fixed rate is set to 6.25 Mbps, and the recording density is further halved as compared with the long-time recording mode of any digital recording apparatus. Good recording can be performed in the long-time mode or in the DVD recorder.

According to the thirteenth aspect of the invention, since the recording medium is in the form of tape, for example, the DV system VT is used.
With R, good recording can be performed.

According to the fourteenth aspect of the invention, since the recording medium is in the form of a disk, good recording can be performed, for example, by a DVD recorder.

According to the fifteenth aspect of the present invention, the video signal is a high-definition television signal, and by recording this high-definition television signal on a recording medium at a fixed rate of 25 Mbps, for example, the DV system is used. Good recording can be performed in the standard mode of the VTR or the DVD recorder.

According to the sixteenth aspect of the present invention, the frame of the high definition television signal is divided into a plurality of tiles, the wavelet transform is performed for each tile, and the tiles are shuffled and shuffled. By compressing the tiles as a group with a fixed length and recording them on a recording medium, good recording can be performed, for example, in a standard mode of a DV system VTR or a DVD recorder.

As a result, in the conventional apparatus, since the compression efficiency is low, the recording time becomes short and the resolution becomes insufficient. Alternatively, when the image compression technique based on the MPEG-2 system is used, editing becomes difficult and functions such as variable speed reproduction cannot be performed. Further, in the recording of high-definition television signals, it is possible to easily eliminate these problems according to the present invention, which could not be recorded satisfactorily because the recording time was further shortened. is there.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment in which a recording apparatus for recording a standard television signal on a tape-shaped recording medium is formed by applying a video signal recording method and apparatus according to the present invention. Is.

FIG. 2 is a diagram for explaining the explanation.

FIG. 3 is a diagram for explaining a DV system VTR.

FIG. 4 is a diagram for explaining the explanation.

FIG. 5 is a diagram for explaining the explanation.

FIG. 6 is a diagram for explaining the explanation.

FIG. 7 is a block diagram showing the configuration of an embodiment in which a recording device for recording a standard television signal on a disc-shaped recording medium is formed by applying the video signal recording method and device according to the present invention. Is.

FIG. 8 shows a configuration of an embodiment in which a recording apparatus for recording a high definition television signal on a tape-shaped recording medium is formed by applying the video signal recording method and apparatus according to the present invention. It is a block diagram.

FIG. 9 shows a configuration of another embodiment in the case of forming a recording device for recording a high-definition television signal on a tape-shaped recording medium by applying the video signal recording method and device according to the present invention. It is a block diagram shown.

FIG. 10 is a diagram for explaining that.

FIG. 11 is a diagram for explaining that.

FIG. 12 is an embodiment in which a reproducing apparatus for reproducing a high-definition television signal recorded on, for example, a tape-shaped recording medium is formed by applying the video signal recording method and apparatus according to the present invention. 3 is a block diagram showing the configuration of FIG.

FIG. 13 is a diagram for explaining the explanation.

FIG. 14 is a diagram for explaining the explanation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Input terminal, 2 ... Luminance / chroma separation and chroma decoding circuit, 3 ... A / D conversion circuit, 4 ... Wavelet conversion circuit, 5 ... Entropy coding circuit, 6 ... Video signal processing circuit, 7 ... Error correction and signal Forming circuit, 8 ... 16M memory, 9 ... Input terminal, 10 ... A / D conversion circuit, 11 ... Audio signal processing circuit, 12 ... RF block, 13 ... LINK
/ PHY circuit

Front page continuation (51) Int.Cl. ⁷ identification code FI theme code (reference) H04N 7/133 A (72) Inventor Takahiro Fukuhara 6-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F Term (reference) 5C053 FA22 FA24 GA11 GB05 GB15 GB18 GB36 JA01 KA01 KA25 LA06 LA07 5C059 LA10 MA00 MA24 MA45 ME01 PP16 RF05 RF21 SS11 SS15 5D044 AB07 BC01 CC03 GK07 GL01 GL10 HL11 5J064 AA02 BA09 BA16 BD03 BC01 BD03

Claims (16)

[Claims] 1. A method of recording a video signal, which comprises compressing a video signal in a frame using wavelet transform and entropy coding, and recording the compressed signal on a recording medium at a fixed rate. 2. The method of recording a video signal according to claim 1, wherein the fixed rate is set to 25 Mbps and recording is performed by an arbitrary digital recording device. 3. The video signal recording method according to claim 1, wherein the fixed rate is set to 12.5 Mbps, and recording is performed in a long-time recording mode of an arbitrary digital recording device. 4. The fixed rate is set to 6.25 Mbps, and recording is performed at a recording density which is 1/2 of that in a long-time recording mode of an arbitrary digital recording device.
Recording method of the described video signal. 5. The method of recording a video signal according to claim 1, wherein the recording medium has a tape shape. 6. The method of recording a video signal according to claim 1, wherein the recording medium has a disk shape. 7. The video signal recording according to claim 1, wherein the video signal is a high definition television signal, and the high definition television signal is recorded on a recording medium at a fixed rate of 25 Mbps. Method. 8. The frame of the high-definition television signal is divided into a plurality of tiles and wavelet-transformed for each of the tiles, and the arrangement of the tiles is shuffled to form the shuffled plurality of tiles as a group. 8. The video signal recording method according to claim 7, wherein the video signal is compressed with a fixed length and recorded on a recording medium. 9. A video comprising: a compression means for compressing a video signal in a frame by using wavelet transform and entropy coding; and a recording means for recording the compressed signal on a recording medium at a fixed rate. Signal recorder. 10. The video signal recording apparatus according to claim 9, wherein the fixed rate is set to 25 Mbps and recording is performed by an arbitrary digital recording apparatus. 11. The video signal recording apparatus according to claim 9, wherein the fixed rate is 12.5 Mbps and recording is performed in a long-time recording mode of an arbitrary digital recording apparatus. 12. The fixed rate is set to 6.25 Mbps, and recording is performed at a recording density which is 1/2 of that in a long-time recording mode of an arbitrary digital recording device.
The video signal recording device described. 13. The video signal recording apparatus according to claim 9, wherein the recording medium is tape-shaped. 14. The video signal recording apparatus according to claim 9, wherein the recording medium has a disk shape. 15. The video signal recording according to claim 9, wherein the video signal is a high definition television signal, and the high definition television signal is recorded on a recording medium at a fixed rate of 25 Mbps. apparatus. 16. A unit for dividing a frame of the high definition television signal into a plurality of tiles and performing a wavelet transform for each of the tiles, and shuffling the arrangement of the tiles to group the plurality of shuffled tiles. 16. The apparatus for recording a video signal according to claim 15, further comprising means for compressing with a fixed length and recording it on a recording medium.