JP3375431B2 - Optical disk, recording method, reproducing method and reproducing apparatus for optical disk - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates to a high-efficiency encoded data is converted into the digital video data recorded optical disk recording method of the optical disk, a reproducing method and playback device.

[0002]

2. Description of the Related Art FIG. 10 is a block circuit diagram showing a conventional optical disk recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 4-114369. Reference numeral 1 denotes A / A for converting an analog video signal into digital video data. D converter, 2 is information compression means for compressing digital data, 3 is frame sector conversion means for converting the compressed data into sector information equal to an integral multiple of the frame period, 4 is an encoder for converting to an optical disc format, and 5 is A modulator for converting into a modulation code in order to reduce interference on the optical disk, 6 is a laser drive circuit for modulating a laser according to the modulation code, 7
Is a laser output switch, 8 is an optical head for emitting a laser, 9 is an actuator for tracking the light beam emitted from the optical head 8, 10 is a traverse motor for sending the optical head 8, 11 is a disk motor for rotating the optical disk 12, Reference numeral 19 is a motor drive circuit, and 20 is a motor control circuit.

Reference numeral 13 is a reproduction amplifier for amplifying the reproduction signal from the optical head 8, 14 is a demodulator for demodulating the recorded modulated signal, 15 is a decoder, 16 is a frame sector converting means, and 17 is decompressed compressed data. Information decompression means, 1
Reference numeral 8 is a D / A converter for converting the expanded video data into an analog video signal.

FIG. 11 is an MPEG standardized for compressing digital video data for transmission and storage.
FIG. 11 is a diagram showing a data array structure (layer structure) of the method.
Reference numeral 01 is a GOP composed of a plurality of frame information, 1102 is a GOP layer composed of several pictures (screens), 1103 is a slice obtained by dividing one screen into several blocks, and 1104 is composed of several macroblocks. Slice layer, 1105 is a macroblock layer composed of several blocks, and 1106 is 8
It is a block layer composed of pixels × 8 pixels.

FIG. 12 is a diagram showing a coding structure when 9 screens are 1 GOP. 1201 is an I picture coded in a frame, 1202 is a P picture, and the I picture or P picture 1202 is Inter-frame coding is performed by referring to the forward motion compensation. Reference numeral 1203 is a B picture which is inter-frame coded by motion compensation in both directions with reference to the I picture 1201 and the P picture 1202 which are temporally located before and after.

Next, the operation of the conventional optical disk recording / reproducing apparatus will be described. In order to record video data having a large amount of information on a medium such as an optical disk, it is general to record the information after compressing the amount of information. FIG. 10 is a block circuit diagram of a recording / reproducing apparatus for recording video data on an optical disc as described above. The video data digitized by the A / D converter 1 is processed by the information compression means 2 by a standard compression method such as MPEG. Compressed. This compressed data is encoded, modulated to reduce the influence of intersymbol interference on the optical disc, and recorded on the optical disc 12. At this time, for example, the data amount in each GOP unit is set to be approximately the same amount, and the data is distributed to sectors equal to an integral multiple of the frame period, so that the GOP unit can be edited.

At the time of reproduction, the compressed data reproduced from the optical disk 12 is amplified by the reproduction amplifier 13 and restored to digital data by the demodulator 14 and the decoder 15. After that, the frame sector reverse conversion means 16 addresses
Data such as parity is removed to obtain pure video compression data. This compressed data is restored to digital video data by the information expansion means 17 by the MPEG decoding method, converted into an analog video signal by the D / A converter 18 and displayed on a monitor or the like.

Here, when the MPEG method is used as the method of compressing digital video data as described above, as shown in FIG. 12, an I picture 1201 and a P picture 12 are used.
02 and continuous GOP data including the B picture 1203 is recorded on the optical disc.

At this time, since the I picture is compressed within the frame, image reproduction is possible only with the I picture data. However, since the P picture is compressed by adding motion compensation by the I picture in the forward direction in time, it cannot be reproduced until the I picture is restored. For the same reason, B picture can be reproduced only after I picture or P picture is restored.

[0010]

Since the digital video data recorded on the optical disc is configured as described above, the only picture that can be independently decoded is the I picture. Therefore, conventionally, an image that can be searched when performing an image search or the like has been limited to an I picture.

The present invention has been made to solve the above problems. A first object of the present invention is to speed up the retrieval of images of all types of I pictures, P pictures and B pictures. To get an optical disc that can be searched.

[0012] A second object is to obtain an image search method in which images of all types of I picture, P picture and B picture are selected in advance and a plurality of images can be displayed and searched at the same time during reproduction.

A third object is to record the selected image on the optical disc and display a plurality of reduced selected images on the monitor at the same time during the retrieval so that the user can judge the contents and retrieve the optical disc. To obtain a recording / reproducing device.

[0014]

SUMMARY OF THE INVENTION An optical disc according to the present invention includes an I picture that is data-compressed within a frame and a time
Data by adding motion compensation using I-pictures in the forward direction
Compressed P-picture and I-picture in forward and backward direction in time
Data compression by adding motion compensation using a P-picture or P-picture
Image information block in which mixed B pictures are mixed into one unit.
Digital video data consisting of a sequence including lock
Is an optical disc recorded in the video data area,
The optical disc is composed of sectors and has the above sequence.
Of the sequence header sector at the beginning of the
Image table information including dress information is the video data.
Placed in the image information table area, which is different from the area
The address information of the image information table is
Displays the selection screen when selecting an image, and
This is information for accessing the header.

The optical disc recording method of the present invention is
I-picture data compressed in the frame and temporally
Data compression by adding motion compensation using forward I-pictures
P-pictures and I-pictures that are temporally forward and backward.
Data is compressed by adding motion compensation using P-pictures.
Video information block that has a mixed B picture and 1 unit.
Digital video data consisting of a sequence containing
It is recorded in the video data area of the optical disc composed of sectors.
Sequence header at the beginning of the above sequence
Image table information including address information corresponding to
Information in the image information area that is different from the video data area.
It is a method of recording on an optical disc that is placed in the report table area.
The address information in the image information table is
When selecting an image, display the selection screen and
This is information for accessing the header.

The optical disk reproducing method of the present invention is
I-picture data compressed in the frame and temporally
Data compression by adding motion compensation using forward I-pictures
P-pictures and I-pictures that are temporally forward and backward.
Data is compressed by adding motion compensation using P-pictures.
Video information block that has a mixed B picture and 1 unit.
Digital video data consisting of a sequence containing
It is recorded in the image data area and is recorded at the beginning of the above sequence.
Image table information including position information of sequence header
Is image information that is an area different from the video data area
With the method of playing the optical disc placed in the table area
There is no access to the image table information on the optical disc.
Location information of sequence header by accessing
The selected image based on the position information of the sequence header.
Decoding the image, converting the selected image to a reduced image,
Extraction of position information, decoding of the selected image and the reduced image
Create selection screen by repeating conversion
Is.

The optical disk reproducing apparatus of the present invention comprises:
I-picture data compressed in the frame and temporally
Data compression by adding motion compensation using forward I-pictures
P-pictures and I-pictures that are temporally forward and backward.
Data is compressed by adding motion compensation using P-pictures.
Video information block that has a mixed B picture and 1 unit.
Digital video data consisting of a sequence containing
It is recorded in the image data area and is recorded at the beginning of the above sequence.
Image table information including position information of sequence header
Is image information that is an area different from the video data area
A device that plays optical disks placed in the table area
There is no access to the image table information on the optical disc.
Location information of sequence header by accessing
Based on the position information of the sequence header
And a means for decoding the selected image and a reduced image from the selected image.
Means for converting into an image, extraction of the position information, the selected image
By repeating the image decoding and the reduced image conversion,
And means for creating a selection screen.

[0018]

EXAMPLES Example 1. FIG. 1 is a diagram showing a structure of image data recorded on an optical disk and a structure of an image information table in which information necessary for retrieving selected image data is recorded in Example 1 of the present invention. 1A is a schematic diagram showing an encoded data structure recorded on an optical disc,
Reference numeral 101 is a sequence header, 102 is a GOP, 103 is a GOP header, 107 is a start address of the sequence header 101, 108 is a start address of the GOP header 103, and 109 is a start address of a B6 picture.

FIG. 1B is a schematic view of the image information table recorded on the optical disc, 110 is the selected image number attached to each selected image, 111 is the start address of the sequence header relating to the sequence including the selected image. Is a column for writing the header address of the GOP header including the selected image, and 113 is a column for writing the header address of the selected image data.

FIG. 9 is a diagram showing the format of the optical disc in the present embodiment. 901 is a track on which video data is recorded, 902 is a sector of video data, and 903.
Is a video data area in which video data is recorded, 904 is a file management area in which basic data such as the type of optical disc is recorded, and 905 is an image information table area in which an image information table is recorded.

Next, the structure of video data recorded on the optical disk will be described. A GOP (Group) that is a collection of some image (picture) data of the input video data.
The following pictures are included in (of picture) 102. That is, an I picture 104 that is data-compressed in a frame, a P picture 105 that is data-compressed by adding motion compensation by an I picture that is temporally forward, and a motion that is an I picture or P picture that is temporally forward or backward. The B picture 106 is data-compressed with compensation. Then, a GOP header 103 in which information necessary for decoding each picture in the GOP 102 is recorded is added to the head of each of these GOPs 102, and further, to the head of a sequence in which a plurality of GOPs 102 are collected,
A sequence header 101 in which information such as the screen size of the sequence is recorded may be added. Video data composed of such data is recorded on an optical disc to which an address is assigned.

The video data recorded on the optical disc can be reproduced by performing the reverse procedure of the recording procedure.

Further, when the user selects a screen (hereinafter referred to as "selected image") for the purpose of retrieval or the like, if the selected image is the B6 picture 106, the B6 picture 106 is decoded at the time of reproduction. To decode the I1 picture 104 and the P4 picture 105, it is necessary to decode the I1 picture 104 to decode the P4 picture 105. Furthermore, I1 picture 10
Since the information for decoding 4 is described in the GOP header 103, the information in the GOP header 103 is necessary. Normally, since only one I picture exists in the GOP 102 and an I picture exists after the GOP header 103, in order to display the B6 picture 106 as a selected image, the GOP 10 including the B6 picture 106 is eventually displayed.
2 is read from the GOP header 103, I1 picture,
The B2 picture, the B3 picture, ... Are decoded in this order, and finally the B6 picture 106 is decoded and displayed. Therefore, the start address 109 on the optical disc on which the data of the B6 picture 106 is recorded and the B6 picture 1
GOP header start address 1 of GOP 102 including 06
08 is required.

In order to record the address information of such a selected image on the optical disk 12, the address information of the selected image is stored in the memory of the recording / reproducing apparatus and is provided on the optical disk at an appropriate time desired by the user. Recorded in the image information table.

At this time, in addition to the address information of the selected image, the information of the sequence header 101 necessary for decoding the B6 picture 106 may be required, so the start address 107 of the sequence header 101 is also image information. Record on the table. FIG. 1B shows an image information table recorded on the optical disc in this way.

When the B6 picture 106 is searched from the optical disc recorded by the above method, the following operation is performed. First, when a search command for the B6 picture 106 is input, the image information table of the optical disc is accessed to start the B6 picture 106 with the start address 109 and B
GOP header 1 of GOP 102 including 6 pictures 106
03 start address 108 and, if necessary, read the start address 107 of the sequence header 101,
Corresponding sequence header 101 to GOP header 10
Jump to 3 and read the address information written there. Then, the I1 picture 104 to the P4 picture 10
5 and B6 picture 106 are decoded in this order, and B6 picture 1
When the decoding of 06 is completed, the screen of the B6 picture 106 is displayed on the monitor and the search is completed.

In this example, the B6 picture 106 is selected as the selected image, but similar processing may be performed when another picture is selected.

By the way, the first B2 and B in the GOP
Since the B picture of 3 has to be decoded by using the last I picture or P picture of the GOP before the GOP 102, the independence of the GOP unit is lost. In order to prevent this, it is necessary to give the GOP header 103 information indicating that such a B picture is decoded by backward compensation. That is, in the first embodiment, the prediction is made only from the I1 picture 104.

Example 2. FIG. 2 is a block circuit diagram showing an optical disc recording / reproducing apparatus according to a second embodiment of the present invention, and shows a component for recording and reproducing the video data of the input video signal and the image information table of the first embodiment on the optical disc. . In the figure,
1 is an A / D converter for converting an analog video signal into digital video data, 2 is an information compression means for compressing digital video data, 4 is an encoder, 5 is a modulator, 6 is a laser drive circuit, and 20 is a control circuit. , 8 is an optical head, 9 is an actuator, 11 is a disk motor, and 12 is an optical disk. Reference numeral 23 is an address memory for storing the start address of encoded data of a selected image such as a search image or the start address of data including information necessary for decoding this encoded data, and 24 is the address memory 23. For example, it is a switch operated when recording the content on the optical disk 12 at an appropriate time desired by the user. Also,
13 is a reproduction amplifier, 14 is a demodulator, 15 is a decoder, 1
Reference numeral 7 is an information expanding means, 18 is a D / A converter, and 60 is an output video signal.

Video data having the GOP structure described in the first embodiment is recorded in the video data area 903 of the optical disk 12. At the head of each GOP 102, a GOP header 103 containing information necessary for decoding each picture in each GOP 102 is added. In addition, a sequence header 101 including information about the sequence may be added to the beginning of the sequence composed of a plurality of GOPs 102.

Next, the operation will be described. To reproduce the optical disc 12, the compressed video data recorded on the optical disc 12 is reproduced by the optical head 8, amplified by the reproduction amplifier 13, and the compressed video data is restored by the demodulator 14 and the decoder 15. Then, the digital video data is restored by the information expansion means 17 by the MPEG decoding method, and the analog output video signal 60 is obtained by the D / A converter 18 and displayed on the monitor or the like.

In the address memory 23 during the reproducing operation, the head address on the optical disc of the selected image data selected by the user during the reproduction and the G containing the selected image data are displayed.
The information necessary for reproducing the selected image such as the start address of the GOP header of the OP and the start address of the sequence header regarding the sequence including this GOP is stored.

The contents of the address memory 23 are recorded in the image information table area provided on the optical disk 12 by operating the switch 24 at the time when the user desires.

By using the image information table of the optical disc 12 recorded in this way, the optical disc 1
It is possible to search and display any selected image recorded in No. 2. The reason is described in detail in the description of the first embodiment.

FIG. 3 is a flow chart of the operation of searching and displaying the selected image. When the search of the selected image is started, the image information table provided on the optical disk 12 is accessed,
Start address of selected image data, GOP including selected image
GOP header address, sequence header address, etc. are stored.

Based on these pieces of information, the sequence header is accessed to obtain the sequence information. And GO
The P header is accessed, and the decoding is started from the first picture of the GOP. Then, after the decoding of the picture of the selected image is completed, the selected image is displayed.

Example 3. FIG. 4 is a block circuit diagram showing an optical disk recording / reproducing apparatus according to a third embodiment of the present invention. The same or corresponding portions as those in FIG. 2 are designated by the same reference numerals and detailed description thereof will be omitted. In the figure, 21 is an address monitoring circuit for associating video data with addresses on the optical disk 12, 22 is a header detection circuit for detecting a GOP header or sequence header in a bit stream of video data, and 24 is a switch for the user. When operated at a desired time, the input video signal 50 is switched to the content stored in the address memory 23 and recorded on the optical disk 12.

Since the operation of recording the input video signal 50 on the optical disk 12 and the operation of reproducing the output video signal 60 from the optical disk 12 of the third embodiment are the same as those of the second embodiment, the description thereof will be omitted. The operation of recording and reproducing information (selected image information) necessary for searching and reproducing the image selected by the user during the recording operation will be described below.

The GOP header 108 and the sequence header 107 include a unique word which is information for identifying each, and various headers can be detected and determined by detecting the unique word. The header detection circuit 22 detects the GOP header 108 and the sequence header 109 using this unique word. The address monitoring circuit 21 monitors which address on the optical disc 12 the currently recorded image data is recorded from these detected addresses, and the address memory 23 stores this address.

Now, when the user selects a selected image for searching or the like, the image selection signal 70 causes the address monitoring circuit 21 to change.
The address memory 23 repeats the operation of storing the address at which the selected image data is recorded and the operation of storing the address of the selected image every time the image selection signal 70 is input. The address (selected image information) thus stored in the address memory 23 is recorded in the image information table area 905 provided on the optical disc 12 when the user operates the switch 24 at a desired time.

By using the selected image information recorded on the optical disk 12 in this way, the selected image recorded on the optical disk 12 can be searched and displayed. The reason for this has been described in detail in the description of the first embodiment and will not be repeated.

Example 4. FIG. 5 is a block circuit diagram showing an optical disk recording / reproducing apparatus in Embodiment 4 of the present invention, and the same reference numerals as those in FIG. 2 indicate the same or corresponding portions, and therefore the description thereof will be omitted. In the figure, 25 is G in the video data being reproduced.
In the header detection circuit that detects the OP header and the sequence header, the address monitoring circuit 21 monitors these detected addresses, and the address memory 23 contains the information necessary for decoding the image data being reproduced. Stores the start address of the data.

Next, the operation of recording the selected image information selected during the reproducing operation on the optical disc will be described. When the user looks at the image being reproduced and selects it, the image selection signal 70 is input to the address monitoring circuit 21, and the address at this time is stored in the address memory 23.

The address information stored in the address memory 23 is recorded in the image information table area of the optical disk 12 when the user operates the switch 24.

The operation of searching, reproducing and displaying the selected image is the same as that in the third embodiment, and therefore its explanation is omitted.

Example 5. FIG. 6 is a block circuit diagram showing an optical disk recording / reproducing apparatus according to a fifth embodiment of the present invention. Since the same reference numerals as those in FIG. 2 indicate the same or corresponding portions, the description thereof will be omitted. In the figure, 26 and 27 are switches for switching between the normal reproduction operation and the selected image list display operation,
28 is a low-pass filter (LPF) necessary for reducing the reproduced selected image data, 29 is a sub-sampling circuit, and 30 is a list image memory for storing the list display image data.

During reproduction of a normal video signal, the output video data of the information decompression means 17 is switched through the switches 26 and 27 to D.
The video signal 60 is input to the A / A converter 18 and output.

On the other hand, when the list image display signal 80 is input, the operation shifts to the list image display operation, the control circuit 20 reads the selected image information from the image information table area 905, and the image data expanded by the information expansion means 17 is displayed. The high frequency component is removed from the switch 26 by being input to the LPF 28, and subsampled by the sub-sampling circuit 29 to 1 / N to become reduced image data of 1 / N, and the reduced image data is stored in the list image memory 30. . By repeating such a series of operations, the list image memory 30 stores the list image data configured by the reduced screen of the N selected images recorded in the optical disc 12. FIG. 7 shows a flowchart of the above series of operations.

Next, the list image data stored in the list image memory 30 is input to the D / A converter 18 via the switch 27, and the decoded list image signal 90 is output to the monitor, as shown in FIG. The list display image as shown is displayed. The user can easily search for a desired image from the displayed list image.

In each of the above embodiments, the selected image is mainly used as the search image. However, it is obvious that the present invention can be applied to the image for the beginning of the program, the image for which the reproduction is interrupted last time, or the like. Is.

[0051]

Since the present invention is constructed as described above, it has the following effects.

According to the present invention, an image such as a search image can be arbitrarily selected.
Can be set to. In addition, the video signal
Search image etc. from the image in the video signal while recording on the disc
Image can be selected. Furthermore, a video disc
During playback of the video signal recorded in,
An image such as a search image can be selected from the above. Also,
You can easily judge and check the contents recorded on the deodisc.
You can search.

[Brief description of drawings]

FIG. 1 is a diagram showing a structure of encoded data for explaining an optical disc recording / reproducing method in a first embodiment of the present invention.

FIG. 2 is a block circuit diagram showing an optical disc recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 3 is a second embodiment, a third embodiment, and a fourth embodiment of the present invention.
5 is a flowchart showing an operation at the time of image retrieval by the optical disc recording / reproducing apparatus in FIG.

FIG. 4 is a block circuit diagram showing an optical disk recording / reproducing apparatus in a third embodiment.

FIG. 5 is a block circuit diagram showing an optical disc recording / reproducing apparatus in a fourth embodiment.

FIG. 6 is a block circuit diagram showing an optical disc recording / reproducing apparatus in Embodiment 5 of the present invention.

FIG. 7 is a flowchart showing an operation at the time of displaying a list image by the optical disc recording / reproducing apparatus according to the fifth embodiment.

FIG. 8 is a diagram of a list display image by the optical disc recording / reproducing apparatus in Example 5.

FIG. 9 is a diagram showing a format of an optical disc in Example 1 of the present invention.

FIG. 10 is a block circuit diagram showing a conventional optical disc recording / reproducing apparatus.

FIG. 11 is a diagram for explaining a data array structure of the MPEG system.

[Fig. 12] Fig. 12 is a diagram for describing a GOP encoding structure.

[Explanation of symbols]

1 A / D converter, 2 information compression means, 3 frame sector conversion means, 4 encoder, 5 modulator, 6 laser drive circuit, 8 optical head, 12 optical disk, 13
Reproduction amplifier, 14 demodulator, 15 decoder, 16 frame sector inverse conversion means, 17 information expansion means, 18
D / A converter, 20 control circuit, 21 address monitoring circuit, 22 and 25 header detection circuit, 23 address memory, 24, 26 and 27 switch, 28 low pass filter (LPF), 29 sub-sample circuit, 30 list image memory, 50 input video signal, 60 output video signal, 70 image selection signal, 80 list image display signal, 9
0 list image signal, 101 sequence header, 102,
1101 GOP, 103 GOP header, 104I1
Picture, 105 P4 picture, 106 B6 picture, 107 sequence header address, 108 GO
P header address, 109 B6 picture coded data start address, 110 selected image number sequence, 111 sequence header address sequence, 112 GOP header address sequence, 113 selected image start address sequence, 901 track, 902 sector, 903 video data area, 90
4 file management area, 905 image information table area.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04N 5/76-5/956 G11B 27/00 G11B 27/10

Claims (7)

(57) [Claims] 1. A and I-picture that is data-compressed within frame, and P-picture which is data-compressed with temporal motion compensation from the I picture, the temporally forward and backward directions of the I-picture or P-picture It shall be the one unit mixed and the B picture that is data-compressed with motion compensation from
In optical disc sequence or Ranaru digital video data is recorded in the video data area including the Film image information block
There are, the optical disc is composed of a sector, section of the sequence header at the head portion of the sequence
Image table information including address information corresponding to
An image information table which is an area different from the video data area.
Address information in the image information table , which is located in the
When making a selection, the selection screen is displayed and the sequence head
An optical disc, which is information for accessing a disk. 2. The selection screen, the digit
An image was selected by the user when recording video data
The optical disc according to claim 1, which is a disc. 3. I-picture compressed in a frame
And motion compensation by an I picture that is temporally forward.
Data-compressed P-pictures and temporally forward and backward
Add motion compensation by I picture or P picture of
Data-compressed B-pictures are mixed to form one unit
Digital consisting of a sequence containing video information blocks
Video data is a video of an optical disc composed of sectors
It is recorded in the data area, and the section of the sequence header at the beginning of the above sequence
Image table information including address information corresponding to
An image information table which is an area different from the video data area.
A method of recording an optical disc to be placed in the bull area, wherein the address information of the image information table is
It displays a selection screen when making a selection, the sequence header
Light, which is information for accessing Da
Disc recording method. 4. In the selection screen, the digital
An image was selected by the user when recording video data
An optical disc according to claim 3, characterized in that
Recording method. 5. I-picture data compressed in a frame
And motion compensation by an I picture that is temporally forward.
Data-compressed P-pictures and temporally forward and backward
Add motion compensation by I picture or P picture of
Data-compressed B-pictures are mixed to form one unit
Digital consisting of a sequence containing video information blocks
Video data is recorded in the video data area and the position of the sequence header at the beginning of the above sequence
Image table information including information is stored in the video data area.
Are placed in different areas of the image information table
A method of playing an optical disc, the method comprising: accessing the image table information of the optical disc.
Position information of the sequence header is extracted, and the selected image is displayed based on the position information of the sequence header.
Decoding , converting the selected image to a reduced image, extracting the position information, decoding the selected image, and reducing
Create a selection screen by repeating image conversion
A method for reproducing an optical disc, characterized in that 6. The above-mentioned digit is displayed on the selection screen.
An image was selected by the user when recording video data
An optical disc according to claim 5, characterized in that
How to play. 7. I-picture data compressed in a frame
And motion compensation by an I picture that is temporally forward.
Data-compressed P-pictures and temporally forward and backward
Add motion compensation by I picture or P picture of
Data-compressed B-pictures are mixed to form one unit
Digital consisting of a sequence containing video information blocks
Video data is recorded in the video data area and the position of the sequence header at the beginning of the above sequence
Image table information including information is stored in the video data area.
Was placed in the image information table region are different regions
A device for reproducing an optical disc, which accesses the image table information of the optical disc.
Means for extracting position information of sequence header by
And the selected image based on the position information of the sequence header
Decoding means, means for converting the selected image into a reduced image, extraction of the position information, decoding of the selected image, and reduction
Create a selection screen by repeating image conversion
And a device for reproducing an optical disc, comprising:
Place