JP4199780B2 - Optical disc reproducing apparatus and reproducing method - Google Patents

Description

  The present invention relates to an optical disc playback apparatus and playback method for playing back highly efficient encoded data recorded on an optical disc.

  FIG. 14 is a block circuit diagram of a conventional optical disc recording / reproducing apparatus disclosed in Japanese Patent Application Laid-Open No. 4-114369. 1 is an input analog video signal or audio signal (hereinafter referred to as “input image signal”), 2 is an A / D converter for converting the input image signal 1 into digital information, 3 is information compression means for compressing the digital information, and 4 is a frame sector conversion means for converting the compressed information into sector information equal to an integral multiple of the frame period. Reference numeral 5 denotes an encoder for converting into a disk format, 6 denotes a modulator for converting into a modulation code in order to reduce interference in a recording medium, 7 denotes a laser drive circuit for modulating a laser in accordance with the modulation code, and 8 denotes a laser output. A switch, 20 an optical head for emitting a laser, 21 an actuator for tracking a light beam emitted from the optical head 20, 22 Traverse motor for sending an optical head 20, 19 is a disk motor, 16 for rotating the optical disc 18 the motor drive circuit, 17 is a control circuit.

  Also, 9 is a reproduction amplifier that amplifies the reproduction signal reproduced by the optical head 20, 10 is a demodulator that demodulates the reproduced modulation signal, 11 is a decoder, 12 is a frame sector inverse conversion means, and 13 is inversely converted. Information decompression means for decompressing the compressed information, 14 is a D / A converter for converting the decompressed information into an analog video signal or audio signal, and 15 is an output image signal.

  FIG. 15 is a diagram showing an MPEG data arrangement structure (layer structure) that is being standardized to compress and transmit and store digital video signals. 121 is a GOP composed of a plurality of frame information, 122 is GOP layer composed of several pictures (screens), 123 is a slice obtained by dividing one screen into several blocks, 124 is a slice layer composed of several macroblocks (MB), 125 is several A macroblock layer 126 composed of blocks is a block layer composed of 8 pixels × 8 pixels.

  FIG. 16 is a diagram showing an encoding structure when 9 screens are set to 1 GOP. 131 is an I picture encoded in a frame, 132 is an I picture 131 or P picture, and forward motion compensation is performed. P-pictures 133 encoded from frame to frame are B pictures that are inter-frame encoded from motion compensation in both directions with reference to the I picture 131 and the P picture 132 that are positioned temporally forward and backward.

  Next, the operation of the conventional optical disc recording / reproducing apparatus will be described. In order to record a video signal having a large amount of information on a medium such as the optical disc 18, the information amount is generally compressed and then recorded. FIG. 14 shows a video signal recording / reproducing apparatus for recording a video signal on the optical disk 18 as described above. The video information digitized by the A / D converter 2 is, for example, information compression means 3 by a standard compression method such as MPEG. Compressed by The compressed information is encoded and modulated on the disk to reduce the influence of intersymbol interference and recorded on the optical disk 18. At this time, for example, the amount of data in each GOP unit is made substantially the same, and editing is made in GOP units by allocating to sectors equal to an integral multiple of the frame period.

  At the time of reproduction, the compressed video signal recorded on the optical disk 18 is reproduced by the optical head 20, amplified by the reproduction amplifier 9, and decoded into digital data by the demodulator 10 and the decoder 11. Thereafter, data such as address and parity is removed by the frame sector reverse conversion means 12 to obtain pure video compressed data, and this data is reproduced into a digital video signal by the information decompression means 13 by the MPEG decoding method, for example. It is converted into an analog image signal by the A converter 14 and displayed on a monitor or the like.

  Here, as described above, when the MPEG method is used as a digital video signal compression method, as shown in FIG. 16, an I picture 131 which is video information to be intra-frame encoded and a frame by forward motion compensation are used. A P picture 132 that is video information that is inter-coded, an I picture 131 that is positioned before and after in time, and a B picture 133 that is video information that is inter-frame coded using the P picture as a reference image. A continuous coding structure of GOPs is recorded on the optical disc 18.

  At this time, since the I picture 131 is intra-frame encoded, it is possible to reproduce an image using only the data of the I picture 131. However, since the P picture 132 is interframe-coded by forward motion compensation from the I picture 131 or the P picture 132, it cannot be played back after the I picture 131 or the P picture 132 is restored. Similarly, the B picture 133 is interframe-coded using the I picture 131 and the P picture 132 positioned before and after in time as a reference image, so that the B picture 133 is reproduced only after the I picture 131 or the P picture 132 is decoded. Can not.

JP-A-4-114369

  Since the coding structure recorded on the video disc is as described above, only I pictures can be decoded independently. Therefore, conventionally, images that can be searched when performing an image search or the like are limited to I pictures.

  Further, since the conventional video disk recording / playback apparatus or playback apparatus cannot identify the video disk being recorded or played back, the search image, playback start image, etc. corresponding to each video disk have not been known.

  The present invention has been made to solve the above-described problems. The first object is to search all the images of I picture, P picture, and B picture when searching for images on individual video discs. The object is to obtain a video disk recording / reproducing apparatus which can be searched at a high speed.

  A second object is to provide a video disk recording / reproducing apparatus capable of selecting a search image or the like from the video signal while recording the video signal or the like on a video disk or the like.

  A third object is to provide a video disk recording / reproducing apparatus capable of selecting a search image or the like as a selected image from the reproduced image during reproduction of a video signal recorded on a video disk or the like.

  A fourth object is to obtain a video disk recording / reproducing apparatus capable of reducing a plurality of images such as search images recorded on a video disk or the like on the display surface at the same time.

  A fifth object is to obtain a video disc playback apparatus that can search all I-picture, P-picture, and B-picture images at high speed when searching for images in individual video discs. .

  The sixth object is to obtain a video disk reproducing apparatus capable of selecting a search image or the like as a selected image from the reproduced images during reproduction of a video signal recorded on a video disk or the like. is there.

  A seventh object is to obtain a video disk reproducing apparatus capable of reducing and simultaneously displaying a plurality of images recorded on a video disk or the like on a display surface.

An optical disc reproducing apparatus according to the present invention includes an I picture compressed in a frame, a P picture compressed by adding motion compensation by a temporally forward I picture, and an temporally forward and backward I picture Alternatively, in an optical disc playback apparatus for playing back an optical disc including a video information block in which a B picture compressed by adding motion compensation by a P picture is mixed, and having a video information sequence having header information at the head,
A memory for storing an image information table including an address of sequence header information at the head of a video information sequence designated in advance and number sequence information corresponding to each address of the sequence header information;
When reproducing the optical disc, the video information of the designated video information sequence is decoded by accessing the address of the sequence header information obtained by reading the table information, and a list image display for image selection is displayed. To do.

  Since the present invention is configured as described above, search images and the like can be arbitrarily set. In addition, an image such as a search image can be selected from the images being reproduced.

Example 1.
FIG. 1 is a block circuit diagram showing a video disk recording / reproducing apparatus according to a first embodiment of the present invention. The same reference numerals as those in FIG. 14 denote the same or corresponding parts. The start address of the encoded data of the selected image, the start address of the data including information necessary for decoding the encoded data, and the ID signal for identifying the optical disk 18 generated by the ID signal generation circuit 24 are stored. . Reference numeral 25 denotes a switch that is operated when the ID signal generated by the ID signal generation circuit 24 is recorded on the optical disc 18 at an appropriate time desired by the user, for example.

  Next, the operation will be described. High-efficiency encoded data of an image having a GOP structure is recorded on the optical disk 18. A GOP header including information necessary for decoding each GOP is added to the head of each GOP. In some cases, a sequence header including information related to the sequence may be added to the head of a sequence including a plurality of GOPs.

  In order to reproduce the optical disk 18, the compressed video signal recorded on the optical disk 18 is reproduced by the optical head 20, amplified by the reproduction amplifier 9, and the digital data is restored by the demodulator 10 and the decoder 11. Then, for example, the digital video signal is restored by the information decompression means 13 using the MPEG decoding method, the analog output image signal 15 is obtained by the D / A converter 14 and displayed on the monitor or the like.

  In the information table memory 23, the ID signal generated by the ID signal generation circuit 24 for identifying the optical disc 18, the head address on the disc of the encoded data of the selected image such as the search image on the optical disc 18, and the encoding The start address of data including information necessary for reproducing data, that is, the start address of the GOP header of the GOP including the encoded data, the start address of the sequence header related to the sequence including the GOP, and the like are stored. In some cases, data relating to selected images of a plurality of optical disks is also stored. Of course, the data ID signals in this case are different.

  A schematic diagram of the table thus stored in the information table memory is shown in FIG.

  Then, the ID signal generated by the ID signal generation circuit 24 is recorded on a specific portion of the optical disc 18 by operating the switch 25 at a time desired by the user, for example.

  Thus, by using the ID signal recorded in the specific part of the optical disc 18 and the information table memory 23 in the apparatus, it is possible to search for and display an arbitrary selected image on the optical disc 18. The reason for this will be described in detail with reference to FIG.

  FIG. 2A is a diagram showing an encoded data structure recorded on the optical disc 18, wherein 101 is a sequence header, 102 is a GOP, and 103 is a GOP header. Reference numeral 107 denotes a start address of the sequence header 101, 108 denotes a start address of the GOP header 103, and 109 denotes a start address of the B6 picture.

  FIG. 2B is a diagram showing an outline of the table recorded in the information table memory 23 in the apparatus. 110 is a column in which an ID signal for identifying the video disk 18 is written, 111 is each selection related to the ID signal. A column for writing the selected image number attached to the image, 112 is a column for writing the address of the sequence header relating to the sequence including the selected image, 113 is a column for writing the address of the GOP header of the GOP including the selected image, and 114 is the code of the selected image This is a column for writing the start address of the digitized data.

  As described above, some of the input images are collectively referred to as a GOP (Group of Picture) 102, which includes the following pictures. That is, an I picture that is encoded within a frame, a P picture that is inter-frame encoded from forward motion compensation, and a B picture that is inter-frame encoded from forward / backward motion compensation. Image information composed of a series of these GOPs 102 is subjected to high-efficiency encoding. At this time, a GOP header 103 indicating information for decoding the GOP 102 is added to encoded data in GOP units. Further, a group of GOPs 102 is called a sequence, and a sequence header 101 describing information such as the screen size of the sequence is added to the head of the sequence. Encoded data composed of such data is recorded on the optical disk 18 to which an address is assigned.

  At the time of reproduction, the video signal recorded on the optical disk 18 is reproduced and displayed by performing the reverse procedure of the recording procedure.

Here, for example, the B6 picture 106 is set as the selected image. In order to decode the B6 picture 106, it is necessary to decode the I1 picture 104 and the P4 picture 105, and in order to decode the P4 picture 105, it is necessary to decode the I1 picture 104. Since the information for decoding is described in the GOP header 103, the information in the GOP header 103 is required. Normally, there is only one I picture in the GOP 102, and there is an I picture after the GOP header 103. Therefore, in order to display the B6 picture as the selected image, the GOP 102 including the B6 picture 106 is displayed as the GOP header. What is necessary is to read from 103 and decode in order of I1 picture, B2 picture, B3 picture, and finally decode and display the B6 picture 106. For this purpose, the start address 109 on the optical disk 18 in which the encoded data of the B6 picture 106 is recorded and the start address 108 of the GOP header 103 of the GOP 102 including the B6 picture 106 are required.
Further, since the information of the sequence header 101 necessary for decoding the B6 picture 106 may be necessary, the sequence header address 107 is also necessary. Such address information is stored in the information table memory 23 of the apparatus.

  Further, an ID signal for identifying the optical disk 18 is stored in the information table memory 23. For example, at an appropriate time desired by the user, the switch 25 is operated, and the ID signal is recorded in a specific part of the optical disk 18. Keep it.

  The information table memory 23 may also store data related to different ID signals.

  With the video disc recording / reproducing apparatus configured as described above, any selected image can be searched and displayed according to each optical disc. For this purpose, the operation shown in the flowchart of FIG. 3 is performed.

  First, when a search command is instructed by the user and the search operation is started, the ID signal recorded in the specific part of the optical disc 18 is read (step 1). Then, the sequence header address, GOP header address, selected image head address, etc. corresponding to the read ID signal are read from the information table memory 23 in the apparatus (step 2), jumped to the corresponding sequence header, GOP header, and written there. The obtained information is obtained (step 3) (step 4). Then, decoding is performed in order from the first picture of this GOP (step 5), and when decoding of the selected image is completed (step 6), a decoding screen of the selected image is displayed (step 7). Then, step 3 to step 7 are repeated until a search end command is issued in step 8 to complete the search operation.

  By the way, the first B picture of B2 and B3 in the GOP 102 in FIG. 2A must be decoded using the last I picture or P picture of the previous GOP. It is made there. In order to prevent this, it is necessary to give information indicating that such a B picture is decoded by backward compensation to the GOP header 103. That is, in this case, the prediction is made only from I1.

Example 2
4 is a block circuit diagram showing a video disk recording / reproducing apparatus according to Embodiment 2 of the present invention. The same reference numerals as those in FIG. 1 denote the same or corresponding parts, respectively. An address monitoring circuit for associating addresses, 27 is a header detection circuit for detecting a GOP header or sequence header in the bit stream of encoded data, and 35 is an image selection signal indicating that a selected image such as a search image has been selected. is there.

  Next, operations of parts different from the first embodiment will be described. The input image signal 1 having the GOP structure described above is converted into a digital signal by the A / D converter 2 and converted into a highly efficient encoded image information signal by the information compression means 3. At that time, a GOP header including information necessary for decoding each GOP is added to the head of each GOP, and information about the sequence is also included in the head of a sequence including a plurality of GOPs. A sequence header is added.

  The image information is encoded for recording on the optical disk 18, and after being modulated on the optical disk to reduce the influence of intersymbol interference, the image information is recorded on the optical disk 18 using a laser.

  The GOP header and the sequence header include unique words that are information for identifying each, and the header detection circuit 27 can detect and determine various headers by detecting them.

  The address monitoring circuit 26 monitors at which address on the optical disk 18 the encoded data corresponding to the image is recorded. The address monitored by the address monitoring circuit 26 and the header detection circuit 27 From the detected header, the address where the latest GOP header and sequence header are recorded can be known, and the address is stored in the information table memory 23.

Further, when a selected image is selected from the input image signal 1, an image selection signal 35 indicating that this image has been selected and a signal from the address monitoring circuit 26 are used to generate a code corresponding to the selected image. The address where the digitized data is recorded can be known, and this address is stored in the information table memory 23.
The ID signal generation circuit 24 generates an ID signal for identifying the optical disk 18 and stores this ID signal in the information table memory 23.

  The outline of the table stored in the information table memory 23 in this way is as shown in FIG.

  Furthermore, this ID signal is recorded in the specific part of the optical disk 18 by operating the switch 25 at a time point desired by the user, for example.

  By using the ID signal thus recorded on the optical disk 18 and the address of the selected image stored in the information table memory 23 in the apparatus, the optical disk 18 is subjected to the same procedure as described in the first embodiment. Any selected recorded image can be searched and displayed.

  The operation for searching for and displaying the selected image is the same as the flowchart shown in FIG.

Example 3
FIG. 5 is a block circuit diagram showing a video disk recording / reproducing apparatus according to a third embodiment of the present invention. The same reference numerals as those in FIG. 4 denote the same or corresponding parts, and the header detection circuit 27 is reproduced from the optical disk 18. The difference from the second embodiment is that a GOP header and a sequence header in a bit stream of encoded data are detected.

Next, operations of parts different from the second embodiment will be described.
The header detection circuit 27 detects the GOP header and sequence header of the video data decoded by the decoder 11, and the address monitoring circuit 26 indicates at which address on the optical disc 18 the encoded data corresponding to the image is recorded. Is monitoring.

  Using the address monitoring circuit 26 and the header detection circuit 27, the address where the latest GOP header and sequence header are recorded can be known, and the address is stored in the information table memory 23.

  When a desired image is selected from the output image signal 15, an image selection signal 35 indicating that this image has been selected is input to the address monitoring circuit 26, and the encoded data of the selected image is recorded. The address can be known, and the address is stored in the information table memory 23.

  The outline of the table stored in the information table memory 23 in this way is as shown in FIG.

  Further, the ID signal is recorded in a specific part of the optical disc 18 by operating the switch 25 at a time desired by the user, for example.

  Thus, by using the ID signal recorded on the optical disk 18 and the address of the selected image stored in the information table memory 23 in the apparatus, the optical disk 18 can be arbitrarily set in the same procedure as described in the first embodiment. The selected image can be searched and displayed.

  The operation for searching and displaying the selected image is the same as that in the flowchart shown in FIG.

Example 4
FIG. 6 is a block circuit diagram showing a video disk recording / reproducing apparatus according to a fourth embodiment of the present invention. The same reference numerals as those in FIG. 1 denote the same or corresponding parts, respectively, and 28 denotes a normal reproduction and a list display A switch for switching processing, 29 is a low-pass filter (LPF) necessary for reducing the expanded image data, 30 is a sub-sample circuit, 31 is a list image memory for storing a list display screen, and 32 is recorded in the list image memory 31 It is a switch operated when displaying the displayed list display image.

Next, operations of parts different from the first embodiment will be described. The operation during recording is the same as in the first embodiment.
At the time of reproduction, by using the ID signal recorded on the optical disc 18 and the information table memory 23 in the apparatus, a list of arbitrary selected images recorded on the optical disc 18 can be displayed. You can know quickly.

Next, the operation for displaying a list of the selected images will be described with reference to the flowchart of FIG.
First, when the list display is instructed and the list display operation is started, the operation from reading the ID signal recorded in the specific part of the optical disc 18 in step 1 to ending the decoding of the picture of the selected image in step 6 is as follows. This is the same as FIG. Next, in step 11, the switch 28 is switched to the LPF 29 side to remove high-frequency components to prepare for later processing, and then subsampled to 1 / N by the subsample circuit 30 and reduced by 1 / N. A process for converting the image into a reduced image is performed. Next, this reduced image is stored in the list image memory 31 (step 12).

  By repeating these series of operations (step 13), a list image composed of reduced screens of N selected images recorded in the disc is stored in the list image memory 31. Then, by operating the switch 32 in step 14, the list image stored in the list image memory 31 in FIG. 8 can be displayed, so that the contents recorded on the optical disk 18 can be easily known.

Example 5 FIG.
FIG. 9 is a block circuit diagram showing a video disk reproducing apparatus according to the fifth embodiment of the present invention. In FIG. 9, the same reference numerals as those in FIG. An ID signal detection circuit for generating an ID signal by detecting and using a bit string such as a signal; 34 is switched between normal reproduction and when the ID signal is generated from a bit string of a specific part of the video disk 18 by the ID signal detection circuit 33 Switch.

  Next, portions of the fifth embodiment that are different from the operation during reproduction of the first embodiment will be described. Usually, since the video signals and the like recorded on each optical disc are different, the bit string recorded on the specific portion of the optical disc differs depending on the disc. The ID signal detection circuit 33 generates an ID signal for identifying the optical disk 18 from a bit string such as a video signal recorded in a specific part of the optical disk.

  Next, an operation for retrieving and displaying an arbitrary selected image from images recorded on individual optical disks will be described.

  FIG. 10 is a flowchart of this operation. First, when a search is instructed, the switch 34 is switched to the ID signal detection circuit 33 side in step 21. The ID signal detection circuit 33 detects a bit string recorded in the specific part of the optical disc 18 and generates an ID signal using the bit string. Next, in step 2, the sequence header address, GOP header address, selected image head address, etc. corresponding to the ID signal generated in step 21 are read from the information table memory 23 in the apparatus, and the corresponding sequence header is accessed in step 3. In step 4, the GOP header is accessed to obtain information written therein. Then, in step 5, the switch 34 is switched to the information decompression means 13 side, and decoding is started in order from the first picture of the GOP. When decoding of the selected image is completed in step 6, a decoding screen of the selected image is displayed in step 7. In Step 8, when the search is completed by repeating the operations from Step 3 to Step 7, the operation is terminated.

Example 6
FIG. 11 is a block circuit diagram showing a video disk reproducing apparatus according to Embodiment 6 of the present invention. The same reference numerals as those in FIGS. 4 and 9 denote the same or corresponding parts, respectively.

  Next, portions of the fifth embodiment that are different from the operation during reproduction of the first embodiment will be described. Each of the various headers described above includes a unique word that is information for identifying each of the headers, and various headers can be detected and determined by detecting the unique word. The header detection circuit 27 detects a GOP header and a sequence header using this method.

  An address for specifying a location is assigned on the optical disc 18 in advance, and the address monitoring circuit 26 monitors at which address on the optical disc 18 the encoded data corresponding to the image is recorded.

  Using this address monitoring circuit 26 and the header detection circuit 27, the address where the latest GOP header and sequence header are recorded can be known, and the address is stored in the information table memory 23.

  When the selected image is selected from the output image signals 15, the address where the encoded data of the selected image is recorded is known from the image selection signal 35 indicating that the image has been selected and the signal from the address monitoring circuit 26. The address is stored in the information table memory 23.

  Further, when the switch 34 is operated, the ID signal detection circuit 33 generates an ID signal for identifying the optical disk 18 from a bit string recorded in the specific part of the optical disk 18, and this ID signal is also stored in the information table. Store in the memory 23.

  A schematic diagram of the table thus stored in the information table memory is shown in FIG.

  In order to search for and display an arbitrary selected image recorded on the optical disc 18 by the video disc reproducing apparatus configured as described above, the following operation may be performed. First, when a search is started, the switch 34 is operated to detect a bit string recorded in a specific part of the optical disk 18 and generate an ID signal using it. Then, the sequence header address, GOP header address, selected image head address, etc. corresponding to the generated ID signal are read from the information table memory 23 in the apparatus, jumped to the corresponding sequence header, GOP header, and the information written there obtain. Then, when decoding is performed in order from the first picture of the GOP and decoding of the selected image is completed, a decoding screen of the selected image is displayed. The flowchart of these series of operations is the same as that in FIG.

Example 7
FIG. 12 is a block circuit diagram showing a video disk recording / reproducing apparatus according to Embodiment 7 of the present invention. The same reference numerals as those in FIGS. 6 and 9 denote the same or corresponding parts, respectively.

  Next, the operation will be described. High-efficiency encoded data of an image having a GOP structure is recorded on the optical disk 18. A GOP header including information necessary for decoding each GOP is added to the head of each GOP. In some cases, a sequence header including information related to the sequence may be added to the head of a sequence including a plurality of GOPs.

In order to reproduce the optical disk 18, the compressed video signal recorded on the optical disk 18 is amplified by the reproduction amplifier 9, and the demodulator 10 and the decoder 11 decode the digital data.
Then, for example, the digital video signal is decoded by the information decompression means 13 by the MPEG decoding method, and the analog output image signal 15 is obtained by the D / A converter 14 and displayed on the monitor or the like.

  Usually, since the video signals and the like recorded on each optical disc are different, the bit string recorded on the specific portion of the optical disc differs depending on the disc. Utilizing this fact, the ID signal detection circuit 33 generates an ID signal for identifying the optical disk 18 from a bit string such as a video signal recorded in the specific unit.

  The information table memory 23 also includes an ID signal generated by the ID signal detection circuit 33 for identifying the optical disc 18, a head address on the disc of encoded data of a selected image such as a search image on the optical disc 18, and the like. The start address of data including information necessary for reproducing the encoded data, that is, the start address of the GOP header of the GOP including the encoded data, the start address of the sequence header related to the sequence including the GOP, and the like are stored. Yes.

  Note that data related to a selected image on an optical disc different from the optical disc 18 may also be stored in the information table. Of course, the data ID signal in this case differs depending on the optical disk 18.

  A schematic diagram of the table thus stored in the information table memory is shown in FIG.

  Using these, a list of arbitrary selected images recorded on the optical disk 18 can be displayed, and the recorded contents of the optical disk 18 can be quickly known. FIG. 13 is a flowchart showing the operation when the selected images are displayed as a list.

  First, the list display operation is started, and when the user operates the switch 34, in step 31, the ID signal detection circuit 33 generates an ID signal using the bit string recorded in the specific part of the optical disc 18. In step 2, the sequence header address, GOP address, selected image head address, etc. corresponding to the ID signal generated in step 31 are read from the information table memory 23 in the apparatus.

  Based on these, the sequence header is accessed in step 3 to obtain sequence information. Then, the GOP header is accessed in step 4, decoding is started from the first picture of the GOP in step 5, decoding of the picture of the selected image is completed in step 6, the switch 28 is operated, and reduction is performed in step 11. Processing to convert to an image is performed. Therefore, in order to prepare for later processing, the high-frequency component is removed by the low-pass filter 29. Thereafter, the subsample circuit 30 subsamples to 1 / N to obtain a 1 / N reduced image, which is stored in the list image memory 31 in step 12.

  By repeating these series of operations, the list image memory 31 stores a list image composed of reduced screens of N selected images recorded in the disc (step 13). FIG. 8 shows a list image stored in the list image memory. Then, by operating the switch 32 in step 14 and displaying a list image, the contents recorded on the optical disk 18 can be easily known.

  In each of the above-described embodiments, an example in which the selected image is mainly a search image has been described. is there.

1 is a block circuit diagram showing a video disk recording / reproducing apparatus according to an embodiment of the present invention. FIG. 6 is a diagram for explaining the operation of the first embodiment. It is a flowchart which shows the operation | movement at the time of the image search of Example 1, Example 2, and Example 3 of this invention. It is a block circuit diagram which shows the video disc recording / reproducing apparatus of Example 2 of this invention. It is a block circuit diagram which shows the video disc recording / reproducing apparatus of Example 3 of this invention. It is a block circuit diagram which shows the video disc recording / reproducing apparatus of Example 4 of this invention. 14 is a flowchart illustrating an operation when displaying a list image according to the fourth embodiment. It is a figure which shows the list display image of Example 4 and Example 7. FIG. It is a block circuit diagram which shows the video disk reproducing | regenerating apparatus of Example 5 of this invention. 10 is a flowchart illustrating an operation at the time of image search according to a fifth embodiment and a sixth embodiment. It is a block circuit diagram which shows the video disk reproducing | regenerating apparatus of Example 6 of this invention. It is a block circuit diagram which shows the video disk reproducing | regenerating apparatus of Example 7 of this invention. 18 is a flowchart illustrating an operation when displaying a list image according to the seventh embodiment. It is a block circuit diagram which shows the conventional optical disk recording / reproducing apparatus. It is a figure for demonstrating the data arrangement | sequence structure of an MPEG system. It is a figure for demonstrating the encoding structure of GOP.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input image signal, 2 A / D converter, 3 Information compression means, 5 Encoder, 6 Modulator, 7 Laser drive circuit, 9 Reproduction amplifier, 10 Demodulator, 11 Decoder, 13 Information expansion means, 14 D / A conversion 15 output image signal, 16 motor drive circuit, 17 control circuit, 18 optical disk, 19 disk motor, 20 optical head, 21 actuator, 22 traverse motor, 23 information table memory, 24 ID signal generation circuit, 25, 28, 32 , 34 switch, 26 address monitoring circuit, 27 header detection circuit, 29 low-pass filter (LPF), 30 subsample circuit, 31 list image memory, 33 ID signal detection circuit, 35 image selection signal, 101 sequence header, 102, 121 GOP , 103 GOP header, 104 I1 pin , 105 P4 picture, 106 B6 picture, 107 sequence header address, 108 GOP header address, 109 B6 picture encoded data head address, 110 ID signal string, 111 selected image number string, 112 sequence header head address string, 113 GOP header Start address string, 114 selected image start address string, 122 GOP layer, 123 slice, 124 slice layer, 125 macroblock layer, 126 block layer, 131 I picture, 132 P picture, 133 B picture.

Claims (6)

In addition to the I picture compressed in the frame, the P picture compressed by adding the motion compensation by the forward I picture in time, and the motion compensation by the I picture or the P picture in the forward and backward direction In an optical disc playback apparatus for playing back an optical disc including a video information block including a video information block mixed with data-compressed B pictures and having header information at the head,
A memory for storing an image information table including an address of sequence header information at the head of a video information sequence designated in advance and number sequence information corresponding to each address of the sequence header information;
During playback of the optical disc, by sequentially accessing the address of the sequence header information obtained by reading the table information according to the number sequence information, the video information of the designated video information sequence is decoded and a reduced screen display is performed. by performing, optical disk reproducing apparatus, characterized in that to perform the list image display for image selection. The memory further stores ID information that is given to the image information table information and identifies the optical disc,
2. The optical disc reproducing apparatus according to claim 1, wherein when reproducing the optical disc, the ID information is read and an address of a sequence header of the table information is accessed.   2. The optical disk reproducing apparatus according to claim 1, wherein a list image composed of N selected images (N ≧ 1) is displayed. In addition to the I picture compressed in the frame, the P picture compressed by adding the motion compensation by the forward I picture in time, and the motion compensation by the I picture or the P picture in the forward and backward direction In an optical disc reproducing method for reproducing an optical disc including a video information block including a video information block mixed with a data-compressed B picture and having header information at the head,
An image information table including an address of sequence header information at the head of a video information sequence designated in advance and number sequence information corresponding to each address of the sequence header information is stored in the memory of the playback device of the optical disc,
During playback of the optical disc, by sequentially accessing the address of the sequence header information obtained by reading the table information according to the number sequence information, the video information of the designated video information sequence is decoded and a reduced screen display is performed. A method of reproducing an optical disc, characterized in that a list image display for image selection is performed . ID information for identifying the optical disc, which is given to the image information table information, is further stored in the memory;
5. The optical disc reproducing method according to claim 4, wherein when reproducing the optical disc, the ID information is read and an address of a sequence header of the table information is accessed. 5. The optical disk reproducing method according to claim 4, wherein a list image composed of N selected images (N ≧ 1) is displayed.

Images