JP2004215291A - Recording method and reproducing method of video disc - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording method and a reproducing method of a video disc capable of high speed searching regardless of the type of search images such as an I picture, a P picture and a B picture, in a video disc recording/reproducing device which performs high efficiency compression coding to a digital image signal and records and reproduces the signal on the video disc. <P>SOLUTION: A sequence including multiple image information blocks (GOP) which mixedly comprise the I pictures and the P pictures and the B pictures in a unit are recorded on a video disc. A header address at the top of the sequence and an ID signal for identifying the video disc are also recorded on the video disc. The header address is the information for a user to select the image and access the top of the sequence including the selected image. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a video disk recording / reproducing apparatus for converting a digital video signal into high-efficiency coded data, recording the data on a video disk, and reproducing the high-efficiency coded data recorded on the video disk, and a video disk reproducing apparatus. .

  FIG. 14 is a block circuit diagram of a conventional optical disk recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 4-114369, wherein 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 an information compressing means for compressing digital information, and 4 is a frame sector converting means for converting compressed information into sector information equal to an integral multiple of a frame period. Reference numeral 5 denotes an encoder for converting to a format for a disk, 6 denotes a modulator for converting to a modulation code in order to reduce interference in a recording medium, 7 denotes a laser drive circuit for modulating a laser according to the modulation code, and 8 denotes a laser output. Switch, 20 is an optical head for emitting a laser, 21 is 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.

  Reference numeral 9 denotes a reproduction amplifier for amplifying a reproduction signal reproduced by the optical head 20; 10 a demodulator for demodulating the reproduced modulation signal; 11 a decoder; 12 a frame sector reverse conversion means; An information decompression means for decompressing the compressed information, a D / A converter 14 for converting the decompressed information into an analog video signal or an audio signal, and 15 an output image signal.

  FIG. 15 is a diagram showing a data array structure (layer structure) of the MPEG system, which is being standardized for compressing, transmitting, and storing digital video signals, wherein 121 is a GOP composed of a plurality of pieces of frame information, and 122 is A 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), and 125 is several slices. A macro block layer 126 composed of blocks is a block layer composed of 8 × 8 pixels.

  FIG. 16 is a diagram showing an encoding structure when nine screens are formed as one GOP. Reference numeral 131 denotes an I picture to be encoded in a frame, 132 denotes a motion compensation in the forward direction with reference to the I picture 131 or the P picture. Are inter-coded P-pictures 133 are B-pictures inter-coded by motion compensation in both directions with reference to the I picture 131 and the P picture 132 located temporally before and after.

  Next, the operation of the conventional optical disk 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 disk 18, it is general to record the information after compressing the amount of information. 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 converted into information compression means 3 by a standard compression method such as MPEG. Compressed. This compressed information is encoded, modulated on the disc to reduce the effect of intersymbol interference, and recorded on the optical disc 18. At this time, for example, the data amount in each GOP unit is set to be substantially the same, and the data is divided into sectors equal to an integral multiple of the frame period, thereby enabling editing in GOP units.

  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, the data such as the address and the parity is removed by the frame sector reverse conversion means 12 to obtain pure video compression data, and this data is reproduced into a digital video signal by the information decompression means 13 using, for example, the MPEG decoding method. The signal 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 system is used as the digital video signal compression method, as shown in FIG. 16, an I picture 131 which is video information to be intra-coded, and a frame by forward motion compensation A P picture 132 which is video information to be inter-coded, an I picture 131 located before and after in time, and a B picture 133 which is video information to be inter-coded using the P picture as a reference image. The continuous coding structure of the GOP is recorded on the optical disk 18.

  At this time, since the I picture 131 is intra-frame coded, it is possible to reproduce an image using only the data of the I picture 131. However, since the P picture 132 is inter-frame coded by forward motion compensation from the I picture 131 or the P picture 132, it cannot be reproduced unless the I picture 131 or the P picture 132 is restored. Similarly, since the B picture 133 is inter-coded using the I picture 131 and the P picture 132 located before and after in time as reference images, 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 disk is as described above, only I pictures can be decoded alone. Therefore, conventionally, images that can be searched when performing image search or the like have been limited to I-pictures.

  Further, since the conventional video disk recording / reproducing apparatus or the reproducing apparatus cannot identify the video disk that is recording or reproducing, the search image or the reproduction start image corresponding to each video disk cannot be known.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is to search for an image of an individual video disc, and to convert all the images of an I picture, a P picture, and a B picture. An object of the present invention is to obtain a video disk recording / reproducing apparatus which can search at a high speed.

  A second object of the present invention 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 which can select a search image or the like as a selected image from the reproduced images while reproducing a video signal recorded on a video disk or the like.

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

  A fifth object is to provide a video disc reproducing apparatus capable of searching for an I picture, a P picture, and a B picture at a high speed when searching for an image in an individual video disc. .

  A sixth object is to provide a video disc 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 disc or the like. is there.

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

  In the video disk recording / reproducing apparatus according to the first aspect of the present invention, the digital video signal is inter-frame coded from forward motion compensation with reference to the I picture coded in the frame, the I picture and the P picture. This is a series of video signals in units of several frames in which P pictures and B pictures that are inter-coded by motion compensation in both directions with reference to the I and P pictures located in front and behind are mixed. The video signal is converted into high-efficiency encoded data and recorded on a video disk, and the high-efficiency encoded data recorded on the video disk is restored to reproduce an output image. Means for storing a start address of encoded data of a selected image such as a search image, a start address of data including information necessary for reproducing the encoded data, and an ID signal for identifying the video disc; And means for recording the ID signal in a specific portion of the video disk.

  According to a second aspect of the present invention, there is provided a video disk recording / reproducing apparatus according to the first aspect, further comprising means for selecting an image being recorded on the video disk as a selected image.

  According to a third aspect of the present invention, in the video disk recording / reproducing apparatus according to the first aspect, an image being output after decoding encoded data recorded on the video disk is selected as a selected image. It is provided with means for performing.

  According to a fourth aspect of the present invention, in the video disk recording / reproducing apparatus according to the first aspect, means for performing low-pass filter processing on the decoded selected image, and sub-samples the filtered image Means for storing the sub-sampled image and displaying it on a display device as a small screen obtained by dividing one screen into N (N ≧ 1).

  6. A video disk reproducing apparatus according to claim 5, wherein: a start address of encoded data of a selected image such as a search image; a start address of data including information necessary for reproducing the encoded data; The video recording apparatus further comprises means for storing an ID signal for identifying a disc, and means for obtaining the ID signal from a bit string recorded in a specific portion of the video disc.

  According to a sixth aspect of the present invention, in the video disk reproducing apparatus according to the fifth aspect, means for decoding encoded data recorded on the video disk and selecting an image being output as a selected image is provided. It is provided with.

  A video disk reproducing apparatus according to a seventh aspect of the present invention is the video disk reproducing apparatus according to the fifth aspect, wherein low-pass filtering is performed on the decoded selected image, and sub-sampling is performed on the filtered image. And means for storing the sub-sampled image and displaying it on the display device as a small screen obtained by dividing one screen into N (N ≧ 1).

  The present invention is configured as described above, and has the following effects.

  According to the first aspect of the present invention, a search image or the like can be arbitrarily set.

  According to the invention of claim 2, it is possible to select an image such as a search image from the images being recorded on the video disk.

  According to the invention of claim 3, it is possible to select an image such as a search image from the images being reproduced from the video disk.

  According to the fourth aspect of the present invention, it is possible to simplify the content judgment and the search operation of the video disc.

  According to the invention of claim 5, a search image or the like can be arbitrarily set.

  According to the invention of claim 6, it is possible to select an image such as a search image from the images being reproduced from the video disk.

  According to the invention of claim 7, it is possible to simplify the content judgment and the search operation of the video disc.

  In the video disk recording / reproducing apparatus according to the first aspect of the present invention, a head address of encoded data of a selected image such as a search image, a head address of data including information necessary for reproducing the encoded data, By storing an ID signal for identifying the video disc and recording the ID signal in a specific portion of the video disc, it is possible to search for all I picture, P picture, and B picture images.

  In the video disk recording / reproducing apparatus according to the second aspect of the present invention, an image being recorded on the video disk can be selected as a selected image.

  In the video disk recording / reproducing apparatus according to the third aspect of the present invention, the image being decoded and output on the encoded data recorded on the video disk can be selected as a selected image such as a search image.

  In the video disk recording / reproducing apparatus according to the fourth aspect, an arbitrary number of selected images recorded on the video disk can be simultaneously displayed on a small screen obtained by dividing one screen into N (N ≧ 1).

  In the video disk reproducing apparatus according to the fifth aspect of the present invention, the head address of encoded data of a selected image such as a search image, the head address of data including information necessary for reproducing the encoded data, By storing an ID signal for identifying a video disc and obtaining the ID signal from a bit string recorded in a specific portion of the video disc, it is possible to search for all I-picture, P-picture, and B-picture images. .

  In the video disk reproducing apparatus according to the sixth aspect of the present invention, it is possible to decode the encoded data recorded on the video disk and select an image being output as a selected image such as a search image.

  In the video disk reproducing apparatus according to the seventh aspect, an arbitrary number of selected images recorded on the video disk can be simultaneously displayed on a small screen obtained by dividing one screen into N (N ≧ 1).

Embodiment 1 FIG.
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 head address of encoded data of the selected image, the head address of data including information necessary for decoding the encoded data, and an ID signal generated by the ID signal generation circuit 24 for identifying the optical disk 18 are stored. . Reference numeral 25 denotes a switch operated when recording an ID signal generated by the ID signal generation circuit 24 on the optical disk 18 at an appropriate time desired by a user, for example.

  Next, the operation will be described. The optical disk 18 records highly efficient encoded data of an image having a GOP structure. At the head of each GOP, a GOP header including information necessary for decoding each GOP is added. In some cases, a sequence header including information on the sequence is added to the beginning of a sequence including a plurality of GOPs.

  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 restored by the demodulator 10 and the decoder 11 to digital data. For example, the digital video signal is restored by the information decompression means 13 using the MPEG decoding method, and the analog output image signal 15 and the like are obtained by the D / A converter 14 and displayed on a monitor or the like.

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

  FIG. 2B is a schematic diagram of a table stored in the information table memory in this manner.

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

  As described above, by using the ID signal recorded in the specific portion 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 will be described in detail with reference to FIG.

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

  FIG. 2B is a diagram schematically showing a table recorded in an information table memory 23 in the apparatus. Reference numeral 110 denotes a column in which an ID signal for identifying the video disk 18 is written, and reference numeral 111 denotes each selection relating to the ID signal. A column for writing the selected image number assigned to the image, 112 is a column for writing the address of the sequence header related 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 a code of the selected image. This is a column in which the head address of the encrypted data is written.

As described above, some of the input images are collectively referred to as a GOP (Group of Picture) 102, and include the following pictures. That is, there are an I picture coded in a frame, a P picture coded by inter-frame coding based on forward motion compensation, and a B picture coded by inter-frame coding based on forward / backward motion compensation. The image information composed of a series of these GOPs 102 is encoded with high efficiency. At this time, a GOP header 103 indicating information for decoding the GOP 102 is added to the 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 beginning of the sequence. Coded data composed of such data is recorded on the optical disk 18 to which addresses are 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 a selected image. To decode the B6 picture 106, it is necessary to decode the I1 picture 104 and the P4 picture 105, and to decode the P4 picture 105, it is necessary to decode the I1 picture 104. Since 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 must be 103, I1 picture, B2 picture, B3 picture... Are decoded in this order, and finally B6 picture 106 is decoded and displayed. For this purpose, a start address 109 on the optical disc 18 where the encoded data of the B6 picture 106 is recorded and a start address 108 of the GOP header 103 of the GOP 102 including the B6 picture 106 are required. In some cases, the information of the sequence header 101 necessary for decoding the B6 picture 106 is also required, so the sequence header address 107 is also required. These pieces of address information are stored in the information table memory 23 of the device.

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

  Note that the information table memory 23 may also store data relating to different ID signals.

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

  First, when a search command is issued by a user and a search operation is started, an ID signal recorded on a specific portion of the optical disk 18 is read (step 1). Then, a sequence header address, a GOP header address, a selected image head address, and the like corresponding to the read ID signal are read from the information table memory 23 in the apparatus (step 2), and jump to the corresponding sequence header and GOP header and write there. Obtained information is obtained (step 3) (step 4). Then, decoding is performed in order from the top picture of this GOP (step 5). 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 there is a search end command in Step 8, and the search operation is ended.

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

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

  Next, an operation of a portion different from the first embodiment will be described. The input image signal 1 having the above-mentioned GOP structure is converted into a digital signal by the A / D converter 2, and is converted into a highly efficient coded image information signal by the information compression means 3. At this time, a GOP header including information necessary for decoding each GOP is added to the head of each GOP, and information related to the sequence is also included at the head of a sequence including a plurality of GOPs. Is added.

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

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

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

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

  An outline of the table stored in the information table memory 23 in this manner is as shown in FIG.

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

By utilizing the ID signal recorded on the optical disk 18 in this way and the address of the selected image stored in the information table memory 23 in the device, the optical disk 18 can be transmitted to the optical disk 18 in the same procedure as described in the first embodiment. Any recorded selected image can be searched and displayed.

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

Embodiment 3 FIG.
FIG. 5 is a block circuit diagram showing a video disc 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 detecting circuit 27 reproduces the data from the optical disc 18. The second embodiment differs from the second embodiment in that a GOP header and a sequence header in a bit stream of encoded data are detected.

Next, an operation of a portion different from the second embodiment will be described.
The header detection circuit 27 detects a GOP header or a sequence header of the video data decoded by the decoder 11, and the address monitoring circuit 26 determines at which address on the optical disc 18 the encoded data corresponding to the image is recorded. Monitoring.

  Using the address monitoring circuit 26 and the header detection circuit 27, the address at which 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 signals 15, an image selection signal 35 indicating that this image has been selected is input to the address monitoring circuit 26, and encoded data of the selected image is recorded. The address can be known, and the address is stored in the information table memory 23.

  An outline of the table stored in the information table memory 23 in this manner is as shown in FIG.

  Further, the ID signal is recorded on a specific portion of the optical disk 18 by operating the switch 25 at a time desired by the user, for example.

  By using the ID signal recorded on the optical disc 18 and the address of the selected image stored in the information table memory 23 in the apparatus in this manner, the arbitrary procedure can be performed from the optical disc 18 in the same procedure as described in the first embodiment. Can be searched and displayed.

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

Embodiment 4. FIG.
FIG. 6 is a block circuit diagram showing a video disc 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. A switch for switching processing, 29 is a low-pass filter (LPF) required 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 a list image memory 31 The switch is operated when the displayed list display image is displayed.

Next, an operation of a portion different from the first embodiment will be described. The operation at the time of recording is the same as in the first embodiment.
At the time of reproduction, by using the ID signal recorded on the optical disk 18 and the information table memory 23 in the apparatus, any selected image recorded on the optical disk 18 can be displayed in a list, and the recorded contents of the optical disk 18 can be displayed. You can know quickly.

Next, the operation of displaying a list of selected images will be described with reference to the flowchart of FIG.
First, when a list display is instructed and the list display operation is started, the operation from reading the ID signal recorded in the specific portion of the optical disk 18 in step 1 to ending the decoding of the picture of the selected image in step 6 is as follows. , And FIG. Next, in step 11, the switch 28 is switched to the LPF 29 side to remove high-frequency components in preparation for the subsequent processing, and thereafter, the sub-sampling circuit 30 performs sub-sampling to 1 / N to reduce 1 / N. A process for converting an image into a reduced image is performed. Next, the 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 the N selected images recorded in the disk 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 can be displayed in FIG. 8, so that the contents recorded on the optical disk 18 can be easily known.

Embodiment 5 FIG.
FIG. 9 is a block circuit diagram showing a video disk reproducing apparatus according to a fifth embodiment of the present invention. The same reference numerals as those in FIG. 1 denote the same or corresponding parts, and 33 denotes a video recorded on a specific portion of the optical disk 18. An ID signal detection circuit 34 for detecting and utilizing a bit sequence such as a signal to generate an ID signal is switched between normal reproduction and when the ID signal detection circuit 33 generates an ID signal from a bit sequence of a specific portion of the video disk 18. Switch.

  Next, a portion of the fifth embodiment that is different from the playback operation of the first embodiment will be described. Normally, the video signal and the like recorded on each optical disc are different, so that the bit sequence recorded on a specific portion of the optical disc differs from disc to 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 on a specific portion of the optical disk.

  Next, an operation of searching and displaying an arbitrary selected image from the images recorded on the 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 in step 21. The ID signal detection circuit 33 detects a bit string recorded on a specific portion of the optical disc 18 and generates an ID signal using the detected bit string. Next, in step 2, a sequence header address, a GOP header address, a 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 in step 3, the corresponding sequence header is accessed. Then, in step 4, the GOP header is accessed to obtain the information written therein. Then, in step 5, the switch 34 is switched to the information decompression means 13 side to start decoding in order from the top picture of the GOP. When decoding of the selected image is completed in step 6, the decoding screen of the selected image is displayed in step 7. , Step 8, when the operation from Step 3 to Step 7 is repeated to complete the search, the operation ends.

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

  Next, a portion of the fifth embodiment that is different from the playback operation of the first embodiment will be described. The various headers described above include a unique word that is information for identifying each of them. By detecting the unique word, the various headers can be detected and determined. The header detection circuit 27 detects a GOP header or a sequence header using this method.

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

  Using the address monitoring circuit 26 and the header detection circuit 27, the address at which 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 at which 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.

  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 a specific portion of the optical disk 18. It is stored in the memory 23.

  FIG. 2B is a schematic diagram of a table stored in the information table memory in this manner.

  In order to search and display an arbitrary selected image recorded on the optical disk 18 by the video disk reproducing apparatus having the above configuration, 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 portion of the optical disc 18 and to generate an ID signal using the bit string. Then, a sequence header address, a GOP header address, a selected image head address, and the like corresponding to the generated ID signal are read from the information table memory 23 in the apparatus, and jump to the corresponding sequence header and GOP header, and the information written therein is read. obtain. Then, decoding is performed sequentially from the top picture of the GOP, and when decoding of the selected image is completed, a decoding screen of the selected image is displayed. The flowchart of the series of operations is the same as that in FIG.

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

  Next, the operation will be described. The optical disk 18 records highly efficient encoded data of an image having a GOP structure. At the head of each GOP, a GOP header including information necessary for decoding each GOP is added. Further, a sequence header including information on the sequence may be added to the beginning of a sequence including a plurality of GOPs.

  To reproduce the optical disk 18, the compressed video signal recorded on the optical disk 18 is amplified by the reproducing 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 based on the MPEG decoding method, and the analog output image signal 15 and the like are obtained by the D / A converter 14 and displayed on a monitor or the like.

  Normally, since video signals and the like recorded on each optical disc are different, bit strings recorded on a specific portion of the optical disc differ from disc to disc. Utilizing this, the ID signal detection circuit 33 generates an ID signal for identifying the optical disc 18 from a bit string of a video signal or the like recorded in the specific section.

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

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

  FIG. 2B is a schematic diagram of a table stored in the information table memory in this manner.

  By using these, an arbitrary selected image recorded on the optical disk 18 can be displayed in a list, and the recorded contents of the optical disk 18 can be quickly known. FIG. 13 is a flowchart showing the operation of displaying a list of the selected images.

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

  Then, based on these, the sequence header is accessed in step 3 to obtain sequence information. Then, in step 4, the GOP header is accessed. In step 5, decoding is started from the first picture of the GOP. In step 6, after decoding of the picture of the selected image is completed, the switch 28 is operated. Perform processing to convert to an image. Therefore, high-frequency components are removed by the low-pass filter 29 in preparation for the subsequent processing. Thereafter, the image is sub-sampled to 1 / N by the sub-sampling circuit 30 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 the N selected images recorded in the disk (step 13). FIG. 8 shows a list image stored in the list image memory. By operating the switch 32 in step 14 to display the list image, the contents recorded on the optical disk 18 can be easily known.

  In each of the above embodiments, the example in which the selected image is mainly used as the search image has been described. However, it is apparent that the present invention can be applied to, for example, an image for the beginning of a program or an image for which reproduction was interrupted last time. is there.

1 is a block circuit diagram showing a video disk recording / reproducing apparatus according to an embodiment of the present invention. FIG. 4 is a diagram for explaining the operation of the first embodiment. 9 is a flowchart illustrating an operation at the time of image search according to the first, second, and third embodiments of the present invention. FIG. 6 is a block circuit diagram showing a video disk recording / reproducing device according to a second embodiment of the present invention. FIG. 11 is a block circuit diagram showing a video disk recording / reproducing apparatus according to a third embodiment of the present invention. FIG. 13 is a block circuit diagram showing a video disk recording / reproducing apparatus according to a fourth embodiment of the present invention. 14 is a flowchart illustrating an operation of displaying a list image according to the fourth embodiment. FIG. 14 is a diagram illustrating a list display image of the fourth and seventh embodiments. FIG. 14 is a block circuit diagram showing a video disk reproducing device according to a fifth embodiment of the present invention. 16 is a flowchart illustrating an operation at the time of image search according to the fifth and sixth embodiments. FIG. 14 is a block circuit diagram showing a video disc reproducing apparatus according to Embodiment 6 of the present invention. FIG. 14 is a block circuit diagram showing a video disc reproducing device according to a seventh embodiment of the present invention. 19 is a flowchart illustrating an operation of displaying a list image according to the seventh embodiment. FIG. 11 is a block circuit diagram showing a conventional optical disk recording / reproducing device. FIG. 3 is a diagram for explaining a data array structure of the MPEG system. FIG. 3 is a diagram for describing a coding structure of a GOP.

Explanation of reference numerals

  Reference Signs List 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 switches, 26 address monitoring circuit, 27 header detection circuit, 29 low-pass filter (LPF), 30 sub-sampling circuit, 31 list image memory, 33 ID signal detection circuit, 35 image selection signal, 101 sequence header, 102, 121 G P, 103 GOP header, 104 I1 picture, 105 P4 picture, 106 B6 picture, 107 sequence header address, 108 GOP header address, 109 B6 picture coded data head address, 110 ID signal sequence, 111 selected image number sequence, 112 sequence Header start address sequence, 113 GOP header start address sequence, 114 Selected image start address sequence, 122 GOP layer, 123 slice, 124 slice layer, 125 macro block layer, 126 block layer, 131 I picture, 132 P picture, 133 B picture .

Claims (4)

An I picture compressed in a frame, a P picture compressed by adding motion compensation by a temporally forward I picture, and a motion compensated by a temporally forward or backward I picture or P picture. A video disc recording method for recording, on a video disc, a sequence including a plurality of video information blocks each including a data-compressed B picture as one unit,
An address of a header at the head of the sequence and an ID signal for identifying the video disc are arranged on the video disc,
The video disc recording method according to claim 1, wherein the address of the header is information for a user to select an image and to access a head of a sequence including the selected image. 2. The video disc recording method according to claim 1, wherein the selected image is for displaying a list image composed of N (N ≧ 1) selected images. An I picture compressed in a frame, a P picture compressed by adding motion compensation by a temporally forward I picture, and a motion compensated by a temporally forward or backward I picture or P picture. A sequence including a plurality of video information blocks each including a data-compressed B picture as one unit;
The address of the header at the beginning of the sequence,
A method for reproducing a video disk on which an ID signal for identifying the video disk is recorded,
Reading the ID signal,
A method for reproducing a video disc, comprising: when a user selects an image, accessing a head of a sequence including the selected image based on an address of the header. 4. The video disk reproducing method according to claim 3, wherein a list image display composed of the N selected images (N ≧ 1) is performed.

Images