Specially formatted optical disk and method of playback

• US 6,167,190 A
• Filed: 07/01/1998
• Issued: 12/26/2000
• Est. Priority Date: 06/24/1994
• Status: Expired due to Term

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Nagasawa, Masato
• Primary Examiner(s): Nguyen, Huy
• Application Number:
  US09/108,798
• Time in Patent Office: 909 Days
• Field of Search: 386/111, 386/68, 386/112, 386/124, 386/125, 386/80, 386/81, 386/105, 386/101, 386/70, 386/82, 386/126
• US Class Current: 386/329
• CPC Class Codes: G11B 20/10 Digital recording or reproducing
• CPC Class Codes: G11B 20/1217 on discs
• CPC Class Codes: G11B 20/1251 for continuous data, e.g. digitised analog information signals, pulse code modulated [PCM] data
• CPC Class Codes: G11B 20/1258 where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs
• CPC Class Codes: G11B 2220/20 Disc-shaped record carriers
• CPC Class Codes: G11B 2220/216 Rewritable discs
• CPC Class Codes: G11B 2220/2525 Magneto-optical [MO] discs
• CPC Class Codes: G11B 2220/2537 Optical discs
• CPC Class Codes: G11B 27/005 Reproducing at a different information rate from the information rate of recording for television signals H04N5/783
• CPC Class Codes: G11B 27/034 on discs G11B27/036, G11B27/038 take precedence
• CPC Class Codes: G11B 27/036 Insert-editing
• CPC Class Codes: G11B 27/105 of operating discs
• CPC Class Codes: G11B 27/19 by using information detectable on the record carrier
• CPC Class Codes: G11B 27/24 by sensing features on the record carrier other than the transducing track ; sensing signals or marks recorded by another method than the main recording
• CPC Class Codes: G11B 27/28 by using information signals recorded by the same method as the main recording G11B27/22 takes precedence
• CPC Class Codes: G11B 27/3027 used signal is digitally coded
• CPC Class Codes: G11B 27/329 on a disc [VTOC]
• CPC Class Codes: G11B 7/0037 with discs
• CPC Class Codes: G11B 7/00745 Sectoring or header formats within a track formats in general G11B20/12
• CPC Class Codes: G11B 7/08541 involving track counting to determine position
• CPC Class Codes: H04N 19/61 : in combination with predictive coding
• CPC Class Codes: H04N 5/783 : Adaptations for reproducing at a rate different from the recording rate
• CPC Class Codes: H04N 5/85 : on discs or drums
• CPC Class Codes: H04N 9/804 : involving pulse code modulation of the colour picture signal components
• CPC Class Codes: H04N 9/8042 : involving data reduction
• CPC Class Codes: H04N 9/8063 : using time division multiplex of the PCM audio and PCM video signals

Abstract

In an optical disk storing digital image information in the form of a succession of blocks, each comprising a plurality of frames comprising I-, P- and B-pictures, wherein an address format is preformatted in front of the block of image information of said plurality of frames, and the data arrangement within each image information blocks is such that I- and P-pictures are collectively disposed. The position of the I-pictures within each block is shifted from one block to another. The I-picture data may be divided into fraction according to the position on the screen, the DCT frequency, or layering, and the fractional I-picture data may be arranged in the image information blocks, and a header or parity signal is recorded in front of each fractional I-picture data. With such a configuration, it is possible to increase the speed of fast playback, and realize smooth playback picture.

Claims

1. An optical disk recording digital image information in the form of a succession of image information blocks, each comprising I-picture data of an I-picture obtained by intra-frame encoding, P-picture data of one or more P-pictures obtained by encoding with forward motion compensation, and B-picture data of B-pictures obtained by encoding with motion compensation using the data of the I- and/or P-pictures positioned in front and at the back thereof as reference pictures,

wherein address data preformatted in front of the respective image information blocks is aligned on a straight line extending in the radial direction to reduce rotation waiting time upon a track-jump event.

2. A method of playing back an optical disk comprising:

raising the rotational speed of the optical disk for a region in which no data needs to be read during fast forward or reverse playback of a motion picture image recorded on the optical disk, and

lowering the rotational speed to the linear velocity at which reproduction of data is possible, for a region in which I- and P-picture data have been recorded.

4. A machine readable optical disk recording digital image information in the form of a succession of image information blocks, each comprising I-picture data of an I-picture obtained by intra-frame encoding, P-picture data of one or more P-pictures obtained by encoding with forward motion compensation, and B-picture data of B-pictures obtained by encoding with motion compensation using the data of the I- and/or P-pictures positioned in front and the back thereof as reference pictures,

said I-picture data being divided into screen-divided I-picture data such that each screen-divided I-picture data encodes one of a plurality of regions into which a display screen is spatially divided,

each of said screen-divided I-picture data including a plurality of slices;

and

each of said screen-divided I-picture data being arranged in each of said image information blocks, and

a header or parity signal being recorded in front of each screen-divided I-picture data, wherein the machine readable disk increases an efficiency of a machine reading the disk by recording digital image information using the above-stated format.

3. A method of playing back an optical disc according to claim 4, further comprising:

increasing the rotational speed of the optical disk during fast playback or reverse playback of a motion picture image to a rotational speed higher than the rotational speed of the optical disk during normal playback.

5. The optical disk according to claim 4, wherein the order of data arrangement of I-, P-, and B-picture data within an image information block is different at least between track-adjacent image information blocks.

6. The optical disk according to claim 4, wherein identification signal indicating whether the I-picture data is a screen-divided data, a frequency-divided data, or data divided by the numbers of pixels and lines is written at the head of each image information block.

7. The optical disk according to claim 4, wherein the head positions of the digital image information blocks are aligned in the radial direction of the optical disk.

8. A method of playing back from the optical disk of claim 5 comprising the steps of:

using an optical disk playback device including a tracking actuator for tracking a scanning spot on a predefined track, a tracking control circuit, and track jump circuit for performing jumping scanning, and repeating jumping operation on the basis of a header or parity signal recorded in front of each screen-divided I-picture data to perform high-speed forward or reverse playback.

9. A machine-readable optical disk encoded with a data structure comprising:

encoded I-picture data divided into a plurality of I-picture sub-blocks such that each I-picture sub-block is allocated encoded I-picture data according to the horizontal and vertical frequencies, from a DC component to the high-frequency components,

track-adjacent I-picture sub-blocks in the track-adjacent image information blocks in the adjacent tracks being disposed with their order being altered from one track to a next track, and

a header or parity signal indicating for each I-picture sub-block which of the frequency components is contained in each I-picture sub-block being recorded in front of each I-picture sub-block, wherein the machine readable disk increases an efficiency of a machine reading the disk by recording digital image information using the above-stated format.

10. The optical disk according to claim 9, which encoded I-picture data is allocated into a plurality of sub-blocks according to the horizontal and vertical frequencies, from the DC components to the high-frequency components, the frequency-divided I-picture data within the adjacent image information blocks in the adjacent tracks are disposed differently, and header or parity signal indicating which of the frequency components the content of each sub-block is for is recorded in front of each sub-block.

11. The optical disk according to claim 9, wherein the order of data arrangement of I-, P- and B-picture data within an image information block is different at least between track-adjacent image information blocks.

12. The optical disk according to claim 9, wherein identification signal indicating whether the I-picture data is a screen-divided data, a frequency-divided data, or data divided by the numbers of pixels and lines is written at the head of each image information block.

13. The optical disk according to claim 9, wherein the head positions of the digital image information blocks are aligned in the radial direction of the optical disk.

14. A method of playing back from the optical disk according to claim 10, comprising the steps of:

using an optical disk playback device comprising a tracking actuator for tracking a scanning spot on a predefined track, a tracking control circuit, and a track jump circuit for performing jumping scanning, and

repeating jumping operation on the basis of a header or parity signal recorded in front of each I-picture data to perform high-speed forward or reverse playback.

15. A machine-readable optical disk storing digital image information in the form of a succession of blocks, comprising:

each block including a plurality of frames having, in mixture, I-picture data forming image information obtained by intra-frame encoding, P-picture data obtained by encoding with forward motion compensation, and B-picture data obtained by encoding with motion compensation using said I- and/or P-picture data positioned in front and at the back thereof as references,

the digital image information being divided into lower-layer data and upper-layer data wherein an image obtained by the lower-layer data alone has a resolution lower than a resolution of image data obtained from the combination of the upper-layer data and the lower-layer data,

a header or parity signal for indicating whether lower-layer data or upper-layer data is recorded in front of each corresponding block, and

the order of data arrangement of I-, P- and B-picture data within a block being different at least between track-adjacent blocks, wherein the machine readable disk increases an efficiency of a machine reading the disk by recording digital image information using the above-stated format.

16. The optical disk according to claim 15, wherein identification signal indicting whether the I-picture data is a screen-divided data, a frequency-divided data, or data divided by the numbers of pixels and lines is written at the head of each image information block.

17. A method of playing back from the optical disk of claim 16,

comprising the steps of:

using an optical disk playback device comprising a tracking actuator for tracking a scanning spot on a predefined track, a tracking control circuit, and a track jump circuit for performing jumping scanning, and

repeating jumping operation on the basis of an identification signal written at the head of each image information block to perform high-speed forward or reverse playback.

18. The optical disk according to claim 15, wherein the head positions of the digital image information blocks are aligned in the radial direction of the optical disk.

19. A method of playing back from the optical disk according to claim 16 comprising the steps of:

using an optical disk playback device comprising a tracking actuator for tracking a scanning spot on a predefined track, a tracking control circuit, and a track jump circuit for performing jumping scanning, and

repeating jumping operation on the basis of a header or parity signal recorded in front of each I-picture data to perform high-speed forward or reverse playback.