Randomly accessible visual information recording medium and recording method, and reproducing device and reproducing method
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsTomoaki Ryu, Kazuhiko Nakane, Masaaki Shimada, Yoshihisa Yamada
Life of this patent
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Abstract
Access point pictures designated as randomly accessible positions are I pictures or P pictures. Information indicating the decoding sequence (I1, P1, B1, B2, B3, B4, P2, . . . ) of pictures functioning as access points and attribute information (picture_type) indicating whether a picture functions as an access point or is necessary for decoding of the access point following a given access point are recorded on the video information recording medium. Random access is possible even if the GOP interval is lengthened.
Claims2
A non-transitory recording medium for a playback device, said recording medium containing video data comprising a plurality of video units each of which includes an intra coded I-picture, a predictive coded P-picture including a group of blocks predicted from one picture and a bi-directionally-predictive coded B-picture including a group of blocks predicted from two pictures, said medium comprising:
- a video data recording area for storing said video data comprising said video units, at least one of said video units including an access point P-picture coded by motion compensation prediction using an I-picture located at the beginning of said video unit including said access point P-picture or a selected one of preceding P-pictures,
- wherein said access point P-picture is a P-picture to be decoded for video reproduction,
- wherein any P-pictures, other than access point P-pictures, and any B-pictures following said access point P-picture in the same video unit are coded without referring to any picture preceding said access point P-picture;
- wherein said video data recording area contains an attribute information including a picture type information having a first value indicating each access point P-picture included in said video unit, and including a picture type having a second value different from the first value indicating each P picture included in said video unit that is not an access point P-picture but which is necessary to decode the next access point P-picture,
- wherein said attribute information is included in supplemental enhancement information (SEI) according to MPEG4-AVC,
- wherein said access point P-picture indicated by the first value is decoded using said I-picture and said P-pictures indicated by the second value, and
- wherein a playback device accesses said attribute information and identifies pictures which are necessary for decoding said access point P-picture.
Dependencies are inferred from the claim text.