Patent ID: 7801417

Claim:
A video information recording method for recording video data comprising a plurality of video units which each include an intra coded I-picture, a predictive coded P-picture including a group of blocks predicted from one picture and a bidirectionally-predictive coded B-picture including a group of blocks predicted from two pictures, said method comprising steps of: coding an access point P-picture by motion compensation prediction using an I-picture located at the beginning of a video unit or a selected preceding P-picture; coding a P-picture or a B-picture by motion compensation prediction using a closest access point P-picture preceding said P-picture or said B-picture as a reference picture, wherein said P-picture or said B-picture is coded without referring to any picture located before said closest access point P-picture; and creating I-picture information including positional information and size information of an access point I-picture which is designated as an access point.