Predictive video coding procedure, predictive video coding device, predictive video coding program, predictive video decoding procedure, predictive video decoding device and predictive video decoding program

摘要

A method of predictive video decoding executed by a predictive video decoding device, comprising: an input stage for entering compressed image data for each of a plurality of images constituting a video sequence, containing the image data compressed data resulting from predictive coding using a plurality of reference images that have been previously decoded and reproduced, and data encoded from BD memory description information [k] related to the plurality of reference images, describing the information of BD buffer description [k] a number of reference images to be stored in the buffer and information to identify which reference image is to be stored; a reconstruction step to decode the compressed image data to reconstruct a reproduced image; an image storage step for storing at least said reproduced image as a reference image that will be used to decode a subsequent image; and a buffer memory management stage for controlling the image storage stage, where, prior to the reconstruction of the reproduced image, the buffer buffer stage comprises decoding, with reference to buffer memory description information BD [m ] for another image other than the reproduced image, the encoded data of the BD buffer description information [k] for the reproduced image, and then control the image storage stage based on the BD buffer description information [k] decoded, where decoding of the encoded data of the BD buffer description information [k] for the reproduced image includes: decoding an index m identifying the BD buffer description information [m] for another image different from the reproduced image, decode a deltaBD value that represents a difference between inform ation of identification of the corresponding reference images in the BD [m] and in the BD [k], the identification information being a POC (image output count) indicating an output order of the corresponding reference image, decode a plurality of ibd_flag [j] indicators that indicate whether the jth reference image included in the BD [m] is used or not to decode an objective image of the current processing and if an identification information of an image of jth reference included in the BD [m] is used, or not, to decode an identification information of a reference image included in the BD [k], and decode information about the reference image in the BD [ k] based on the decoded index m, the buffer description information BD [m], the decoded value of deltaBD and the decoded indicators ibd_flag [j], and where, in the decoding of the information about d e the reference image included in the BD [k], when the ibd_flag [j] indicator is "1", the jth reference image included in the BD [m] is applied to decode the target image of the current processing; when the ibd_flag [j] indicator is "01", the jth reference image included in the BD [m] is not applied to decode the target image of the current processing, but is applied to decode a subsequent future image according to the decoding order; and when the ibd_flag [j] indicator is "00", the jth reference image included in the BD [m] is not used for decoding the information about the reference image included in the BD [k].