Patent ID: 6333948
Filing Date: 2001-12-25
Classification: H04N

Abstract:
A video coding apparatus, dividing each frame of a motion picture into a predetermined number m of groups of blocks, for coding the motion picture while switching a coding mode between an INTER coding mode and an INTRA coding mode in units of block included in each group of blocks, comprising:motion determination means for determining whether or not there is motion exceeding a predetermined threshold in an object in each region of said number m of groups of blocks in each frame during a lapse of a prescribed time T from a prescribed point;whole-group refresh means for performing whole-group refresh, defined as an operation of INTRA-coding all blocks included in a group of blocks in a coding process for the same frame, on a group of blocks of a region determined by said motion determination means as having motion exceeding said threshold; anddispersed refresh means for performing dispersed refresh, defined as an operation of INTRA-coding each block included in a group of blocks in a coding process for frames varying with the block while regarding groups of blocks being in the same position in the respective frames among groups of blocks in the frames as the same group of blocks, on a group of blocks of a region determined by said motion determination means as having no motion exceeding said threshold.