Patent ID: 6724821
Filing Date: 2004-04-20
Classification: H04N

Abstract:
A picture coding apparatus comprising:a motion vector detector detecting motion vectors between a current picture data and a reference picture data in units of macro blocks; a vector code length optimizing section determining one of a plurality of parameters based on a total quantity of vector codes for differential motion vectors obtained from said detected motion vectors, said vector code including a vector variable length code and a vector fixed length code; a motion vector coding unit encoding each of said differential motion vectors into said vector code using said determined parameter; a variable length coding section encoding picture data difference into picture data variable length codes in units of macro blocks, said picture data difference indicating a difference between said current picture data and a data obtained by carrying out a motion compensation to said reference picture data based on said detected motion vectors; and a multiplexing unit multiplexing said picture data variable length code and said fixed length code for every macro block.