US 6,724,821 B1 · Picture coding apparatus with coding efficiency improved

Abstract

A picture coding apparatus includes a motion vector detector, a vector code length optimizing section, a motion vector coding unit, a variable length coding section, and a multiplexing unit. The motion vector detector detects motion vectors between a current picture data and a reference picture data in units of macro blocks. The vector code length optimizing section determines one of a plurality of parameters based on a total quantity of vector codes for differential motion vectors obtained from the detected motion vectors. The vector code includes a vector variable length code and a vector fixed length code. The motion vector coding unit encodes each of the differential motion vectors into the vector code using the determined parameter. The variable length coding section encodes picture data difference into picture data variable length codes in units of macro blocks. The picture data difference indicates a difference between the current picture data and a data obtained by carrying out a motion compensation to the reference picture data based on the detected motion vectors. The multiplexing unit multiplexes the picture data variable length code and the fixed length code for every macro block.

Claims15

Dependent claims

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.

3 more elements

A method of encoding a picture data in an MPEG system, comprising:

detecting motion vectors between a current picture data and a reference picture data in units of macro blocks;
determining a specific 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;
encoding each of said differential motion vectors into said vector code using said determined specific parameter;
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
multiplexing said picture data variable length code and said fixed length code for every macro block.

3 more elements

Dependencies are inferred from the claim text.

Picture coding apparatus with coding efficiency improved

Life of this patent

Picture coding apparatus with coding efficiency improved

Life of this patent

Abstract

Claims15