Image coding apparatus and an image decoding apparatus

• US 20020044694A1
• Filed: 12/20/2001
• Published: 04/18/2002
• Est. Priority Date: 11/07/1996
• Status: Active Grant

• Current Assignee: Godo Kaisha IP Bridge 1 (IP Bridge, Inc.)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Matsumoto, Taisuke
• Granted Patent: US 6,681,048 B2
• Time in Patent Office: Days
• US Class Current: 382/238
• CPC Class Codes: H04N 19/13 Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
• CPC Class Codes: H04N 19/157 Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/196 being specially adapted for the computation of encoding parameters, e.g. by averaging previously computed encoding parameters processing of motion vectors H04N19/513
• CPC Class Codes: H04N 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/463 by compressing encoding parameters before transmission
• CPC Class Codes: H04N 19/593 involving spatial prediction techniques
• CPC Class Codes: H04N 19/60 using transform coding
• CPC Class Codes: H04N 19/91 Entropy coding, e.g. variable length coding [VLC] or arithmetic coding

Abstract

An image coding method and apparatus for coding each block of a digital image divided into a plurality of two-dimensional blocks, wherein each block has a plurality of pixels. A coding mode for a target block is determined by a code mode determining section to output mode information of the target block. The mode information of the target block is coded, by a mode information coding section, using mode information of previously coded blocks at the periphery of the target block. Pixel data of the target block is then coded by a block data coding section according to the mode information of the target block. A computer readable recording medium that contains an image coding program is also disclosed.

Claims

1. An image coding method for coding each block of a digital image divided into a plurality of two-dimensional blocks, each block having a plurality of pixels, the method comprising:

determining a coding mode for a target block to output mode information of the target block;

coding the mode information of the target block using mode information of previously coded blocks at a periphery of the target block; and

coding pixel data in the target block according to the mode information of the target block.

2. An image coding apparatus that codes each block of a digital image divided into a plurality of two-dimensional blocks, each block having a plurality of pixels, said apparatus comprising:

a coding mode determining section that determines a coding mode for a target block to output mode information of said target block;

a mode information coding section that codes said mode information of said target block using mode information of previously coded blocks at a periphery of said target block; and

a block data coding section that codes pixel data of said target block according to said mode information of said target block.

3. A computer readable recording medium with an image coding program stored therein, said image coding program being executed by a computer to execute procedures for coding each block of a digital image divided into a plurality of two-dimensional blocks, each block having a plurality of pixels, said image coding program comprising:

determining a coding mode for a target block to output mode information of said target block;

coding said mode information of said target block using mode information of previously coded blocks at a periphery of the said target block; and

coding pixel data in the target block according to the mode information of the target block.