Patent ID: 6792045
Filing Date: 2004-09-14
Classification: H04N

Abstract:
An image signal transcoder temporarily decoding an input bit stream of coded image signal and re-coding said image signal under a prescribed system, comprising:a decoding processing portion decoding said input bit stream according to a prescribed coding standard and outputting decoded image data while extracting coding information of said input bit stream; a coding processing portion re-coding said decoded image data under said prescribed coding standard and forming an output bit stream; and a control portion setting a coding parameter in re-coding of said coding processing portion on the basis of said coding information; wherein said prescribed coding standard is the MPEG2 standard; said coding information includes information related to an upper layer and information of a macroblock level; and said decoding processing portion includes: a stream analysis portion receiving said input bit stream and extracting said information related to said upper layer, an MPEG2 decoding function portion decoding said input bit stream received through said stream analysis portion and outputting said decoded image data while extracting said information of said macroblock level, an upper layer information storage portion receiving said information related to said upper layer from said stream analysis portion and supplying said information to said MPEG2 decoding function portion and said control portion, and a macroblock level information storage portion receiving said information of said macroblock level from said MPEG2 decoding function portion and supplying said information to said control portion.