CODING FORMAT CONVERTER PARTIALLY HALTING SEARCH FOR CODING CANDIDATES

摘要

A coding format converter for converting an input stream of data of pictures of a first coding format into a data stream of data of pictures with a second coding format includes a decoder decoding the input stream with the first coding format, an encoder encoding the data of the picture thus decoding with the second coding format, a coding candidate search controller using first information on prediction residual availability indicative of whether or not residual information is encoded for each block in the decoded picture. When a search for coding candidates reveals a result that the first information for a coding target region of the picture is indicative of the absence of a residual, the controller refrains from searching for coding candidates which depend on second information on residual availability of the coding with the second coding format.

主权项

1. A coding format converter for converting an input stream including data of a picture encoded with a first coding format into an output stream including data of a picture encoded with a second coding format, comprising:
a decoder decoding the data of the picture in the input stream with the first coding format to produce resultant data of the picture; an encoder encoding the resultant data of the picture with the second coding format and searching for a coding candidate to output the coding candidate; and a coding candidate search controller using, for each block of the data obtained by said decoder, first information on prediction residual availability indicative of whether or not residual information is encoded to control said encoder to search for the coding candidate, wherein, when a result of the searching shows that the first information for a coding target region of the data to be encoded is indicative of an absence of a residual, said coding candidate search controller halts the search for a coding candidate which depends on second information on residual availability of the coding with the second coding format.