Patent ID: 9635372
Date: 2017-04-25
CPC Classifications: H04N

Claim:
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.