Patent ID: 8059720
Filing Date: 2011-11-15
Classification: H04N

Abstract:
1. A computer program product stored on a non-transitory, computer-readable medium comprising instructions for causing a processor to perform an image down-sampling transcoding method for converting a first image having a first format into a second image having a second format, the image down-sampling transcoding method comprising: (a) decoding a bit stream encoded in the first format; (b) down-sampling a macro block of a predetermined unit in the decoded first image by the use of a predetermined filtering method; (c) calculating rate-distortion costs corresponding to the down-sampled macro block of the first image by performing a predetermined calculation method for each of candidate block modes; and (d) performing an encoding process with the candidate block mode having the least rate-distortion cost, wherein the candidate block mode comprises one or more of a first candidate block mode and a second candidate block mode, the first candidate block mode comprises one or more of a plurality of intra block modes having the second format, and the second candidate block mode comprises one or more of a plurality of inter block modes and a skip mode having the second format, wherein the predetermined calculation method comprises a mean square error (MSE) method and a rate-distortion optimization (RDO) method and wherein the predetermined calculation method in (d) is performed as follows: