A Novel Intra/Inter Mode Decision Algorithm for H.264/AVC Based on Spatio-temporal Correlation

摘要

The high computation burden of mode decision procedure is a challenge to extensive application of H.264/AVC. In this paper, we present a binary mode decision scheme that intra/inter coding mode is decided without performing the exhaustive spatial prediction and motion estimation search. This decision algorithm is based on spatio-temporal feature of current macroblock. And a fast adaptive intra prediction algorithm is provided for further timesaving. By avoiding a large amount of prediction processing, the computation complexity can be greatly reduced. Experimental results indicated that the proposed algorithm, compared by full-search algorithm, can achieve reduction of 54.60% encoding time on average, with a negligible average PSNR loss of only 0.0085 dB and a mere 0.28% bit-rate increase.