Fast macroblock mode decision in H.264

H.264 (MPEG4 AVC) is a new video coding standard jointly developed by ITU-T and ISO MPEG. H.264 derives most of its coding efficiency improvements from motion estimation which, on the other hand, has greatly increased the computational complexity of the CODEC, so many fast motion estimation algorithms have been proposed, such as MVFAST, HEXBS and so on. In this paper, we propose a fast mode decision method which can greatly reduce the computational complexity of subpixel motion estimation and speed up the encoder.