An efficient mode decision algorithm for real-time high-definition H.264/AVC transcoding

In this paper, we propose an efficient inter frame mode decision algorithm for H.264/AVC transcoding mainly applied to HD video bit-rate reduction. In the proposed algorithm, four measures including mode conversion, mode pre-detection, search centre selection, and SAD reuse are presented for improving the coding efficiency and mode decision accuracy. The experimental results show that the proposed algorithm has about 0.45dB Y-PSNR enhancement and 73% less search points in motion estimation compared with the UMHexagonS algorithm.