Efficient PU Mode Decision and Motion Estimation for H.264/AVC to HEVC Transcoder
Zong-Yi Chen, Jiunn-Tsair Fang, Tsai-Ling Liao, Pao‐Chi Chang · Signal & Image Processing An International Journal · 2014
H.264/AVC has been widely applied to various applications.However, a new video compression standard, High Efficient Video Coding (HEVC), had been finalized in 2013.In this work, a fast transcoder from H.264/AVC to HEVC is proposed.The proposed algorithm includes the fast prediction unit (PU) decision and the fast motion estimation.With the strong relation between H.264/AVC and HEVC, the modes, residuals, and variance of motion vectors (MVs) extracted from H.264/AVC can be reused to predict the current encoding PU of HEVC.Furthermore, the MVs from H.264/AVC are used to decide the search range of PU during motion estimation.Simulation results show that the proposed algorithm can save up to 53% of the encoding time and maintains the rate-distortion (R-D) performance for HEVC.