Optimization on Fast Motion Estimation Algorithm Based on x264
Xiaobin Qiu · Control Engineering of China · 2010
Motion estimation is the most important and time consuming part of H.264 video coding,it takes about 60 %~80 % of encoding time.To improve the encoding speed of the UMHexagonS algorithm in x264,an optimized algorithm is proposed via the modified scheme of the threshold selection,early termination of condition and big hexagon search mode.The modified method of the COST_MV() function is presented to shorten the computing time of SAD value.The simulation experimentation shows that the proposed algorithms can reduce search points by about 30 % with small video quality decline,saves 20 % to 40 % of the estimated time and enhance the real-time performance of the encoder.