Fast fractional-pel interpolation algorithm of H.264 based on CUDA

X G Hong¹, H Liu¹, Y Xiao²

¹School of Information Engineering, Nanchang University, Nanchang 330031, China

²Institute of Computing Technology, Nanchang 330031, China

H.264 video standard introduces fractional pixel motion compensation technology to obtain a more precise motion vector and a higher compression ratio. But, it increases the complexity of the motion compensation process at the same time. In order to solve the difficulties, we analysis the procedure of fractional-pel interpolation in H.264 and propose a fast fractional-pel interpolation algorithm based on CUDA. Experimental results show that the fast algorithm enables locating fractional pixel effectively and improves the speed of fractional pixel motion estimation. Compared with the CPU serial algorithm, the fast algorithm can significantly improve encoding rate almost four times in processing high-resolution video sequences.