Fast intra mode decision for H.264/AVC encoding
Wenbin Zheng · Computer Engineering and Applications Journal · 2012
H.264/AVC uses the rate distortion optimization method to determine the best mode for a macroblock(MB)to improve coding efficiency.But it increases computational complexity.To overcome this shortcoming,a fast intra mode decision algorithm for H.264 is raised.In chroma prediction,four prediction modes can be reduced into one or two modes according to the textural features of a MB.In luma 16×16 prediction,the mode which has lowest Sum of Absolute Transformed Difference(SATD)can be selected as the best prediction mode.In luma 4×4 prediction,the algorithm chooses three probable modes from nine modes as the candidate modes.Comparing the total cost of sixteen 4×4 blocks and one 16×16 block,the best block size can be determined.Experimental results show that the coding time of the propose method is decrease about 68% while maintaining similar PSNR and bit rate performance of H.264 intra encoding.