H.264 introduces intraprediction coding technique to improve the intracoding efficiency.This enormously increases the computational complexity. In order to decrease the computational complexity of the algorithm

a fast algorithm for intra prediction mode decision based on pixel’s edge vector’s variance

the relation between subblock’s mode and macro block’s mode. Experimental results show that compared with the original intra prediction coding scheme

the proposed algorithm reduce the computational complexity of intra prediction coding dramatically with only trivial loss of PSNR and increment of bite rate.