HEVC fast intra mode decision based on edge and SATD cost

HEVC(high efficiency video coding) achieves much higher coding efficiency compared with previous video coding standards at the cost of significant computational complexity. This paper proposes a fast intra mode decision scheme, where edge orientation and the sum of absolute Hadamard transformed difference (SATD) are used to consider texture characteristics of blocks. According to these features, the numbers of candidate modes to be tested in rough mode decision and rate-distortion optimization processes are reduced, respectively. In particular, the rate-distortion optimization candidates are selected by Bayesian classification framework to minimize a risk such as coding loss and computation complexity. Experimental results reveal that the proposed scheme reduces encoding run time by 30.3% with a negligible coding loss of 0.9% BD-rate for the all intra coding scenario.