A fast intra prediction method using the distribution of adjacent pixels in HEVC

This letter proposes a fast intra prediction method to reduce encoding time for the high-efficiency video coding (HEVC) standard, which involves an increase in the number of intra-modes. The proposed intra-mode coding method uses correlation between intra-modes and adjacent pixels. The proposed method skips half of the intra-modes in certain blocks, specifically those that satisfy predetermined conditions. Using the half of intra-modes reduces number of bits for intra-mode coding and offsets a decline of coding performance caused by mode skipping. The experimental results show that the proposed method achieved 5.87% reduction in encoding time compared to the HEVC test model 7.1 encoder with almost no loss in coding performance.