Abstract: Although high-efficiency video coding（HEVC） can reduce bit rates by approximately 50% over its predecessor H.264, 35 prediction modes have been proposed to improve intra-prediction accuracy, resulting in a significant increase in computational complexity and a challenge for both software and hardware implementation. To address this issue, this study proposes a fast algorithm based on HEVC to determine the intra-prediction mode based on the image’s texture direction and correlation between the prediction modes. Experimental results show that this algorithm can save over 46% encoding time when the BD-rate loss is only 5.79% compared to the HEVC reference software HM16.20, which significantly reduces the complexity of the intra prediction mode decision and makes it easy to implement the algorithm landing on the end side with limited hardware resources such as embedded systems.

Key words: high efficiency video coding（HEVC）, intra prediction, angle mode, mode prediction decision