Mass center direction-based decision method for intraprediction in HEVC standard
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Increasing the prediction modes and recursive quad-tree structure, can be the reasons for high compression efficiency in high-efficiency video coding (HEVC) standard. For the same reasons, the computational complexity of HEVC is increased compared with the previous standards. One of the parts that impose a high computational load is the intraprediction unit. In this paper, an improved intraprediction mode decision method is presented to accelerate intracoding of HEVC. A mass center direction-based approach is used to find correlation direction of pixels which can effectively eliminate the prediction modes that have low chance to be selected as the best intramode from the rate-distortion optimization computations. According to the founded correlation direction for 4 × 4 blocks, the depth range of coding units can also be reduced to accelerate the intracoding further. The performance of the proposed method evaluated with different test sequences proposed by the joint collaborative team on video coding. The coding results indicate that the proposed method reduces the encoding time significantly as compared with the HM-16.19 reference software with negligible loss of peak signal-to-noise ratio quality.
KeywordsMass center direction Intracoding Prediction mode HEVC
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