||High efficiency video coding (HEVC) is the latest video coding standard. The coding unit(CU) of HEVC uses a quadtree-based coding structure to increase coding performance. To improve predict more accurately, using 35 prediction modes in intra prediction. This process which is meant to improve the efficiency in HEVC intra prediction however leads to a significantly higher computational complexity. Hence, in this paper, we proposed an SVM based fast intra CU depth decision algorithm to reduce the computational complexity. We apply SVM with|
features, including Variance, low-frequency AC value, and neighboring CU depth to our fast CU depth decision algorithm. In the procedure of Rate Distortion Optimization (RDO) of intra prediction, we will compare the SATD costs of all candidate modes with the smallest one. If the ratio is higher than the threshold, then we delete the modes to reduce the number of candidates for time saving.
Then we would introduce screen content coding, to diminish time consumption, the CUs can be classified into two groups, NCCU(natural content CU) and SCCU(screen content CU),according to the statistical characteristics, then we could skip screen content modes in NCCU, finally, we combine fast CU decision and fast mode decision to our screen content coding algorithm to reduce much more computational complexity.
|| “Generic coding of moving pictures and associated audio information,” ISO/IEC 13818-2: Video (MPEG-2), May 1996. |
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