Block Adaptive Selection Of Multiple Core Transforms For Video Coding
2016 PICTURE CODING SYMPOSIUM (PCS)(2016)
摘要
Transform coding tools in video coding have traditionally relied on the Discrete Cosine Transform Type II (DCT-II) to map residual signals to a new domain where quantization and entropy coding tools achieve a better coding efficiency than in the spatial domain. However, the DCT-IT is not sufficient to model all different types of residual signals efficiently, especially in the intra-predicted blocks case. For this reason, the DST-VII was introduced in H. 265/High Efficiency Video Coding (HEVC) in order to improve the compression performance of 4 x 4 intra-predicted blocks. In this paper we propose a multiple core transform approach, in which each transform is separable and generated by combining two one-dimensional transforms for the vertical and horizontal directions. The pair of 1-D transforms is selected from a set of three different types of Discrete Trigonometric Transforms and the Identity Transformation. Test results show that the proposed algorithm achieves bit rate reductions of 3% on average with respect to HEVC for intra-predicted residuals.
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关键词
Transform Coding,Intra Coding,Multiple Transforms,Separable Transforms,Discrete Trigonometric Transforms
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