In High Efficiency Video coding, the Residual Quad-Yree （RQT） coding is used to encode the prediction residual for both intra and inter coding Units （CU） and provides improved coding gains. However, this results i...
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In High Efficiency Video coding, the Residual Quad-Yree （RQT） coding is used to encode the prediction residual for both intra and inter coding Units （CU） and provides improved coding gains. However, this results in much higher computational complexities. To address this problem, we develop two fast RQT algorithms for intra- and inter-prediction residual coding respectively. For intra coding, the proposed algorithm selects the best prediction mode in the rate distortion mode decision process using a Prediction Unit （PU） size-dependent fast RQT depth decision on a reduced prediction mode candidates set from the rough mode decision process. For inter coding, in addition to CU size-dependent fast RQT depth decisions, we propose a discriminant analy- sis-based fast depth decision algorithm to det- ermine the best transform unit size. Experimental results show that on average, we can real- ise a 21.29% encoding time saving and 0.03% bit-rate reduction for intra coding, while 15% of the encoding time can be saved with a negligible coding performance loss for inter coding.
In comparison with H.264/AVC, the newest video coding standard, High Efficiency Video coding (HEVC), improves video coding rate distortion (RD) performance, but at the price of significant increase in its encoding com...
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ISBN:
(纸本)9781479983407
In comparison with H.264/AVC, the newest video coding standard, High Efficiency Video coding (HEVC), improves video coding rate distortion (RD) performance, but at the price of significant increase in its encoding complexity, due to its complicated inter mode decision process. In HEVC inter coding, the actual RD costs of all combinations of coding units (CUs), prediction units (PUs), and transform units (TUs) have to be computed and then the combination (i.e., mode) with the minimum cost is selected and encoded. To reduce the inter mode decision complexity in HEVC while maintaining its coding efficiency, in this paper, a fast inter mode decision method based on a newly proposed Transparent Composite Model (TCM) is developed. Spatially and temporally homogeneities are identified by TCM, and then used, together with spatiotemporal correlation between CUs, to determine PU and CU partitions so that cost computations of unnecessary modes can be skipped. Experimental results show that, for the low delay main test configuration of HEVC, our method reduces, on average, the encoding time by 60.71% with an insignificant loss in coding efficiency (1.06% BD-Rate increase).
Different data hiding methods would be required in different operating *** improve the quality of videos embedded by data,this paper will apply the differences of matching blocks in the H.264 encoder during the inter ...
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Different data hiding methods would be required in different operating *** improve the quality of videos embedded by data,this paper will apply the differences of matching blocks in the H.264 encoder during the inter prediction stage and enforce the size of the matching blocks to implement data *** rate increases after being embedded by data,to resolve the problem,this paper will mainly make use of the method of modifying the trailing coefficients sign-bit of fixed-length coding to control the bit rate in Context Adaptive Variable Length coding(CAVLC).To equipoise the quality and bit rate of videos,this paper proposes an algorithm that embeds data separately in both of these two coding blocks.
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