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Palette mode is one of the major coding tools for the Screen Content Coding (SCC) extension to HEVC standard. On the other hand, as the parallel computing capability explosively grows in recent computing industry, people are exploring the possibility of parallelism as much as possible, to achieve video codec products with higher speed and larger throughput. However, the newly introduced palette technology...
During Coefficient thresholding (CT), the last several nonzero DCT coefficients after quantization are dropped if better Rate-Distortion (RD) performance can be achieved. Since image data can be reconstructed by incomplete frequency information with some prior knowledge of image property (e.g., luminance continuity), the quality degradation caused by CT can be sometimes alleviated by some prior knowledge...
A Pattern-based Assembled DCT (PADCT) scheme is proposed to fully utilize textual structure in images in a more flexible manner. Different patterns can be designed or extracted according to texture structures such as directionality and distribution patterns. Pixels in the block are divided into sub-partitions, followed by assembling pixels in each sub-partition together before the succeeding transformations...
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