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In this paper, we present an arbitrary shape matching (ASM) coding technique for screen contents. In ASM coder, a Coding Unit (CU) is broken into multiple pixel sample strings. Each string called matched string in the CU has a matching string in the previously coded and reconstructed pixel buffer. Then the distance (either 1D or 2D) between the matching string and matched string and the length of...
This paper proposes a compound image compression method named United Coding (UC). In this coding method, several lossless coding techniques such as run-length encoding (RLE), Portable Network Graphics (PNG) and gzip are combined into H.264 hybrid coding, and macroblock is the basic coding unit. All coders in UC are used to code each macroblock, and rate-distortion (R-D) optimization criterion is applied...
This paper proposes a Unified LZ and Hybrid Coding (ULHC) method for compound image and video compression. The method is macroblock-based. Each macroblock is first coded simultaneously by both H.264 and gzip, then rate-distortion optimization is used to select either H.264 coding or gzip coding as the final coding of the macroblock. To improve the compression performance of ULHC, gzip uses the most...
This paper studies the idempotence of H.264 intraframe multi-generation coding. We analyze the H.264 transform and quantization and reveal that for some quantization parameters there always exists at least one clipping compensation matrix to make the H.264 intraframe multi-generation coding idempotent as long as the same prediction mode and the same quantization parameter are selected for each coding...
In H.264, Intra prediction is employed to reduce energy of prediction error to be transmitted. Because the order of Intra frame encoding is from left to right horizontally and from top to bottom vertically, intra prediction reference pels can only appear on the left side or upside of the block to be predicted, so predicted results are not ideal sometimes. In this paper, a new intra 4 times 4 prediction...
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