截断点可行性化的率失真优化算法
doi: 10.3724/SP.J.1146.2007.01599
A Feasibility Strategy of Truncation Points for Rate Distortion Optimality
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摘要: 该文提出了截断点可行性化的率失真优化算法，该算法根据率失真斜率最陡下降准则对精细编码过程相关联的截断点进行重新排序。新算法较JPEG2000减少了超过50%的非可行性截断点；获得比JPEG2000更精细的嵌入式比特流；相同的压缩比下重建图像的PSNR比JPEG2000高0.1dB~0.2dB；耗费的比特平面位编码时间少于JPEG2000。Abstract: A feasibility strategy of truncation points for rate distortion optimality is presented. The new algorithm reorders the positions of truncation points associated with refinement passes according to the steepest rate-distortion slope. The proposed scheme reduces the unfeasible truncation points to 50% compared with JPEG2000; gives a finely embedded bitstream, achieves an improvement of PSNR over JPEG2000 0.1dB~0.2dB, and attains a speed-up of the bit-plane encode time compared with JPEG2000.
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