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基于预测的JPEG2000码率控制算法

Prediction based JPEG2000 rate control algorithm
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摘要 在低码率下JPEG2000的压缩后率失真最优化算法(PCRD-opt)在运算量和存储量上冗余较大。针对这一问题,该文提出一种基于预测的码率控制算法。该算法通过对目标码率所对应的率失真斜率进行预测,提前截断块编码,避免不必要的编码扫描过程,从而有效降低了运算量和存储量,同时保持图像的质量。在目标码率为0.1 bit/像素时,与PCRD-opt相比,本算法Tier-1层块编码部分的运算时间和存储空间各减少了大约90%,而峰值信噪比(PSNR)基本没有降低。 The conventional post-compression optimization (PCRD-opt) scheme in JPEG2000 does rate-distortion not efficiently use the computational power and working memory when the target bit-rate is low. A prediction based JPEG2000 rate control algorithm is proposed to avoid unnecessary coding pass by predicting the rate-distortion slope with given target bit-rate and stopping block coding in advance. The computations and memory usage is reduced efficiently without sacrificing the image quality therefore. At a bit rate of 0.1 bit per pixel, the computational complexity and working memory of Tier-1 coding is reduced by up to 90% compared with PCRD-opt, with no reduction in the peak signal-to-noise (PSNR).
出处 《清华大学学报(自然科学版)》 EI CAS CSCD 北大核心 2010年第1期125-128,共4页 Journal of Tsinghua University(Science and Technology)
基金 国家自然科学基金资助项目(60572081)
关键词 JPEG2000 码率控制 率失真优化 JPEG2000 rate control rate-distortion optimization
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参考文献9

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