计算机应用研究Issue(9)：2831-2834,2856,5.DOI:10.3969/j.issn.1001-3695.2015.09.064
基于码率预分配的嵌入式图像编码
Embedded image coding based on rate pre-allocation
摘要
Abstract
To resolve the problem that a large amount of data appeared in the rate control of EBCOT,this paper proposed a novel rate pre-allocation and feedback algorithm based on weighted control.First,it decomposed the original image by wave-let,then initially allocated the target rate according to the significant weight of subbands,and further optimized it by the visual coefficient or the depth of bit plane.It sorted each code block in the same subband according to the significant weight,a code block with large weight was priority and it controlled the coding accuracy by rate feedback.Experimental results prove that the proposed algorithm can pre-allocate bit rate accurately and reduce the calculation of encoder,increase the reduction rate of calculation 10%and the rate allocation efficiency more than 50%compared with RPFC algorithm.The algorithm can improve the peak signal to noise ratio of the reconstructed image 0.7 dB relative to the PCRD algorithm at low bit-rate.关键词
图像压缩/EBCOT/码率控制/码率预分配/权值优化Key words
image compression/EBCOT/rate control/rate pre-allocation/weight optimization分类
信息技术与安全科学引用本文复制引用
黄胜,翦伟,韩亮..基于码率预分配的嵌入式图像编码[J].计算机应用研究,2015,(9):2831-2834,2856,5.基金项目
国家自然科学基金资助项目（61171158，61275077）；重庆市自然科学基金项目（CSTC2013JCYJA40052，CSTC2012JJA40060）；重庆市教委科学技术研究项目 （）
