基于码率预分配的JPEG2000自适应率控制算法

孔繁锵; 李云松; 王柯俨; 庄怀宇

doi:10.3724/SP.J.1146.2007.01135

基于码率预分配的JPEG2000自适应率控制算法

doi: 10.3724/SP.J.1146.2007.01135

基金项目:

国家自然科学基金重点项目(60532060)和国家自然科学基金项目(60507012)资助项目

计量
- 文章访问数: 3161
- HTML全文浏览量: 99
- PDF下载量: 923
- 被引次数: 0
出版历程
- 收稿日期: 2007-07-03
- 修回日期: 2007-12-31
- 刊出日期: 2009-01-19

An Adaptive Rate Control Algorithm for JPEG2000 Based on Rate Pre-allocation

摘要

摘要: 该文提出一种基于码率预分配和反馈控制的自适应率控制算法。算法引入了预测模板，对图像小波变换和量化后EBCOT编码码块的有效比特平面进行独立的熵估计，并以码块估计熵总和指导码率预分配，同时T2编码器由预分配编码比特率自适应地反馈控制编码深度、完成优化截取。实验结果表明，该算法码率分配精确，并有效地减少了编码器计算量和存储量，提高了编码效率，算法复杂度低，易于硬件实现。
- 图像压缩;率控制;码率分配;熵估计
Abstract: A novel scheme for JPEG2000 adaptive rate control is proposed based on rate pre-allocation and feedback control. After wavelet transform and quantification, a prediction module is introduced to estimate the entropy of EBCOT code block within available bit plane, then using the summation estimate entropy of each code block to allocate the rate for each code block. T2 encoder sends feedback to control the coding depth by the pre-allocation bit rate and complete the rate-distortion optimization truncation. The experimental results show that the proposed scheme can efficiently reduce the cost of computation and memory usage, which is suitable for hardware implementation with low computation.

HTML全文

参考文献(1)

JPEG 2000 Part I Final Committee Draft Version 1.0.ISO/IEC JTC1/SC29/WG1 N1646R, March 2000.[2]Taubman D. High performance scalable image compressionwith EBCOT [J].IEEE Trans. on Image Processing.2000,9(7):1158-1170[3]Lian C J, Chen K F, and Chen H H, et al.. Analysis andarchitecture design of block-coding engine for EBCOT inJPEG2000 [J].IEEE Trans. on Circuits and Systems forVideo Technology.2003, 13(3):219-230[4]Yeung Y M and Au O C. Efficient rate control for JPEG2000image coding [J].IEEE Trans. on Circuits and Systems forVideo Technology.2005, 15(3):335-344[5]吴宗泽, 郑南宁, 黄宇等. 基于编码通道数的JPEG2000 压缩率控制算法[J]. 西安交通大学学报, 2004, 38(12): 1216-1219.Wu Zong-ze, Zheng Nan-ning, and Huang Yu, et al.. Newcompression ratio pre-dispensation algorithm for multi-tilesimages in JPEG2000 [J]. Journal of Xian JiaoTongUniversity, 2004, 38(12): 1216-1219.[6]吴宗泽, 郑南宁, 黄宇等. JPEG2000 实时截断码率控制新算法及其VLSI 结构设计[J]. 电子学报, 2005, 33(8): 1457-1460.Wu Zhong-ze, Zheng Nan-ning, Huang Yu, et al. New ratecontrol algorithm truncating real time for JPEG2000 and itsVLSI architecture design [J]. Acta Electronica Sinica, 2005,33(8): 1457-1460.[7]庄怀宇, 李云松, 吴成柯等. 基于重要性权值的自适应率控制算法[J]. 电子学报, 2005, 33(10): 1863-1866.Zhuang H Y, Li Y S, Wu C K, et al. An adaptive rate controlalgorithm based on significant priority [J]. Acta ElectronicaSinica, 2005, 33(10): 1863-1866.[8]Kim T, Kim H M, and Tsai P S, et al.. Memory efficientprogressive rate-distortion algorithm for JPEG2000 [J].IEEETrans. on Circuits and Systems for Video Technology.2005,15(1):181-187[9]ISO/ IEC 14495-1-1998, Information Technology Losslessand Near-Lossless Compression of Continuous Tone StillImages Baseline.

施引文献

资源附件(0)

访问统计