基于码率预分配的感兴趣区域编码算法

Journal of Systems Engineering and Electronics ›› 2009, Vol. 31 ›› Issue (4): 745-749.

基于码率预分配的感兴趣区域编码算法

雷杰, 孔繁锵, 吴成柯, 李云松

西安电子科技大学ISN国家重点实验室, 陕西, 西安, 710071

收稿日期:2007-11-09 修回日期:2008-08-26 出版日期:2009-04-20 发布日期:2010-01-03
作者简介:雷杰(1981- ),男,博士研究生,主要研究方向为图像处理与传输等.E-mail:jielei@mail.xidian.edu.cn
基金资助:
国家自然科学基金资助课题(60532060;60802076)

Algorithm for ROI coding based on rate pre-allocation

LEI Jie, KONG Fan-qiang, WU Cheng-ke, LI Yun-song

State Key Lab of ISN, Xidian Univ., Xi’an 710071, China

Received:2007-11-09 Revised:2008-08-26 Online:2009-04-20 Published:2010-01-03

摘要/Abstract

摘要： 为了有效降低传统感兴趣区域(ROI)编码算法的复杂度,提出一种基于码率预分配的感兴趣区域编码算法。算法优先对ROI进行T1编码,并截取控制ROI编码输出码率大小,实现有损到无损的ROI编码。使用基于熵估计的码率预分配方法,确定背景区域(BG)所属码块的码率,并据此控制BG码块的T1编码深度,简化编码过程。实验结果表明,算法与比特平面提升和率失真斜率提升的ROI编码算法相比,大幅度减少计算量和存储量,适合硬件实现。

Abstract: In order to decrease the complexity of the traditional algorithm for ROI coding,a new algorithm based on rate pre-allocation is proposed.The code block of ROI is primarily encoded,and its coding stream length is controlled to implement from lossy to lossless ROI coding.Certain bytes are allocated to each block of background regions(BG) according to their entropy value.In the light of the allocated rate,T1 coding process on the block of BG can be real-time terminated.As a result,the whole coding process is simplified.The experimental results show that the proposed scheme can efficiently reduce the cost of computation and memory usage compared with the bit-plane lifting and rate-distortion slope lifting ROI coding methods,which is suitable for implementation in hardware.

中图分类号:

TN919.81

雷杰, 孔繁锵, 吴成柯, 李云松. 基于码率预分配的感兴趣区域编码算法[J]. Journal of Systems Engineering and Electronics, 2009, 31(4): 745-749.

LEI Jie, KONG Fan-qiang, WU Cheng-ke, LI Yun-song. Algorithm for ROI coding based on rate pre-allocation[J]. Journal of Systems Engineering and Electronics, 2009, 31(4): 745-749.