一种新的基于率失真优化的感兴趣区域编码  

New ROI coding algorithm based on rate-distortion optimization

作　　者：潘玉[1] 郭宝龙[1] 丁贵广[1] 

机构地区：[1]西安电子科技大学机电工程学院,陕西西安710071

出　　处：《计算机应用》2005年第1期106-109,共4页journal of Computer Applications

基　　金：国家自然科学基金资助项目(69975015);教育部优秀青年教师资助计划

摘　　要：根据EBCOT编码中率失真优化截取算法的特点,,结合最大位移法提出了以提升率失真斜率来实现任意形状ROI优先编码的方法(DRshift法)。该方法提升的对象是ROI的失真斜率,而非ROI系数,从而避免了最大位移法(Maxshift)中引入过多的位平面导致的编码效率降低的问题。实验结果表明,该算法可在接收到图像的全部编码数据之前,优先实现任意形状的感兴趣区域的高品质重建,提高了编码效率,并且,通过改变提升因子的大小可实现感兴趣区域与背景区域重建图像质量的灵活可调。According to the Rate distortion optimization of EBCOT, and combined with the Maxshift method, an improved region-of-interest(ROI) method was proposed. By shifting the corresponding distortion-rate slopes instead of the corresponding ROT coefficients in Maxshift, this method avoided the coding efficiency defects caused by increased bit-plans in Maxshift. It could reconstruct the arbitrarily shaped ROI image with higher quality without receiving the entire image and improve the efficiency of coding. Besides, the new method enabled the flexible adjustment of compression quality in ROI and background. Experiments indicate its efficiency.

关 键 词：JPEG2000 感兴趣区域 最大位移法 率失真优化 EBCOT编码 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]