基于JPEG2000低内存低复杂度的图像编码算法  

An Algorithm of JPEG2000-Based Low Memory and Low Complexity Image Coding

作　　者：张宏伟[1] 刘正光[1] 陈红新[1] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072

出　　处：《天津大学学报》2006年第3期319-324,共6页Journal of Tianjin University(Science and Technology)

基　　金：天津市自然科学基金资助项目(023601011).

摘　　要：针对JPEG2000内存需求大、计算复杂度高等问题,提出了用提升格式实现的基于行的小波变换方法,以累进方式完成列向的小波变换,可在不影响变换结果的前提下降低对存储容量的需求;同时利用提升格式的特点, 进一步节省内存和加快计算速度．针对EBCOT算法3个通道编码、三次扫描操作浪费大量运算时间的情况,应用一次扫描完成3个通道编码操作的算法对其进行改进,不用重复形成上下文,大大减少了运算时间,并保持了 JPEG2000的优异性能．In view of the problems of the large memory requirement and the high computation complexity, JPEG2000, the line-based wavelet transform is proposed, which implemented by the lifting scheme. The column wavelet transform is performed progressively and lower memory is required without affecting the results of transform. Considering the perfect property of the lifting scheme, further reduction of memory and less computational cost can be achieved. According to embeded block coding with optimized truncation（EBCOT） algorithm, the coefficients in one bit plane are coded in three coding passes and the context scanning is performed three times, thus lots of operation time has been wasted. One scan method codes all the coefficients in one scan and avoids the context to be formed repeatedly, so it can improve the coding efficiency greatly besides keeping the excellent performance of JPEG2000.

关 键 词：图像编码 基于行的小波变换 提升格式 重要性状态 编码通道 

分 类 号：TN919.81[电子电信—通信与信息系统]