JPEG2000在空间太阳望远镜中的改进应用(英文)  

Improved Application of JPEG2000 to Image Compression on Space Solar Telescope

作　　者：谢华[1,2,3] Harald MICHALIK 金声震[2] 艾国祥[2] 

机构地区：[1]北京大学天文系 [2]中科院国家天文台,北京100012 [3]德国布伦瑞克技术大学计算机通信网络工程研究所,布伦瑞克38106

出　　处：《北京大学学报（自然科学版）》2006年第3期366-370,共5页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：国家863高技术基金(863-2.5.1.25);戴姆勒.奔驰基金(17-01/03)资助项目

摘　　要：对JPEG2000算法提出了一种新的改进,以提高它的编码效率。通过修改编码顺序,使得在每个Tile中,数据按照其重要性降序编码。从而,码流截断方法也随之简化,并可以提前终止编码,而率失真效果仍接近最优。最后,给出一个可行的并行化方案,可大大缩短运行时间。改进后的JPEG2000更适用于计算资源有限的星上系统,满足了空间太阳望远镜的压缩需求。A new coding and rate control method for JPEG2000 is proposed to improve its coding efficiency. Through modifying the coding order, the most important passes are coded first in a whole tile. Then, a simple data-stream truncation method is able to both terminate the coding in advance and approximate the optimal rate distortion. At the end, a feasible parallel implementation is proposed and it is to speed up JPEG2000 significantly. The improved algorithm makes JPEG2000 much more beneficial to applications with the restricted computing resource on board. The research satisfies the elementary requirements of image compression of Space Solar Telescope.

关 键 词：天文 图像压缩 信噪比 率控制 并行 

分 类 号：TH751[机械工程—仪器科学与技术]