基于OpenMP的并行图像相减算法实现与分析  

Implementation and Analysis of an OpenMP-Based Parallel Differential-Photometry Algorithm

作　　者：李继良[1] 于策[1] 孙济洲[1] 商朝晖[2] 陈锦言[1] 曹玮[1] 张旭明[1] 

机构地区：[1]天津大学,天津300072 [2]天津师范大学,天津300387

出　　处：《天文研究与技术》2011年第2期146-152,共7页Astronomical Research & Technology

基　　金：国家自然科学基金(10978016);天津市科技支撑计划重点项目(09ZCKFGX00400);天津市应用基础及前沿技术研究计划重点项目(08JCZDJC19700)资助

摘　　要：图像相减是一种精确地获得密集星体区域中变星的相对光度变化的技术,其基本原理为通过同一区域不同时间的图像间差异来获得该区域的时间变化信息。传统上图像相减变源测光算法只有串行性算法,计算效率不高。讨论了图像相减测光算法的基本原理,在开源软件ISIS基础上提出了一个基于OpenMP技术的图像相减算法的可靠并行化实现,提高了程序运行的效率。Differential-photonletry is a technique for obtaining precise relative photometry of variable sources in crowded stellar fields. Its basic principle is to derive temporal photometric variations of objects by subtracting images of the same region recorded at different moments after eonvolved by a kernel. Traditional image-subtraction algorithms for differential photometry use serial computing and are low in efficiency. This paper discusses the principle of differential photometry and gives a reliable parallel-computing algorithm of differential photometry based on the OpenMP technology and the open-source software ISIS. The algorithm significantly increases the efficiency.

关 键 词：图像相减算法 并行化实现 OPENMP 最优图像相减 AST3 

分 类 号：P141.2[天文地球—天体物理]