机构地区: 中国科学技术大学计算机科学与技术学院
出 处: 《中国科学技术大学学报》 1998年第3期270-276,共7页
摘 要: 首先简要地介绍了用于图像处理的一维和二维Walsh变换的一种截断方法,然后根据图像操作的特点,着重介绍了用分块的方法在大规模分布存储并行机曙光-1000上的并行实现.用P个节点计算,在最坏情况下,NN的二维Walsh变换截断方法复杂度为O(N2logN/P),最好情况为O(N2/P).实验结果表明该方法十分快速、实用,易于并行处理,并有良好的可扩放性. This article first gives a brief introduction to a truncation method for computing one dimension and two dimension transforms with applications to image processing, then emphasizes the parallel implementation on MPP dawn1000 using the blocked method according to the characteristic of image operation. By computing the Walsh transforms of two dimension matrix of N*N with P nodes based on truncation methods, the complexity of O(N2logN2/P) under the worst circumstances, and the complexity of O(N2/P) under the best circumstances can be obtained. Experiment results show that this algorithm is very fast, practical, easily parallelprocessed, and has a good scalability.