A Study of PSO and Powell Hybrid Algorithm Applied in Medical Image Registration
Feng Lin · Beijing shengwu yixue gongcheng · 2005
Image registration based on mutual information is of high automatization and high accuracy in registration. Hence, it has been widely exploited in medical image registration. Mutual information functions are often unsmooth. There are lots of local maximums, which abversely obstruct optimization algorithms. In this paper, features of mutual information functions are discussed and a hybrid algorithm combined by PSO and Powell is proposed. Experiments show that this hybrid algorithm could efficiently restrain local maximums of mutual information function.Also the registration accuracy could be improved to sub-pixel level.