A hardware-accelerated approach to computing multiple image similarity measures from joint histogram

Carlos R. Castro-Pareja; Raj Shekhar

doi:10.1117/12.643206

15 February 2006 A hardware-accelerated approach to computing multiple image similarity measures from joint histogram

Proceedings Volume 6063, Real-Time Image Processing 2006; 60630N (2006) https://doi.org/10.1117/12.643206
Event: Electronic Imaging 2006, 2006, San Jose, California, United States

Abstract

Image similarity-based image registration is an iterative process that, depending on the number of degrees of freedom in the underlying transformation, may require hundreds to tens of thousands of image similarity computations to converge on a solution. Computation time often limits the use of such algorithms in real-life applications. We have previously shown that hardware acceleration can significantly reduce the time required to register two images. However, the hardware architectures we presented were limited to mutual information calculation, which is one of several commonly used image similarity measures. In this article we show how our architecture can be adapted for the calculation of other image similarity measures in approximately the same time and using the same hardware resources as those for the mutual information case. As in the case of mutual information calculation, the joint histogram is calculated as a first step. The image similarity measures considered are mutual information, normalized mutual information, normalized cross correlation, mean-square sum of differences and ratio image uniformity. We show how all these image similarities can be calculated from the joint histogram in a small fraction of the time required to calculate the joint histogram itself.

Citation Download Citation

Carlos R. Castro-Pareja and Raj Shekhar "A hardware-accelerated approach to computing multiple image similarity measures from joint histogram", Proc. SPIE 6063, Real-Time Image Processing 2006, 60630N (15 February 2006); https://doi.org/10.1117/12.643206

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KEYWORDS

Image registration

Iris

Image processing

Image restoration

Surgery

Computed tomography

Field programmable gate arrays

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