In our case, we are going to register the shifting between two images, doing the first approach by FFT based correlation, and later doing the subpixel approach using the technique described before. We consider it as ‘brute force’ method. So we will present a benchmark of the algorithm consisting on a first approach (pixel resolution) and then do subpixel resolution approaching, decreasing the shifting step in every loop achieving a high resolution in few steps. This program will be executed in three different computers. At the end, we will present the results of the computation, with different kind of CPUs and GPUs, checking the accuracy of the method, and the time consumed in each computer, discussing the advantages, disadvantages of the use of GPUs.
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Martin Sanz-Sabater, Jose Angel Picazo-Bueno, Vicente Micó, Carlos Ferrerira, Luis Granero, Javier Garcia, "GPUs benchmarking in subpixel image registration algorithm," Proc. SPIE 9525, Optical Measurement Systems for Industrial Inspection IX, 95253X (22 June 2015);