Fast Subpixel Image Registration
نویسنده
چکیده
A fast new block-matching image registration algorithm is proposed and tested through simulation. It first finds the relative image displacement to the nearest pixel by searching within a rectangular window using logarithmicallydecreasing step sizes. It then refines the displacement estimate to subpixel accuracy through bilinear interpolation of the sum-ofabsolute-differences block error metric. Mean estimation errors (defined as Euclidean distance between estimated displacement and ground truth) of the order of 0.5% of the pixel pitch are achieved for low-noise natural images larger than 300000 pixels.
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