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This is a program to transform an image by an homography. The running time is proportional to the size of the output image. The basic usage is to extract a small crop from a huge image, and apply a small homography to the crop. The running time is independent of the size of the large image. This program is used inside the s2p satellite stereo pipeline http://github.com/cmla/s2p Right now the input image extraction is performed by gdal, but this dependency can be easily removed if needed, to use regular libtiff. HISTORY OF THIS CODE: Pascal Monasse: original algorithm for correct homographic resampling Gabriele Facciolo: improvements upon the original algorithm Marc Lebrun: optimized re-implementation of the C code using SIMD instructions Carlo de Franchis: interfaces to s2p Enric Meinhardt-Llopis: put this code in an individual github repository For a full git history and blame, look at the s2p commit history before the "c/homography" folder was removed from the tree.
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