[IMPORTANT]: fixed a bug in homography_cropper.py, affecting the precision of
the rectification process. The computed homographies were correct, but
incorrectly applied to images. To be applied, each homography is decomposed in
a translation + homography. The translation part is applied by doing a crop,
then the remaining homography is applied with the 'homography' binary, on the
previous crop. There was an issue with rounding the coordinates of the crop.