psf_utils.rescale_kernel: fix for negative shifts
#177
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Spot on. Thanks! How did you come across this bug? |
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In
psf_utils.rescale_kernel(), the shiftsdxanddytypically have small absolute values. When a shift is negative, e.g.dy = -1, the previous code cuts the image toimage[:2*abs(dy), :], i.e.image[:2, ]. This makes the image very narrow in the y direction... The intended functionality is to cut 2 rows from the top, this is achieved by the new codeimage[:2*dy, :], i.e.image[:-2, :]. The x direction was also wrong for negativedx, the current code is symmetric in both directions.