How to set minimum step size in optimizer for image registration?
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I am solving a registration type problem where I know my images can be apart by large parameter values (perhaps, up to 20 pixel shift, 0.5 scaling factor and 30 degrees). When I use an optimizer, it takes sub-pixel steps and ends up in a minimum that is (or rounds off to) my original guess. Is there a way to set the step size to e.g. 1 pixel, 1 degree etc? I am trying to use fminsearch but do have the optimization toolbox.
Also, is it possible to pass images to the optimizing function without doing file reads/writes?
Thank you, Bogdan