unit test for rescaling code

[lionfish0]

When we get around to making unit tests, this would be one:

from btretrodetect import rescalePatch

def slowRescalePatch(im,x,y,patchSize,blocksize):
    a = im.repeat(blocksize,axis=0).repeat(blocksize,axis=1)
    return a[y-patchSize:y+patchSize,x-patchSize:x+patchSize]


im = np.random.randn(300,200)
for blocksize in [1,2,4,8]:
    for patchSize in [1,2,4,8,16,32]:
        for x in [101,160,54]:
            for y in [56,61,72]:
                im1 = slowRescalePatch(im,x,y,patchSize,blocksize)
                im2 = rescalePatch(im,x,y,patchSize,blocksize)
                assert np.all(im1==im2)