def computeDerivatives(im1, im2):
fx = filter2(im1,kernelX) + filter2(im2,kernelX)
fy = filter2(im1,kernelY) + filter2(im2,kernelY)
# ft = im2 - im1
ft = filter2(im1,kernelT) + filter2(im2,-kernelT)
return fx,fy,ft
#%%
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