def get_drift(i, j, _images):
'''Returns the drift of imagej compared to image i'''
cc_img = cc.perform_correlation(_images[i], _images[j])
offset = cc.get_drift(cc_img)
''' DEBUG
print 'Reference: %s at index %i' % (images[i],i)
print 'Drifted image: %s at index %i' % (images[j],j)
print 'Offset: %d,%d\n' % offset
'''
return offset
