def _compare_entropy(start_slice, end_slice, slice, difference):
"""
Calculate the entropy of two slices (from the start and end of an axis),
returning a tuple containing the amount that should be added to the start
and removed from the end of the axis.
"""
start_entropy = utils.image_entropy(start_slice)
end_entropy = utils.image_entropy(end_slice)
if end_entropy and abs(start_entropy / end_entropy - 1) < 0.01:
# Less than 1% difference, remove from both sides.
if difference >= slice * 2:
return slice, slice
half_slice = slice // 2
return half_slice, slice - half_slice
if start_entropy > end_entropy:
return 0, slice
else:
return slice, 0
def _compare_entropy(start_slice, end_slice, slice, difference):
"""
Calculate the entropy of two slices (from the start and end of an axis),
returning a tuple containing the amount that should be added to the start
and removed from the end of the axis.
"""
start_entropy = utils.image_entropy(start_slice)
end_entropy = utils.image_entropy(end_slice)
if end_entropy and abs(start_entropy / end_entropy - 1) < 0.01:
# Less than 1% difference, remove from both sides.
if difference >= slice * 2:
return slice, slice
half_slice = slice // 2
return half_slice, slice - half_slice
if start_entropy > end_entropy:
return 0, slice
else:
return slice, 0