input : array_like
metric : {‘chessboard’, ‘taxicab’}, optional
The metric determines the type of chamfering that is done. If the
metric is equal to ‘taxicab’ a structure is generated using
generate_binary_structure with a squared distance equal to 1. If
the metric is equal to ‘chessboard’, a metric is generated
using generate_binary_structure with a squared distance equal to
the dimensionality of the array. These choices correspond to the
common interpretations of the ‘taxicab’ and the ‘chessboard’
distance metrics in two dimensions.
The default for metric is ‘chessboard’.
return_distances, return_indices : bool, optional
The return_distances, and return_indices flags can be used to
indicate if the distance transform, the feature transform, or both
must be returned.
If the feature transform is returned (return_indices=True),
the index of the closest background element is returned along
the first axis of the result.
The return_distances default is True, and the
return_indices default is False.
distances, indices : ndarrays of int32, optional
The distances and indices arguments can be used to give optional
output arrays that must be the same shape as input.
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