def grey_dilation(input, size = None, footprint = None, structure = None,
output = None, mode = "reflect", cval = 0.0, origin = 0):
"""Calculate a grey values dilation.
Either a size or a footprint, or the structure must be
provided. An output array can optionally be provided. The origin
parameter controls the placement of the filter. The mode parameter
determines how the array borders are handled, where cval is the
value when mode is equal to 'constant'.
"""
if structure is not None:
structure = numpy.asarray(structure)
structure = structure[tuple([slice(None, None, -1)] *
structure.ndim)]
if footprint is not None:
footprint = numpy.asarray(footprint)
footprint = footprint[tuple([slice(None, None, -1)] *
footprint.ndim)]
input = numpy.asarray(input)
origin = _ni_support._normalize_sequence(origin, input.ndim)
for ii in range(len(origin)):
origin[ii] = -origin[ii]
if footprint is not None:
sz = footprint.shape[ii]
else:
sz = size[ii]
if not sz & 1:
origin[ii] -= 1
return filters._min_or_max_filter(input, size, footprint, structure,
output, mode, cval, origin, 0)
def grey_dilation(input,
size=None,
footprint=None,
structure=None,
output=None,
mode="reflect",
cval=0.0,
origin=0):
"""Calculate a grey values dilation.
Either a size or a footprint, or the structure must be
provided. An output array can optionally be provided. The origin
parameter controls the placement of the filter. The mode parameter
determines how the array borders are handled, where cval is the
value when mode is equal to 'constant'.
"""
if structure is not None:
structure = numpy.asarray(structure)
structure = structure[tuple([slice(None, None, -1)] * structure.ndim)]
if footprint is not None:
footprint = numpy.asarray(footprint)
footprint = footprint[tuple([slice(None, None, -1)] * footprint.ndim)]
input = numpy.asarray(input)
origin = _ni_support._normalize_sequence(origin, input.ndim)
for ii in range(len(origin)):
origin[ii] = -origin[ii]
if footprint is not None:
sz = footprint.shape[ii]
else:
sz = size[ii]
if not sz & 1:
origin[ii] -= 1
return filters._min_or_max_filter(input, size, footprint, structure,
output, mode, cval, origin, 0)
def grey_erosion(input, size = None, footprint = None, structure = None,
output = None, mode = "reflect", cval = 0.0, origin = 0):
"""Calculate a grey values erosion.
Either a size or a footprint, or the structure must be provided. An
output array can optionally be provided. The origin parameter
controls the placement of the filter. The mode parameter
determines how the array borders are handled, where cval is the
value when mode is equal to 'constant'.
"""
return filters._min_or_max_filter(input, size, footprint, structure,
output, mode, cval, origin, 1)
def grey_erosion(input,
size=None,
footprint=None,
structure=None,
output=None,
mode="reflect",
cval=0.0,
origin=0):
"""Calculate a grey values erosion.
Either a size or a footprint, or the structure must be provided. An
output array can optionally be provided. The origin parameter
controls the placement of the filter. The mode parameter
determines how the array borders are handled, where cval is the
value when mode is equal to 'constant'.
"""
return filters._min_or_max_filter(input, size, footprint, structure,
output, mode, cval, origin, 1)
