SphinxExamples/src/Filtering/BinaryMathematicalMorphology/ErodeABinaryImage/Code.py

#!/usr/bin/env python
 
# Copyright NumFOCUS
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#        https://www.apache.org/licenses/LICENSE-2.0.txt
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
 
import itk
import argparse
 
parser = argparse.ArgumentParser(description="Erode A Binary Image.")
parser.add_argument("input_image")
parser.add_argument("output_image")
parser.add_argument("radius", type=int)
args = parser.parse_args()
 
PixelType = itk.UC
Dimension = 2
 
ImageType = itk.Image[PixelType, Dimension]
 
ReaderType = itk.ImageFileReader[ImageType]
reader = ReaderType.New()
reader.SetFileName(args.input_image)
 
StructuringElementType = itk.FlatStructuringElement[Dimension]
structuringElement = StructuringElementType.Ball(args.radius)
 
ErodeFilterType = itk.BinaryErodeImageFilter[
    ImageType, ImageType, StructuringElementType
]
erodeFilter = ErodeFilterType.New()
erodeFilter.SetInput(reader.GetOutput())
erodeFilter.SetKernel(structuringElement)
erodeFilter.SetForegroundValue(255)  # Intensity value to erode
erodeFilter.SetBackgroundValue(0)  # Replacement value for eroded voxels
 
WriterType = itk.ImageFileWriter[ImageType]
writer = WriterType.New()
writer.SetFileName(args.output_image)
writer.SetInput(erodeFilter.GetOutput())
 
writer.Update()