SphinxExamples/src/Filtering/ImageGradient/ComputeGradientMagnitudeRecursiveGaussian/Code.py

#!/usr/bin/env python

#==========================================================================
#
#   Copyright Insight Software Consortium
#
#   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
#
#          http://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 sys
import itk

if len(sys.argv) != 3:
    print("Usage: " + sys.argv[0] + " <inputImage> <outputImage> ")
    sys.exit(1)

inputImage = sys.argv[1]
outputImage = sys.argv[2]

InputPixelType = itk.UC
OutputPixelType = itk.F
Dimension = 2

InputImageType = itk.Image[InputPixelType, Dimension]
OutputImageType = itk.Image[OutputPixelType, Dimension]

ReaderType = itk.ImageFileReader[InputImageType]
reader = ReaderType.New()
reader.SetFileName(inputImage)

FilterType = itk.GradientMagnitudeImageFilter[InputImageType, InputImageType]
gradientMagnitudeImageFilter = FilterType.New()
gradientMagnitudeImageFilter.SetInput(reader.GetOutput())

WriterType = itk.ImageFileWriter[OutputImageType]
writer = WriterType.New()
writer.SetFileName(outputImage)
writer.SetInput(gradientMagnitudeImageFilter.GetOutput())

writer.Update()