# ==========================================================================
#
#   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 InsightToolkit as itk
import sys

reader = itk.itkImageFileReaderF2_New()
reader.SetFileName(sys.argv[1])

diffusion = itk.itkGradientAnisotropicDiffusionImageFilterF2F2_New()
diffusion.SetInput(reader.GetOutput())
diffusion.SetTimeStep(0.0625)
diffusion.SetConductanceParameter(9.0)
diffusion.SetNumberOfIterations(5)

gradient = itk.itkGradientMagnitudeImageFilterF2F2_New()
gradient.SetInput(diffusion.GetOutput())

watershed = itk.itkWatershedImageFilterF2_New()
watershed.SetInput(gradient.GetOutput())
watershed.SetThreshold(0.01)
watershed.SetLevel(0.2)

writer = itk.itkImageFileWriterUL2_New()
writer.SetFileName(sys.argv[2])
writer.SetInput(watershed.GetOutput())
writer.Update()
