ITK  5.2.0
Insight Toolkit
SphinxExamples/src/Filtering/Thresholding/ThresholdAnImageUsingOtsu/Code.py
1 #!/usr/bin/env python
2 
3 # Copyright NumFOCUS
4 #
5 # Licensed under the Apache License, Version 2.0 (the "License");
6 # you may not use this file except in compliance with the License.
7 # You may obtain a copy of the License at
8 #
9 # http://www.apache.org/licenses/LICENSE-2.0.txt
10 #
11 # Unless required by applicable law or agreed to in writing, software
12 # distributed under the License is distributed on an "AS IS" BASIS,
13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 # See the License for the specific language governing permissions and
15 # limitations under the License.
16 
17 import sys
18 import itk
19 
20 if len(sys.argv) != 6:
21  print("Usage: " + sys.argv[0] + " <inputImage> <outputImage> "
22  "<numberOfHistogramBins> <numberOfThresholds> <labelOffset>")
23  sys.exit(1)
24 
25 inputImage = sys.argv[1]
26 outputImage = sys.argv[2]
27 numberOfHistogramBins = int(sys.argv[3])
28 numberOfThresholds = int(sys.argv[4])
29 labelOffset = int(sys.argv[5])
30 
31 PixelType = itk.UC
32 Dimension = 2
33 
34 ImageType = itk.Image[PixelType, Dimension]
35 
36 reader = itk.ImageFileReader[ImageType].New()
37 reader.SetFileName(inputImage)
38 
40  ImageType,
41  ImageType].New()
42 thresholdFilter.SetInput(reader.GetOutput())
43 
44 thresholdFilter.SetNumberOfHistogramBins(numberOfHistogramBins)
45 thresholdFilter.SetNumberOfThresholds(numberOfThresholds)
46 thresholdFilter.SetLabelOffset(labelOffset)
47 
48 rescaler = itk.RescaleIntensityImageFilter[ImageType, ImageType].New()
49 rescaler.SetInput(thresholdFilter.GetOutput())
50 rescaler.SetOutputMinimum(0)
51 rescaler.SetOutputMaximum(255)
52 
53 writer = itk.ImageFileWriter[ImageType].New()
54 writer.SetFileName(outputImage)
55 writer.SetInput(rescaler.GetOutput())
56 
57 writer.Update()
itk::OtsuMultipleThresholdsImageFilter
Threshold an image using multiple Otsu Thresholds.
Definition: itkOtsuMultipleThresholdsImageFilter.h:61
itk::ImageFileReader
Data source that reads image data from a single file.
Definition: itkImageFileReader.h:75
itk::ImageFileWriter
Writes image data to a single file.
Definition: itkImageFileWriter.h:87
itk::RescaleIntensityImageFilter
Applies a linear transformation to the intensity levels of the input Image.
Definition: itkRescaleIntensityImageFilter.h:154
itk::Image
Templated n-dimensional image class.
Definition: itkImage.h:86