ITK  4.8.0
Insight Segmentation and Registration Toolkit
SphinxExamples/src/Filtering/ImageFeature/DetectEdgesWithCannyFilter/Code.py
1 #!/usr/bin/env python
2 
3 #==========================================================================
4 #
5 # Copyright Insight Software Consortium
6 #
7 # Licensed under the Apache License, Version 2.0 (the "License");
8 # you may not use this file except in compliance with the License.
9 # You may obtain a copy of the License at
10 #
11 # http://www.apache.org/licenses/LICENSE-2.0.txt
12 #
13 # Unless required by applicable law or agreed to in writing, software
14 # distributed under the License is distributed on an "AS IS" BASIS,
15 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 # See the License for the specific language governing permissions and
17 # limitations under the License.
18 #
19 #==========================================================================*/
20 
21 import sys
22 import itk
23 
24 if len(sys.argv) != 6:
25  print("Usage: " + sys.argv[0] + " <inputImage> <outputImage> "
26  "<variance> <lowerThreshold> <upperThreshold>")
27  sys.exit(1)
28 
29 inputImage = sys.argv[1]
30 outputImage = sys.argv[2]
31 variance = int(sys.argv[3])
32 lowerThreshold = int(sys.argv[4])
33 upperThreshold = int(sys.argv[5])
34 
35 InputPixelType = itk.F
36 OutputPixelType = itk.UC
37 Dimension = 2
38 
39 InputImageType = itk.Image[InputPixelType, Dimension]
40 OutputImageType = itk.Image[OutputPixelType, Dimension]
41 
42 ReaderType = itk.ImageFileReader[InputImageType]
43 reader = ReaderType.New()
44 reader.SetFileName(inputImage)
45 
46 FilterType = itk.CannyEdgeDetectionImageFilter[InputImageType, InputImageType]
47 cannyFilter = FilterType.New()
48 
49 cannyFilter.SetInput(reader.GetOutput())
50 cannyFilter.SetVariance(variance)
51 cannyFilter.SetLowerThreshold(lowerThreshold)
52 cannyFilter.SetUpperThreshold(upperThreshold)
53 
54 RescaleFilterType = itk.RescaleIntensityImageFilter[
55  InputImageType,
56  OutputImageType]
57 rescaler = RescaleFilterType.New()
58 rescaler.SetInput(cannyFilter.GetOutput())
59 rescaler.SetOutputMinimum(0)
60 rescaler.SetOutputMaximum(255)
61 
62 WriterType = itk.ImageFileWriter[OutputImageType]
63 writer = WriterType.New()
64 writer.SetFileName(outputImage)
65 writer.SetInput(rescaler.GetOutput())
66 
67 writer.Update()