ITK  5.4.0
Insight Toolkit
SphinxExamples/src/Filtering/ImageFeature/DetectEdgesWithCannyEdgeDetectionFilter/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 # https://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 itk
18 import argparse
19 
20 parser = argparse.ArgumentParser(
21  description="Detect Edges With Canny Edge Detection Filter."
22 )
23 parser.add_argument("input_image")
24 parser.add_argument("output_image")
25 parser.add_argument("variance", type=float)
26 parser.add_argument("lower_threshold", type=float)
27 parser.add_argument("upper_threshold", type=float)
28 args = parser.parse_args()
29 
30 InputPixelType = itk.F
31 OutputPixelType = itk.UC
32 Dimension = 2
33 
34 InputImageType = itk.Image[InputPixelType, Dimension]
35 OutputImageType = itk.Image[OutputPixelType, Dimension]
36 
37 reader = itk.ImageFileReader[InputImageType].New()
38 reader.SetFileName(args.input_image)
39 
40 cannyFilter = itk.CannyEdgeDetectionImageFilter[InputImageType, InputImageType].New()
41 cannyFilter.SetInput(reader.GetOutput())
42 cannyFilter.SetVariance(args.variance)
43 cannyFilter.SetLowerThreshold(args.lower_threshold)
44 cannyFilter.SetUpperThreshold(args.upper_threshold)
45 
46 rescaler = itk.RescaleIntensityImageFilter[InputImageType, OutputImageType].New()
47 rescaler.SetInput(cannyFilter.GetOutput())
48 rescaler.SetOutputMinimum(0)
49 rescaler.SetOutputMaximum(255)
50 
51 writer = itk.ImageFileWriter[OutputImageType].New()
52 writer.SetFileName(args.output_image)
53 writer.SetInput(rescaler.GetOutput())
54 
55 writer.Update()
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:88
itk::CannyEdgeDetectionImageFilter
This filter is an implementation of a Canny edge detector for scalar-valued images.
Definition: itkCannyEdgeDetectionImageFilter.h:88
itk::RescaleIntensityImageFilter
Applies a linear transformation to the intensity levels of the input Image.
Definition: itkRescaleIntensityImageFilter.h:147
itk::Image
Templated n-dimensional image class.
Definition: itkImage.h:88
New
static Pointer New()