ITK  5.2.0
Insight Toolkit
SphinxExamples/src/Core/Common/ApplyAFilterOnlyToASpecifiedRegionOfAnImage/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 itk
18 
19 Dimension = 2
20 PixelType = itk.F
21 ImageType = itk.Image[PixelType, Dimension]
22 
23 smallSize = itk.Size[Dimension]()
24 smallSize.Fill(10)
25 
26 index = itk.Index[Dimension]()
27 index.Fill(0)
28 
29 region = itk.ImageRegion[Dimension]()
30 region.SetIndex(index)
31 region.SetSize(smallSize)
32 
33 bigSize = itk.Size[Dimension]()
34 bigSize.Fill(10)
35 
36 RandomSourceType = itk.RandomImageSource[ImageType]
37 randomImageSource = RandomSourceType.New()
38 randomImageSource.SetNumberOfWorkUnits(1) # to produce non-random results
39 randomImageSource.SetSize(bigSize)
40 randomImageSource.GetOutput().SetRequestedRegion(region)
41 
42 print("Created random image.")
43 
44 DerivativeImageFilterType = itk.DerivativeImageFilter[ImageType, ImageType]
45 
46 derivativeFilter = DerivativeImageFilterType.New()
47 derivativeFilter.SetInput(randomImageSource.GetOutput())
48 derivativeFilter.SetDirection(0) # "x" axis
49 derivativeFilter.GetOutput().SetRequestedRegion(region)
50 derivativeFilter.Update()
51 
52 print("Computed derivative.")
itk::Index
Represent a n-dimensional index in a n-dimensional image.
Definition: itkIndex.h:66
itk::Size
Represent a n-dimensional size (bounds) of a n-dimensional image.
Definition: itkSize.h:69
itk::ImageRegion
An image region represents a structured region of data.
Definition: itkImageRegion.h:69
itk::DerivativeImageFilter
Computes the directional derivative of an image. The directional derivative at each pixel location is...
Definition: itkDerivativeImageFilter.h:50
itk::RandomImageSource
Generate an n-dimensional image of random pixel values.
Definition: itkRandomImageSource.h:55
itk::Image
Templated n-dimensional image class.
Definition: itkImage.h:86