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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* 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
*
* http://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.
*
*=========================================================================*/
#include "itkGradientToMagnitudeImageFilter.h"
#include "itkImageRegionIterator.h"
int itkGradientToMagnitudeImageFilterTest(int, char* [] )
{
// Declare the type of the pixels
typedef itk::CovariantVector<float, 3> VectorPixelType;
// Declare the types of the images
typedef itk::Image<VectorPixelType, 2> VectorImageType;
typedef itk::Image<float, 2> FloatImageType;
// Define the size start index of the image
VectorImageType::SizeType size;
size.Fill(3);
VectorImageType::IndexType start;
start.Fill(0);
VectorImageType::RegionType region(start,size);
// Construct an image
VectorImageType::Pointer image = VectorImageType::New();
image->SetRegions( region );
image->Allocate();
// Create a default pixel
VectorPixelType pixel;
pixel[0] = 4;
pixel[1] = 2;
pixel[2] = 4;
image->FillBuffer(pixel);
// Declare Iterator type for the input image
typedef itk::ImageRegionIterator<VectorImageType> VectorIteratorType;
// Create an iterator for the image
VectorIteratorType imageIterator( image, image->GetRequestedRegion() );
// Declare the vector magnitude image filter
typedef itk::GradientToMagnitudeImageFilter<
VectorImageType,
FloatImageType > myMagnitudeFilterType;
// Create the filter
myMagnitudeFilterType::Pointer magnitude = myMagnitudeFilterType::New();
magnitude->SetInput( image );
// Now compute the magnitude of the gradient
try
{
magnitude->SetFunctor(magnitude->GetFunctor());
magnitude->Update();
}
catch(...)
{
std::cerr << "Exception thrown during Update() " << std::endl;
return EXIT_FAILURE;
}
// Get the Smart Pointer to the Filter Output
// It is important to do it AFTER the gradient filter is Updated
// Because the object connected to the output may be changed
// by another during GenerateData() call
FloatImageType::Pointer outputImage = magnitude->GetOutput();
// Declare Iterator type for the output image
typedef itk::ImageRegionIterator<
FloatImageType> myOutputIteratorType;
// Create an iterator for going through the output image
myOutputIteratorType outputIterator( outputImage,
outputImage->GetBufferedRegion() );
// Compare the result image to the known result
outputIterator.GoToBegin();
imageIterator.GoToBegin();
while( !outputIterator.IsAtEnd() )
{
// Check if the magnitude of each pixel is 6.0 (to a small tolerance)
if(itk::Math::abs(outputIterator.Get() - 6.0) > 1e-5)
{
std::cerr << "Every pixel magnitude should be 6! This one is "
<< imageIterator.Get() << " and has magnitude "
<< outputIterator.Get() << std::endl;
return EXIT_FAILURE;
}
++outputIterator;
++imageIterator;
}
std::cout << std::endl << "Test PASSED !! " << std::endl;
return EXIT_SUCCESS;
}
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