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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 "itkMinimumImageFilter.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkTestingMacros.h"
int itkMinimumImageFilterTest( int, char* [] )
{
// Define the dimension of the images
const unsigned int Dimension = 3;
typedef unsigned char PixelType;
// Declare the types of the images
typedef itk::Image< PixelType, Dimension > ImageType;
// Declare the type of the index to access images
typedef itk::Index< Dimension > IndexType;
// Declare the type of the size
typedef itk::Size< Dimension > SizeType;
// Declare the type of the Region
typedef itk::ImageRegion< Dimension > RegionType;
// Declare the type for the MULTIPLY filter
typedef itk::MinimumImageFilter< ImageType, ImageType,
ImageType > MinimumFilterType;
// Create two images
ImageType::Pointer inputImageA = ImageType::New();
ImageType::Pointer inputImageB = ImageType::New();
// Define their size, and start index
SizeType size;
size[0] = 2;
size[1] = 2;
size[2] = 2;
IndexType start;
start[0] = 0;
start[1] = 0;
start[2] = 0;
RegionType region;
region.SetIndex( start );
region.SetSize( size );
// Initialize Image A
inputImageA->SetLargestPossibleRegion( region );
inputImageA->SetBufferedRegion( region );
inputImageA->SetRequestedRegion( region );
inputImageA->Allocate();
// Initialize Image B
inputImageB->SetLargestPossibleRegion( region );
inputImageB->SetBufferedRegion( region );
inputImageB->SetRequestedRegion( region );
inputImageB->Allocate();
// Define the pixel values for each image
PixelType largePixelValue = 3;
PixelType smallPixelValue = 2;
// Declare Iterator types apropriated for each image
typedef itk::ImageRegionIteratorWithIndex< ImageType > IteratorType;
// Create one iterator for Image A (this is a light object)
IteratorType it1( inputImageA, inputImageA->GetBufferedRegion() );
// Initialize the content of Image A
while( !it1.IsAtEnd() )
{
it1.Set( smallPixelValue );
++it1;
}
// Create one iterator for Image B (this is a light object)
IteratorType it2( inputImageB, inputImageB->GetBufferedRegion() );
// Initialize the content of Image B
while( !it2.IsAtEnd() )
{
it2.Set( largePixelValue );
++it2;
}
// Create the filter
MinimumFilterType::Pointer minimumImageFilter = MinimumFilterType::New();
EXERCISE_BASIC_OBJECT_METHODS( minimumImageFilter, MinimumImageFilter,
BinaryFunctorImageFilter);
// Connect the input images
minimumImageFilter->SetInput1( inputImageA );
minimumImageFilter->SetInput2( inputImageB );
// Get the Smart Pointer to the filter output
ImageType::Pointer outputImage = minimumImageFilter->GetOutput();
minimumImageFilter->SetFunctor( minimumImageFilter->GetFunctor() );
// Execute the filter
minimumImageFilter->Update();
// Test some pixels in the result image
// Note that we are not comparing the entirety of the filter output in order
// to keep compile time as small as possible
ImageType::IndexType pixelIndex = {{0, 1, 1}};
TEST_EXPECT_EQUAL( outputImage->GetPixel( start ), smallPixelValue );
TEST_EXPECT_EQUAL( outputImage->GetPixel( pixelIndex ), smallPixelValue );
// All objects should be automatically destroyed at this point
return EXIT_SUCCESS;
}
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