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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 <stdio.h>
#include "itkVarianceImageFunction.h"
#include "itkImage.h"
int itkVarianceImageFunctionTest(int, char* [] )
{
const unsigned int Dimension = 3;
typedef unsigned char PixelType;
typedef itk::Image< PixelType, Dimension > ImageType;
typedef itk::VarianceImageFunction< ImageType > FunctionType;
// Create and allocate the image
ImageType::Pointer image = ImageType::New();
ImageType::SizeType size;
ImageType::IndexType start;
ImageType::RegionType region;
size[0] = 50;
size[1] = 50;
size[2] = 50;
start.Fill( 0 );
region.SetIndex( start );
region.SetSize( size );
image->SetRegions( region );
image->Allocate();
image->FillBuffer( 27 );
FunctionType::Pointer function = FunctionType::New();
function->SetInputImage( image );
function->SetNeighborhoodRadius( 5 );
ImageType::IndexType index;
index[0] = 25;
index[1] = 25;
index[2] = 25;
FunctionType::OutputType variance;
variance = function->EvaluateAtIndex( index );
// Test Evaluate
FunctionType::PointType point;
point[0] = 25;
point[1] = 25;
point[2] = 25;
FunctionType::OutputType variance2;
variance2 = function->Evaluate(point);
std::cout << "function->Evaluate(point): "
<< static_cast<itk::NumericTraits<FunctionType::OutputType>::PrintType>(variance2)
<< std::endl;
// Test EvaluateAtContinuousIndex
FunctionType::ContinuousIndexType cindex;
cindex[0] = 25;
cindex[1] = 25;
cindex[2] = 25;
FunctionType::OutputType variance3;
variance3 = function->EvaluateAtContinuousIndex(cindex);
std::cout << "function->EvaluateAtContinuousIndex(cindex): "
<< static_cast<itk::NumericTraits<FunctionType::OutputType>::PrintType>(variance3)
<< std::endl;
// Test GetConstReferenceMacro
const unsigned int & neighborhoodRadius = function->GetNeighborhoodRadius();
std::cout << "function->GetNeighborhoodRadius(): " << neighborhoodRadius << std::endl;
// since the input image is constant
// the variance should be zero
if( itk::Math::abs( variance ) > 10e-7 )
{
std::cerr << "Error in variance computation" << std::endl;
return EXIT_FAILURE;
}
std::cout << "Test PASSED ! " << std::endl;
return EXIT_SUCCESS;
}
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