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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 "itkMath.h"
#include "itkNearestNeighborExtrapolateImageFunction.h"
#include "itkImageRegionIterator.h"
/**
* This module tests the functionality of the
* NearestNeighborExtrapolateImageFunction class.
*
*/
int itkNearestNeighborExtrapolateImageFunctionTest( int, char *[])
{
typedef double CoordRep;
const unsigned int ImageDimension = 2;
typedef unsigned char PixelType;
const unsigned int VectorDimension = 4;
typedef itk::Vector< PixelType, VectorDimension > VectorPixelType;
typedef itk::Image<PixelType,ImageDimension> ImageType;
typedef itk::Image< VectorPixelType, ImageDimension > VectorImageType;
ImageType::SizeType imageSize;
imageSize[0] = 5;
imageSize[1] = 7;
ImageType::RegionType imageRegion( imageSize );
ImageType::Pointer image = ImageType::New();
image->SetRegions( imageRegion );
image->Allocate();
VectorImageType::Pointer vectorimage = VectorImageType::New();
vectorimage->SetRegions( imageRegion );
vectorimage->Allocate();
typedef itk::ImageRegionIterator<ImageType> Iterator;
Iterator iter( image, imageRegion );
iter.GoToBegin();
unsigned char counter = 0;
while( !iter.IsAtEnd() )
{
iter.Set( counter++ );
++iter;
}
typedef itk::ImageRegionIterator<VectorImageType> VectorIterator;
VectorIterator vectoriter( vectorimage, imageRegion );
vectoriter.GoToBegin();
counter = 0;
while( !vectoriter.IsAtEnd() )
{
VectorPixelType & vectorpixel = vectoriter.Value();
vectorpixel.Fill( counter++ );
++vectoriter;
}
// set up the extrapolator
typedef itk::NearestNeighborExtrapolateImageFunction<ImageType,CoordRep> FunctionType;
FunctionType::Pointer function = FunctionType::New();
typedef itk::NearestNeighborExtrapolateImageFunction<VectorImageType,CoordRep> VectorFunctionType;
VectorFunctionType::Pointer vectorfunction = VectorFunctionType::New();
function->SetInputImage( image );
vectorfunction->SetInputImage( vectorimage );
FunctionType::IndexType index;
FunctionType::PointType point;
FunctionType::OutputType value;
FunctionType::OutputType trueValue;
VectorFunctionType::OutputType vectorvalue;
VectorFunctionType::OutputType trueVectorValue;
// evaluate at point inside the image
point[0] = 2.25;
point[1] = 3.25;
value = function->Evaluate( point );
vectorvalue = vectorfunction->Evaluate( point );
trueValue = itk::Math::Round<int>( point[0] ) +
( itk::Math::Round<int>( point[1] ) ) * static_cast<double>( imageSize[0] );
trueVectorValue.Fill( trueValue );
std::cout << "Point: " << point << " Value: " << value
<< " Vector Value: " << vectorvalue << std::endl;
if ( itk::Math::NotAlmostEquals(value, trueValue) )
{
std::cout << "Value not the same as trueValue: " << trueValue << std::endl;
std::cout << "Test failed. " << std::endl;
return EXIT_FAILURE;
}
if ( vectorvalue != trueVectorValue )
{
std::cout << "Vector Value not the same as trueVectorValue: " << trueVectorValue << std::endl;
std::cout << "Test failed. " << std::endl;
return EXIT_FAILURE;
}
// evaluate at point outside the image
point[0] = 2.25;
point[1] = 8.0;
value = function->Evaluate( point );
trueValue = itk::Math::Round<int>( point[0] ) +
( 6.0 ) * static_cast<double>( imageSize[0] );
std::cout << "Point: " << point << " Value: " << value << std::endl;
if ( itk::Math::NotAlmostEquals(value, trueValue) )
{
std::cout << "Value not the same as trueValue: " << trueValue << std::endl;
std::cout << "Test failed. " << std::endl;
return EXIT_FAILURE;
}
// evaluate at index inside the image
index[0] = 4;
index[1] = 5;
value = function->EvaluateAtIndex( index );
trueValue = static_cast<double>( index[0] ) +
static_cast<double>( index[1] ) * static_cast<double>( imageSize[0] );
std::cout << "Index: " << index << " Value: " << value << std::endl;
if ( itk::Math::NotAlmostEquals(value, trueValue) )
{
std::cout << "Value not the same as trueValue: " << trueValue << std::endl;
std::cout << "Test failed. " << std::endl;
return EXIT_FAILURE;
}
// evaluate at index outside the image
index[0] = 8;
index[1] = -1;
value = function->EvaluateAtIndex( index );
trueValue = static_cast<double>( 4 ) +
static_cast<double>( 0 ) * static_cast<double>( imageSize[0] );
std::cout << "Index: " << index << " Value: " << value << std::endl;
if ( itk::Math::NotAlmostEquals(value, trueValue) )
{
std::cout << "Value not the same as trueValue: " << trueValue << std::endl;
std::cout << "Test failed. " << std::endl;
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}
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