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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 "itkVectorCentralDifferenceImageFunction.h"
#include "itkImageRegionIterator.h"
int itkVectorCentralDifferenceImageFunctionTest(int, char* [] )
{
const unsigned int ImageDimension = 2;
const unsigned int VectorDimension = 3;
typedef itk::Vector<short,VectorDimension> PixelType;
typedef itk::Image<PixelType,ImageDimension> ImageType;
ImageType::Pointer image = ImageType::New();
ImageType::SizeType size;
size.Fill( 16 );
ImageType::RegionType region( size );
image->SetRegions( region );
image->Allocate();
// make a test image
typedef itk::ImageRegionIterator<ImageType> Iterator;
Iterator iter( image, region );
iter.GoToBegin();
unsigned int counter = 0;
while ( !iter.IsAtEnd() )
{
iter.Set( counter++ );
++iter;
}
// set up central difference calculator
typedef float CoordRepType;
typedef itk::VectorCentralDifferenceImageFunction<ImageType,CoordRepType> FunctionType;
FunctionType::Pointer function = FunctionType::New();
function->SetInputImage( image );
ImageType::IndexType index;
// pick an index inside the image
index.Fill( 8 );
std::cout << "Index: " << index << " Derivative:" << std::endl;
std::cout << function->EvaluateAtIndex( index ) << std::endl;
if ( function->IsInsideBuffer( index ) )
{
std::cout << "Index: " << index << " is inside the BufferedRegion." << std::endl;
}
FunctionType::ContinuousIndexType cindex;
cindex.Fill( 8.0 );
std::cout << "ContinuousIndex: " << cindex << " Derivative:" << std::endl;
std::cout << function->EvaluateAtContinuousIndex( cindex ) << std::endl;
FunctionType::PointType point;
point.Fill( 8.0 );
std::cout << "Point: " << cindex << " Derivative:" << std::endl;
std::cout << function->Evaluate( point ) << std::endl;
// pick an index on the image edge
index.Fill( 8 );
index[0] = 15;
std::cout << "Index: " << index << " Derivative:" << std::endl;
std::cout << function->EvaluateAtIndex( index ) << std::endl;
if ( function->IsInsideBuffer( index ) )
{
std::cout << "Index: " << index << " is inside the BufferedRegion." << std::endl;
}
cindex.Fill( 8.0 );
cindex[0] = 15.0;
std::cout << "ContinuousIndex: " << cindex << " Derivative:" << std::endl;
std::cout << function->EvaluateAtContinuousIndex( cindex ) << std::endl;
point.Fill( 8.0 );
point[0] = 15.0;
std::cout << "Point: " << cindex << " Derivative:" << std::endl;
std::cout << function->Evaluate( point ) << std::endl;
std::cout << "Test passed." << std::endl;
return EXIT_SUCCESS;
}
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