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/*=========================================================================
*
* Copyright UMC Utrecht and contributors
*
* 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 "itkBSplineDerivativeKernelFunction.h"
#include "itkBSplineDerivativeKernelFunction2.h"
#include "itkKernelFunctionBase.h"
#include <ctime>
#include <iomanip>
//-------------------------------------------------------------------------------------
int
main( int argc, char * argv[] )
{
/** Some basic type definitions. */
std::vector< unsigned int > splineOrders;
splineOrders.push_back( 1 );
splineOrders.push_back( 2 );
splineOrders.push_back( 3 );
/** The number of calls to Evaluate(). This number gives reasonably
* fast test results in Release mode.
* Increase it for real time testing.
*/
unsigned int N = static_cast< unsigned int >( 1e7 );
const double maxAllowedDistance = 1e-5; // the allowable distance
/** Other typedefs. */
typedef itk::KernelFunctionBase< double > BaseKernelType;
typedef itk::BSplineDerivativeKernelFunction< 1 > KernelType_ITK_1;
typedef itk::BSplineDerivativeKernelFunction2< 1 > KernelType_elx_1;
typedef itk::BSplineDerivativeKernelFunction< 2 > KernelType_ITK_2;
typedef itk::BSplineDerivativeKernelFunction2< 2 > KernelType_elx_2;
typedef itk::BSplineDerivativeKernelFunction< 3 > KernelType_ITK_3;
typedef itk::BSplineDerivativeKernelFunction2< 3 > KernelType_elx_3;
/** Create the evaluation points. */
//const unsigned int size_u = 17;
std::vector< double > u;
u.push_back( -2.5 );
u.push_back( -2.0 );
u.push_back( -1.9 );
u.push_back( -1.5 );
u.push_back( -1.0 );
u.push_back( -0.8 );
u.push_back( -0.5 );
u.push_back( -0.1 );
u.push_back( 0.0 );
for( int i = static_cast< int >( u.size() ) - 2; i > -1; --i )
{
u.push_back( -u[ i ] );
}
/** For all spline orders. */
for( unsigned int so = 0; so < splineOrders.size(); so++ )
{
std::cerr << "Evaluating spline order " << splineOrders[ so ] << std::endl;
/** Create the kernel. */
BaseKernelType::Pointer kernel_ITK, kernel_elx;
if( splineOrders[ so ] == 1 )
{
kernel_ITK = KernelType_ITK_1::New();
kernel_elx = KernelType_elx_1::New();
}
else if( splineOrders[ so ] == 2 )
{
kernel_ITK = KernelType_ITK_2::New();
kernel_elx = KernelType_elx_2::New();
}
else if( splineOrders[ so ] == 3 )
{
kernel_ITK = KernelType_ITK_3::New();
kernel_elx = KernelType_elx_3::New();
}
else
{
std::cerr << "ERROR: spline order " << splineOrders[ so ]
<< " not defined." << std::endl;
return 1;
}
/** Print header. */
std::cerr << "eval at:";
for( unsigned int j = 0; j < u.size(); j++ )
{
std::cerr << " " << u[ j ];
}
std::cerr << " average" << std::endl;
/** Time the ITK implementation. */
std::cerr << "ITK new:";
clock_t startClock = clock();
for( unsigned int j = 0; j < u.size(); j++ )
{
clock_t startClockRegion = clock();
for( unsigned int i = 0; i < N; ++i )
{
kernel_ITK->Evaluate( u[ j ] );
}
std::cerr << " " << ( clock() - startClockRegion ) * 1000.0 / CLOCKS_PER_SEC;
}
clock_t endClock = clock();
clock_t clockDiff = endClock - startClock;
std::cerr << " " << clockDiff * 1000.0 / CLOCKS_PER_SEC << " ms" << std::endl;
/** Time the elx implementation. */
std::cerr << "elastix:";
startClock = clock();
for( unsigned int j = 0; j < u.size(); j++ )
{
clock_t startClockRegion = clock();
for( unsigned int i = 0; i < N; ++i )
{
kernel_elx->Evaluate( u[ j ] );
}
std::cerr << " " << ( clock() - startClockRegion ) * 1000.0 / CLOCKS_PER_SEC;
}
endClock = clock();
clockDiff = endClock - startClock;
std::cerr << " " << clockDiff * 1000.0 / CLOCKS_PER_SEC << " ms" << std::endl;
/** Compare the results. */
for( unsigned int i = 0; i < u.size(); ++i )
{
double diff = kernel_ITK->Evaluate( u[ i ] ) - kernel_elx->Evaluate( u[ i ] );
if( diff > maxAllowedDistance )
{
std::cerr << "ERROR: our implementation differs from ITK." << std::endl;
return 1;
}
}
std::cerr << "The results are good.\n" << std::endl;
} // end for all spline orders
/** Return a value. */
return 0;
} // end main
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