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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 "itkBSplineSecondOrderDerivativeKernelFunction.h"
#include "itkBSplineSecondOrderDerivativeKernelFunction2.h"
#include <ctime>
#include <iomanip>
//-------------------------------------------------------------------------------------
int
main( int argc, char * argv[] )
{
/** Some basic type definitions.
* NOTE: don't change the dimension or the spline order, since the
* hard-coded ground truth depends on this.
*/
const unsigned int SplineOrder = 3;
//const double distance = 1e-3; // the allowable distance
//const double allowedTimeDifference = 0.1; // 10% is considered within limits
/** The number of calls to Evaluate(). This number gives reasonably
* fast test results in Release mode.
*/
unsigned int N = static_cast< unsigned int >( 1e8 );
/** Other typedefs. */
typedef itk::BSplineSecondOrderDerivativeKernelFunction< SplineOrder > BSplineSODerivativeKernelType;
typedef itk::BSplineSecondOrderDerivativeKernelFunction2< SplineOrder > BSplineSODerivativeKernelType2;
/** Create the kernel. */
BSplineSODerivativeKernelType::Pointer dkernel = BSplineSODerivativeKernelType::New();
const unsigned int size_u = 15;
std::vector< double > u( size_u );
u[ 0 ] = -2.5;
u[ 1 ] = -2.0;
u[ 2 ] = -1.9;
u[ 3 ] = -1.5;
u[ 4 ] = -1.0;
u[ 5 ] = -0.8;
u[ 6 ] = -0.5;
u[ 7 ] = -0.1;
u[ 8 ] = 0.0;
for( unsigned int i = ( size_u + 3 ) / 2; i < size_u; ++i )
{
u[ i ] = -u[ size_u + 1 - i ];
}
/** Time the implementation. */
clock_t startClock = clock();
for( unsigned int i = 0; i < N; ++i )
{
dkernel->Evaluate( u[ 3 ] );
}
clock_t endClock = clock();
clock_t clockDiff = endClock - startClock;
std::cerr << "The elapsed time for ITK implementation is: "
<< clockDiff << std::endl;
/** Create the kernel. */
BSplineSODerivativeKernelType2::Pointer dkernel2 = BSplineSODerivativeKernelType2::New();
/** Time the implementation. */
startClock = clock();
for( unsigned int i = 0; i < N; ++i )
{
dkernel2->Evaluate( u[ 3 ] );
}
endClock = clock();
clockDiff = endClock - startClock;
std::cerr << "The elapsed time for our implementation is: "
<< clockDiff << std::endl;
/***************************************************************************/
for( unsigned int i = 0; i < size_u; ++i )
{
double diff = dkernel->Evaluate( u[ i ] ) - dkernel2->Evaluate( u[ i ] );
if( diff > 1e-5 )
{
std::cerr << "ERROR: our implementation differs from ITK." << std::endl;
return 1;
}
}
std::cerr << "The results are good." << std::endl;
//std::cerr << "\nITK output: " << dkernel->Evaluate( u ) << std::endl;
//std::cerr << "Our output: " << dkernel2->Evaluate( u ) << std::endl;
/** Return a value. */
return 0;
} // end main
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