/usr/include/ITK-4.9/itkAtanRegularizedHeavisideStepFunction.hxx is in libinsighttoolkit4-dev 4.9.0-4ubuntu1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | /*=========================================================================
*
* 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.
*
*=========================================================================*/
#ifndef itkAtanRegularizedHeavisideStepFunction_hxx
#define itkAtanRegularizedHeavisideStepFunction_hxx
#include "itkAtanRegularizedHeavisideStepFunction.h"
#include "vnl/vnl_math.h"
namespace itk
{
template< typename TInput, typename TOutput >
AtanRegularizedHeavisideStepFunction< TInput, TOutput >::
AtanRegularizedHeavisideStepFunction() : Superclass()
{}
template< typename TInput, typename TOutput >
AtanRegularizedHeavisideStepFunction< TInput, TOutput >::
~AtanRegularizedHeavisideStepFunction()
{}
template< typename TInput, typename TOutput >
typename AtanRegularizedHeavisideStepFunction< TInput, TOutput >::OutputType
AtanRegularizedHeavisideStepFunction< TInput, TOutput >
::Evaluate(const InputType & input) const
{
const RealType t = static_cast< RealType >( input ) * this->GetOneOverEpsilon();
return 0.5 + static_cast< OutputType >( vnl_math::one_over_pi * std::atan( t ) );
}
/** Evaluate the derivative at the specified input position */
template< typename TInput, typename TOutput >
typename AtanRegularizedHeavisideStepFunction< TInput, TOutput >::OutputType
AtanRegularizedHeavisideStepFunction< TInput, TOutput >
::EvaluateDerivative(const InputType & input) const
{
const RealType t = static_cast< RealType >( input ) * this->GetOneOverEpsilon();
return static_cast< OutputType >( vnl_math::one_over_pi / ( 1.0 + t * t ) );
}
} // namespace itk
#endif
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