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itkButterworthBandpass1DFilterFunction.h
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itkButterworthBandpass1DFilterFunction.h
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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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 itkButterworthBandpass1DFilterFunction_h
#define itkButterworthBandpass1DFilterFunction_h
#include "itkFrequencyDomain1DFilterFunction.h"
#include "itkMath.h"
namespace itk
{
class ButterworthBandpass1DFilterFunction : public FrequencyDomain1DFilterFunction
{
public:
/** Standard class type alias. */
using Self = ButterworthBandpass1DFilterFunction;
using Superclass = FrequencyDomain1DFilterFunction;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
itkTypeMacro(ButterworthBandpass1DFilterFunction, FrequencyDomain1DFilterFunction);
itkNewMacro(Self);
double
EvaluateFrequency(double f) const override
{
// highpass
double x = 1.0;
if (m_LowerFrequency > 0.0)
{
x = 1.0 - 1.0 / (1.0 + std::pow(f / m_LowerFrequency, 2 * m_Order));
}
// lowpass
double y = 1.0;
if (m_UpperFrequency > 0.0)
{
y = 1.0 / (1.0 + std::pow(f / m_UpperFrequency, 2 * m_Order));
}
return x * y;
};
itkSetMacro(UpperFrequency, double);
itkGetMacro(UpperFrequency, double);
itkSetMacro(LowerFrequency, double);
itkGetMacro(LowerFrequency, double);
itkSetMacro(Order, int);
itkGetMacro(Order, int);
protected:
ButterworthBandpass1DFilterFunction()
{
m_Order = 1;
m_LowerFrequency = 0.0;
m_UpperFrequency = 1.0;
}
virtual void
PrintSelf(std::ostream & os, Indent indent) const override
{
Superclass::PrintSelf(os, indent);
os << indent << "LowerFrequency: " << m_LowerFrequency << std::endl;
os << indent << "UpperFrequency: " << m_UpperFrequency << std::endl;
os << indent << "Order: " << m_Order << std::endl;
}
private:
int m_Order;
double m_LowerFrequency;
double m_UpperFrequency;
};
} // namespace itk
#endif // ButterworthBandpass1DFilterFunction.h