DiFipp/include/BaseFilter.tpp

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3.3 KiB
C++

// Copyright (c) 2019, Vincent SAMY
// All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// The views and conclusions contained in the software and documentation are those
// of the authors and should not be interpreted as representing official policies,
// either expressed or implied, of the FreeBSD Project.
#include <limits>
namespace difi {
// Public functions
template <typename T, typename Derived>
void BaseFilter<T, Derived>::setType(FilterType type)
{
Expects(type == FilterType::Centered ? m_bCoeff.size() > 2 && m_bCoeff.size() % 2 == 1 : true);
m_type = type;
}
template <typename T, typename Derived>
void BaseFilter<T, Derived>::setCoeffs(const vectX_t<T>& aCoeff, const vectX_t<T>& bCoeff)
{
Expects(checkCoeffs(aCoeff, bCoeff));
m_aCoeff = aCoeff;
m_bCoeff = bCoeff;
normalizeCoeffs();
resetFilter();
m_isInitialized = true;
}
template <typename T, typename Derived>
void BaseFilter<T, Derived>::getCoeffs(vectX_t<T>& aCoeff, vectX_t<T>& bCoeff) const noexcept
{
aCoeff = m_aCoeff;
bCoeff = m_bCoeff;
}
// Protected functions
template <typename T, typename Derived>
BaseFilter<T, Derived>::BaseFilter(const vectX_t<T>& aCoeff, const vectX_t<T>& bCoeff, FilterType type)
: m_aCoeff(aCoeff)
, m_bCoeff(bCoeff)
, m_type(type)
, m_filteredData(aCoeff.size())
, m_rawData(bCoeff.size())
{
Expects(checkCoeffs(aCoeff, bCoeff));
normalizeCoeffs();
resetFilter();
m_isInitialized = true;
}
template <typename T, typename Derived>
void BaseFilter<T, Derived>::normalizeCoeffs()
{
T a0 = m_aCoeff(0);
if (std::abs(a0 - T(1)) < std::numeric_limits<T>::epsilon())
return;
m_aCoeff /= a0;
m_bCoeff /= a0;
}
template <typename T, typename Derived>
bool BaseFilter<T, Derived>::checkCoeffs(const vectX_t<T>& aCoeff, const vectX_t<T>& bCoeff)
{
bool centering = (m_type == FilterType::Centered ? (bCoeff.size() % 2 == 1) : true);
return aCoeff.size() > 0 && std::abs(aCoeff[0]) > std::numeric_limits<T>::epsilon() && bCoeff.size() > 0 && centering;
}
} // namespace difi