kopia lustrzana https://github.com/vsamy/DiFipp
96 wiersze
3.4 KiB
C++
96 wiersze
3.4 KiB
C++
// Copyright (c) 2019, Vincent SAMY
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// All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// The views and conclusions contained in the software and documentation are those
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// of the authors and should not be interpreted as representing official policies,
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// either expressed or implied, of the FreeBSD Project.
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#include <limits>
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namespace difi {
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// Public functions
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template <typename T>
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void BaseFilter<T>::setType(Type type)
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{
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Expects(type == Type::Centered ? m_bCoeff.size() > 2 && m_bCoeff.size() % 2 == 1 : true);
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m_center = (type == Type::Forward ? 0 : (m_bCoeff.size() - 1) / 2);
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}
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template <typename T>
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template <typename T2>
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void BaseFilter<T>::setCoeffs(T2&& aCoeff, T2&& bCoeff)
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{
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static_assert(std::is_convertible_v<T2, vectX_t<T>>, "The coefficients types should be convertible to vectX_t<T>");
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Expects(checkCoeffs(aCoeff, bCoeff, (m_center == 0 ? Type::Forward : Type::Centered)));
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m_aCoeff = aCoeff;
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m_bCoeff = bCoeff;
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normalizeCoeffs();
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resetFilter();
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m_isInitialized = true;
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}
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template <typename T>
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void BaseFilter<T>::getCoeffs(vectX_t<T>& aCoeff, vectX_t<T>& bCoeff) const noexcept
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{
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aCoeff = m_aCoeff;
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bCoeff = m_bCoeff;
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}
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// Protected functions
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template <typename T>
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BaseFilter<T>::BaseFilter(const vectX_t<T>& aCoeff, const vectX_t<T>& bCoeff, FilterType type)
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: m_aCoeff(aCoeff)
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, m_bCoeff(bCoeff)
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, m_filteredData(aCoeff.size())
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, m_rawData(bCoeff.size())
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{
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Expects(checkCoeffs(aCoeff, bCoeff, type));
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m_center = (type == Type::Forward ? 0 : (bCoeff.size() - 1) / 2);
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normalizeCoeffs();
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resetFilter();
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m_isInitialized = true;
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}
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template <typename T>
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void BaseFilter<T>::normalizeCoeffs()
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{
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T a0 = m_aCoeff(0);
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if (std::abs(a0 - T(1)) < std::numeric_limits<T>::epsilon())
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return;
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m_aCoeff /= a0;
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m_bCoeff /= a0;
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}
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template <typename T>
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bool BaseFilter<T>::checkCoeffs(const vectX_t<T>& aCoeff, const vectX_t<T>& bCoeff, FilterType type)
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{
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bool centering = (type == Type::Centered ? (bCoeff.size() % 2 == 1) : true);
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return aCoeff.size() > 0 && std::abs(aCoeff[0]) > std::numeric_limits<T>::epsilon() && bCoeff.size() > 0 && centering;
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}
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} // namespace difi
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