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81 lines
2.0 KiB
C++
81 lines
2.0 KiB
C++
/*
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* Copyright (c) Contributors to the Open 3D Engine Project.
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* For complete copyright and license terms please see the LICENSE at the root of this distribution.
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*
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* SPDX-License-Identifier: Apache-2.0 OR MIT
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*
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*/
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#pragma once
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namespace ImageProcessingAtom
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{
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template <size_t BIN_COUNT>
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class Histogram
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{
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public:
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typedef AZ::u64 Bins[BIN_COUNT];
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public:
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Histogram()
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{
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}
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static void clearBins(Bins& bins)
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{
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memset(&bins, 0, sizeof(bins));
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}
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void set(const Bins& bins)
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{
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m_bins[0] = bins[0];
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m_binsCumulative[0] = bins[0];
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double sum = 0.0f;
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for (size_t i = 1; i < BIN_COUNT; ++i)
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{
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m_bins[i] = bins[i];
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m_binsCumulative[i] = m_binsCumulative[i - 1] + bins[i];
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sum += i * double(bins[i]);
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}
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const AZ::u64 totalCount = getTotalSampleCount();
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m_meanBin = (totalCount <= 0) ? 0.0f : float(sum / totalCount);
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}
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AZ::u64 getTotalSampleCount() const
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{
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return m_binsCumulative[BIN_COUNT - 1];
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}
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float getPercentage(size_t minBin, size_t maxBin) const
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{
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const AZ::u64 totalCount = getTotalSampleCount();
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if ((totalCount <= 0) || (minBin > maxBin) || (maxBin < 0) || (minBin >= BIN_COUNT))
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{
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return 0.0f;
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}
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minBin = AZ::GetMax(minBin, size_t(0));
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maxBin = AZ::GetMin(maxBin, BIN_COUNT - 1);
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const AZ::u64 count = m_binsCumulative[maxBin] - ((minBin <= 0) ? 0 : m_binsCumulative[minBin - 1]);
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return float((double(count) * 100.0) / double(totalCount));
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}
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float getMeanBin() const
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{
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return m_meanBin;
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}
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private:
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Bins m_bins;
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Bins m_binsCumulative;
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float m_meanBin;
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};
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bool ComputeLuminanceHistogram(IImageObjectPtr imageObject, Histogram<256>& histogram);
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}
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