lux.h

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/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (C) 2019, Raspberry Pi Ltd
 * Copyright (C) 2024, Paul Elder <paul.elder@ideasonboard.com>
 *
 * Helper class that implements lux estimation
 */
 
#pragma once
 
#include <libcamera/base/utils.h>
 
namespace libcamera {
 
class ValueNode;
 
namespace ipa {
 
class Histogram;
 
class Lux
{
public:
    Lux();
 
    int parseTuningData(const ValueNode &tuningData);
    double estimateLux(utils::Duration exposureTime,
               double aGain, double dGain,
               const Histogram &yHist) const;
 
private:
    utils::Duration referenceExposureTime_;
    double referenceAnalogueGain_;
    double referenceDigitalGain_;
    double referenceY_;
    double referenceLux_;
};
 
} /* namespace ipa */
 
} /* namespace libcamera */