Stefan Klug
57a46118a8
Calculate the error introduced by quantization as "quantization gain" and return it separately from splitExposure(). It is not included in the digital gain, to not silently ignore the limits imposed by the AGC configuration. Signed-off-by: Stefan Klug <stefan.klug@ideasonboard.com> Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2024, Paul Elder <paul.elder@ideasonboard.com>
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*
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* Helper class that performs computations relating to exposure
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*/
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#pragma once
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#include <tuple>
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#include <utility>
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#include <vector>
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#include <libcamera/base/span.h>
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#include <libcamera/base/utils.h>
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#include "camera_sensor_helper.h"
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namespace libcamera {
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namespace ipa {
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class ExposureModeHelper
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{
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public:
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ExposureModeHelper(const Span<std::pair<utils::Duration, double>> stages);
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~ExposureModeHelper() = default;
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void configure(utils::Duration lineLength, const CameraSensorHelper *sensorHelper);
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void setLimits(utils::Duration minExposureTime, utils::Duration maxExposureTime,
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double minGain, double maxGain);
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std::tuple<utils::Duration, double, double, double>
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splitExposure(utils::Duration exposure) const;
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utils::Duration minExposureTime() const { return minExposureTime_; }
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utils::Duration maxExposureTime() const { return maxExposureTime_; }
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double minGain() const { return minGain_; }
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double maxGain() const { return maxGain_; }
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private:
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utils::Duration clampExposureTime(utils::Duration exposureTime,
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double *quantizationGain = nullptr) const;
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double clampGain(double gain, double *quantizationGain = nullptr) const;
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std::vector<utils::Duration> exposureTimes_;
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std::vector<double> gains_;
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utils::Duration lineDuration_;
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utils::Duration minExposureTime_;
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utils::Duration maxExposureTime_;
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double minGain_;
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double maxGain_;
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const CameraSensorHelper *sensorHelper_;
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};
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} /* namespace ipa */
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} /* namespace libcamera */
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