Jean-Michel Hautbois
4fdf1e4f5e
Now that we have the real exposure applied at each frame, remove the early return based on a frame counter and compute the gain for each frame. Introduce a number of startup frames during which the filter speed is 1.0, meaning we apply instantly the exposure value calculated and not a slower filtered one. This is used to have a faster convergence, and those frames may be dropped in a future development to hide the convergance process from the viewer. Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Umang Jain <umang.jain@ideasonboard.com> Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/*
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* Copyright (C) 2021, Ideas On Board
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*
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* agc.h - IPU3 AGC/AEC mean-based control algorithm
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*/
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#ifndef __LIBCAMERA_IPU3_ALGORITHMS_AGC_H__
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#define __LIBCAMERA_IPU3_ALGORITHMS_AGC_H__
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#include <linux/intel-ipu3.h>
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#include <libcamera/base/utils.h>
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#include <libcamera/geometry.h>
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#include "algorithm.h"
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namespace libcamera {
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struct IPACameraSensorInfo;
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namespace ipa::ipu3::algorithms {
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class Agc : public Algorithm
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{
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public:
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Agc();
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~Agc() = default;
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int configure(IPAContext &context, const IPAConfigInfo &configInfo) override;
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void process(IPAContext &context, const ipu3_uapi_stats_3a *stats) override;
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private:
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void measureBrightness(const ipu3_uapi_stats_3a *stats,
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const ipu3_uapi_grid_config &grid);
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void filterExposure();
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void computeExposure(IPAFrameContext &frameContext);
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uint64_t frameCount_;
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double iqMean_;
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utils::Duration lineDuration_;
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uint32_t minExposureLines_;
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uint32_t maxExposureLines_;
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double minAnalogueGain_;
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double maxAnalogueGain_;
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utils::Duration filteredExposure_;
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utils::Duration currentExposure_;
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utils::Duration prevExposureValue_;
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uint32_t stride_;
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};
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} /* namespace ipa::ipu3::algorithms */
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} /* namespace libcamera */
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#endif /* __LIBCAMERA_IPU3_ALGORITHMS_AGC_H__ */
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