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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2019, Raspberry Pi (Trading) Limited
*
* alsc.hpp - ALSC (auto lens shading correction) control algorithm
*/
#pragma once
#include <mutex>
#include <condition_variable>
#include <thread>
#include "../algorithm.hpp"
#include "../alsc_status.h"
namespace RPiController {
// Algorithm to generate automagic LSC (Lens Shading Correction) tables.
struct AlscCalibration {
double ct;
double table[ALSC_CELLS_X * ALSC_CELLS_Y];
};
struct AlscConfig {
// Only repeat the ALSC calculation every "this many" frames
uint16_t framePeriod;
// number of initial frames for which speed taken as 1.0 (maximum)
uint16_t startupFrames;
// IIR filter speed applied to algorithm results
double speed;
double sigmaCr;
double sigmaCb;
double minCount;
uint16_t minG;
double omega;
uint32_t nIter;
double luminanceLut[ALSC_CELLS_X * ALSC_CELLS_Y];
double luminanceStrength;
std::vector<AlscCalibration> calibrationsCr;
std::vector<AlscCalibration> calibrationsCb;
double defaultCt; // colour temperature if no metadata found
double threshold; // iteration termination threshold
double lambdaBound; // upper/lower bound for lambda from a value of 1
};
class Alsc : public Algorithm
{
public:
Alsc(Controller *controller = NULL);
~Alsc();
char const *name() const override;
void initialise() override;
void switchMode(CameraMode const &cameraMode, Metadata *metadata) override;
void read(boost::property_tree::ptree const ¶ms) override;
void prepare(Metadata *imageMetadata) override;
void process(StatisticsPtr &stats, Metadata *imageMetadata) override;
private:
// configuration is read-only, and available to both threads
AlscConfig config_;
bool firstTime_;
CameraMode cameraMode_;
double luminanceTable_[ALSC_CELLS_X * ALSC_CELLS_Y];
std::thread asyncThread_;
void asyncFunc(); // asynchronous thread function
std::mutex mutex_;
// condvar for async thread to wait on
std::condition_variable asyncSignal_;
// condvar for synchronous thread to wait on
std::condition_variable syncSignal_;
// for sync thread to check if async thread finished (requires mutex)
bool asyncFinished_;
// for async thread to check if it's been told to run (requires mutex)
bool asyncStart_;
// for async thread to check if it's been told to quit (requires mutex)
bool asyncAbort_;
// The following are only for the synchronous thread to use:
// for sync thread to note its has asked async thread to run
bool asyncStarted_;
// counts up to framePeriod before restarting the async thread
int framePhase_;
// counts up to startupFrames
int frameCount_;
// counts up to startupFrames for Process function
int frameCount2_;
double syncResults_[3][ALSC_CELLS_Y][ALSC_CELLS_X];
double prevSyncResults_[3][ALSC_CELLS_Y][ALSC_CELLS_X];
void waitForAysncThread();
// The following are for the asynchronous thread to use, though the main
// thread can set/reset them if the async thread is known to be idle:
void restartAsync(StatisticsPtr &stats, Metadata *imageMetadata);
// copy out the results from the async thread so that it can be restarted
void fetchAsyncResults();
double ct_;
bcm2835_isp_stats_region statistics_[ALSC_CELLS_Y * ALSC_CELLS_X];
double asyncResults_[3][ALSC_CELLS_Y][ALSC_CELLS_X];
double asyncLambdaR_[ALSC_CELLS_X * ALSC_CELLS_Y];
double asyncLambdaB_[ALSC_CELLS_X * ALSC_CELLS_Y];
void doAlsc();
double lambdaR_[ALSC_CELLS_X * ALSC_CELLS_Y];
double lambdaB_[ALSC_CELLS_X * ALSC_CELLS_Y];
};
} // namespace RPiController
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