src/ipa/raspberrypi/controller/rpi/sdn.cpp


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/* SPDX-License-Identifier: BSD-2-Clause */
/*
 * Copyright (C) 2019-2021, Raspberry Pi (Trading) Limited
 *
 * sdn.cpp - SDN (spatial denoise) control algorithm
 */

#include "libcamera/internal/log.h"

#include "../denoise_status.h"
#include "../noise_status.h"

#include "sdn.hpp"

using namespace RPiController;
using namespace libcamera;

LOG_DEFINE_CATEGORY(RPiSdn)

// Calculate settings for the spatial denoise block using the noise profile in
// the image metadata.

#define NAME "rpi.sdn"

Sdn::Sdn(Controller *controller)
	: DenoiseAlgorithm(controller), mode_(DenoiseMode::ColourOff)
{
}

char const *Sdn::Name() const
{
	return NAME;
}

void Sdn::Read(boost::property_tree::ptree const &params)
{
	deviation_ = params.get<double>("deviation", 3.2);
	strength_ = params.get<double>("strength", 0.75);
}

void Sdn::Initialise() {}

void Sdn::Prepare(Metadata *image_metadata)
{
	struct NoiseStatus noise_status = {};
	noise_status.noise_slope = 3.0; // in case no metadata
	if (image_metadata->Get("noise.status", noise_status) != 0)
		LOG(RPiSdn, Warning) << "no noise profile found";
	LOG(RPiSdn, Debug)
		<< "Noise profile: constant " << noise_status.noise_constant
		<< " slope " << noise_status.noise_slope;
	struct DenoiseStatus status;
	status.noise_constant = noise_status.noise_constant * deviation_;
	status.noise_slope = noise_status.noise_slope * deviation_;
	status.strength = strength_;
	status.mode = static_cast<std::underlying_type_t<DenoiseMode>>(mode_);
	image_metadata->Set("denoise.status", status);
	LOG(RPiSdn, Debug)
		<< "programmed constant " << status.noise_constant
		<< " slope " << status.noise_slope
		<< " strength " << status.strength;
}

void Sdn::SetMode(DenoiseMode mode)
{
	// We only distinguish between off and all other modes.
	mode_ = mode;
}

// Register algorithm with the system.
static Algorithm *Create(Controller *controller)
{
	return (Algorithm *)new Sdn(controller);
}
static RegisterAlgorithm reg(NAME, &Create);