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awb.h
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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2024 Ideas on Board Oy
*
* Generic AWB algorithms
*/
#pragma once
#include <map>
#include <optional>
#include <libcamera/control_ids.h>
#include <libcamera/controls.h>
#include "libcamera/internal/vector.h"
#include "libcamera/internal/yaml_parser.h"
namespace libcamera {
namespace ipa {
struct AwbResult {
RGB<double> gains;
double colourTemperature;
};
struct AwbStats {
virtual double computeColourError(const RGB<double> &gains) const = 0;
virtual RGB<double> rgbMeans() const = 0;
protected:
~AwbStats() = default;
};
class AwbAlgorithm
{
public:
virtual ~AwbAlgorithm() = default;
virtual int init(const YamlObject &tuningData) = 0;
virtual AwbResult calculateAwb(const AwbStats &stats, unsigned int lux) = 0;
virtual std::optional<RGB<double>> gainsFromColourTemperature(double colourTemperature) = 0;
const ControlInfoMap::Map &controls() const
{
return controls_;
}
virtual void handleControls([[maybe_unused]] const ControlList &controls) {}
protected:
int parseModeConfigs(const YamlObject &tuningData,
const ControlValue &def = {});
struct ModeConfig {
double ctHi;
double ctLo;
};
ControlInfoMap::Map controls_;
std::map<controls::AwbModeEnum, AwbAlgorithm::ModeConfig> modes_;
};
} /* namespace ipa */
} /* namespace libcamera */
libcamera::ControlInfoMap::Map
std::unordered_map< const ControlId *, ControlInfo > Map
The base std::unsorted_map<> container.
Definition controls.h:367
libcamera::ControlList
Associate a list of ControlId with their values for an object.
Definition controls.h:409
libcamera::ControlValue
Abstract type representing the value of a control.
Definition controls.h:134
libcamera::YamlObject
A class representing the tree structure of the YAML content.
Definition yaml_parser.h:28
libcamera::ipa::AwbAlgorithm
A base class for auto white balance algorithms.
Definition awb.h:37
libcamera::ipa::AwbAlgorithm::controls
const ControlInfoMap::Map & controls() const
Get the controls info map for this algorithm.
Definition awb.h:45
libcamera::ipa::AwbAlgorithm::init
virtual int init(const YamlObject &tuningData)=0
Initialize the algorithm with the given tuning data.
libcamera::ipa::AwbAlgorithm::controls_
ControlInfoMap::Map controls_
Controls info map for the controls provided by the algorithm.
Definition awb.h:61
libcamera::ipa::AwbAlgorithm::parseModeConfigs
int parseModeConfigs(const YamlObject &tuningData, const ControlValue &def={})
Parse the mode configurations from the tuning data.
Definition awb.cpp:165
libcamera::ipa::AwbAlgorithm::gainsFromColourTemperature
virtual std::optional< RGB< double > > gainsFromColourTemperature(double colourTemperature)=0
Compute white balance gains from a colour temperature.
libcamera::ipa::AwbAlgorithm::handleControls
virtual void handleControls(const ControlList &controls)
Handle the controls supplied in a request.
Definition awb.h:50
libcamera::ipa::AwbAlgorithm::calculateAwb
virtual AwbResult calculateAwb(const AwbStats &stats, unsigned int lux)=0
Calculate AWB data from the given statistics.
libcamera::ipa::AwbAlgorithm::modes_
std::map< controls::AwbModeEnum, AwbAlgorithm::ModeConfig > modes_
Map of all configured modes.
Definition awb.h:62
control_ids.h
Camera controls identifiers.
controls.h
Framework to manage controls related to an object.
libcamera::ipa
The IPA (Image Processing Algorithm) namespace.
Definition af.cpp:58
libcamera
Top-level libcamera namespace.
Definition backtrace.h:17
libcamera::RGB
Vector< T, 3 > RGB
A Vector of 3 elements representing an RGB pixel value.
Definition vector.h:297
libcamera::ipa::AwbAlgorithm::ModeConfig
Holds the configuration of a single AWB mode.
Definition awb.h:56
libcamera::ipa::AwbAlgorithm::ModeConfig::ctLo
double ctLo
The lowest valid colour temperature of that mode.
Definition awb.h:58
libcamera::ipa::AwbAlgorithm::ModeConfig::ctHi
double ctHi
The highest valid colour temperature of that mode.
Definition awb.h:57
libcamera::ipa::AwbResult
The result of an AWB calculation.
Definition awb.h:23
libcamera::ipa::AwbResult::colourTemperature
double colourTemperature
The calculated colour temperature in Kelvin.
Definition awb.h:25
libcamera::ipa::AwbResult::gains
RGB< double > gains
The calculated white balance gains.
Definition awb.h:24
libcamera::ipa::AwbStats
An abstraction class wrapping hardware-specific AWB statistics.
Definition awb.h:28
libcamera::ipa::AwbStats::computeColourError
virtual double computeColourError(const RGB< double > &gains) const =0
Compute an error value for when the given gains would be applied.
libcamera::ipa::AwbStats::rgbMeans
virtual RGB< double > rgbMeans() const =0
Get RGB means of the statistics.
vector.h
Vector class.
yaml_parser.h
A YAML parser helper.