libcamera v0.5.0 Supporting cameras in Linux since 2019 |

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awb.h
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1/* SPDX-License-Identifier: LGPL-2.1-or-later */
2/*
3 * Copyright (C) 2024 Ideas on Board Oy
4 *
5 * Generic AWB algorithms
6 */
7
8#pragma once
9
10#include <map>
11
12#include <libcamera/control_ids.h>
13#include <libcamera/controls.h>
14
15#include "libcamera/internal/vector.h"
16#include "libcamera/internal/yaml_parser.h"
17
18 namespace libcamera {
19
20 namespace ipa {
21
22 struct AwbResult {
23 RGB<double> gains;
24 double colourTemperature;
25};
26
27 struct AwbStats {
28 virtual double computeColourError(const RGB<double> &gains) const = 0;
29 virtual RGB<double> rgbMeans() const = 0;
30
31 protected:
32 ~AwbStats() = default;
33};
34
35 class AwbAlgorithm
36{
37 public:
38 virtual ~AwbAlgorithm() = default;
39
40 virtual int init(const YamlObject &tuningData) = 0;
41 virtual AwbResult calculateAwb(const AwbStats &stats, unsigned int lux) = 0;
42 virtual RGB<double> gainsFromColourTemperature(double colourTemperature) = 0;
43
44 const ControlInfoMap::Map &controls() const
45 {
46 return controls_;
47 }
48
49 virtual void handleControls([[maybe_unused]] const ControlList &controls) {}
50
51 protected:
52 int parseModeConfigs(const YamlObject &tuningData,
53 const ControlValue &def = {});
54
55 struct ModeConfig {
56 double ctHi;
57 double ctLo;
58 };
59
60 ControlInfoMap::Map controls_;
61 std::map<controls::AwbModeEnum, AwbAlgorithm::ModeConfig> modes_;
62};
63
64} /* namespace ipa */
65
66} /* namespace libcamera */
libcamera::ControlInfoMap::Map
std::unordered_map< const ControlId *, ControlInfo > Map
The base std::unsorted_map<> container.
Definition controls.h:369
libcamera::ControlList
Associate a list of ControlId with their values for an object.
Definition controls.h:411
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:36
libcamera::ipa::AwbAlgorithm::controls
const ControlInfoMap::Map & controls() const
Get the controls info map for this algorithm.
Definition awb.h:44
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:60
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 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:49
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:61
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:292
libcamera::ipa::AwbAlgorithm::ModeConfig
Holds the configuration of a single AWB mode.
Definition awb.h:55
libcamera::ipa::AwbAlgorithm::ModeConfig::ctLo
double ctLo
The lowest valid colour temperature of that mode.
Definition awb.h:57
libcamera::ipa::AwbAlgorithm::ModeConfig::ctHi
double ctHi
The highest valid colour temperature of that mode.
Definition awb.h:56
libcamera::ipa::AwbResult
The result of an AWB calculation.
Definition awb.h:22
libcamera::ipa::AwbResult::colourTemperature
double colourTemperature
The calculated colour temperature in Kelvin.
Definition awb.h:24
libcamera::ipa::AwbResult::gains
RGB< double > gains
The calculated white balance gains.
Definition awb.h:23
libcamera::ipa::AwbStats
An abstraction class wrapping hardware-specific AWB statistics.
Definition awb.h:27
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.