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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2019, Raspberry Pi Ltd
*
* ccm.cpp - CCM (colour correction matrix) control algorithm
*/
#include <libcamera/base/log.h>
#include "../awb_status.h"
#include "../ccm_status.h"
#include "../lux_status.h"
#include "../metadata.h"
#include "ccm.h"
using namespace RPiController;
using namespace libcamera;
LOG_DEFINE_CATEGORY(RPiCcm)
/*
* This algorithm selects a CCM (Colour Correction Matrix) according to the
* colour temperature estimated by AWB (interpolating between known matricies as
* necessary). Additionally the amount of colour saturation can be controlled
* both according to the current estimated lux level and according to a
* saturation setting that is exposed to applications.
*/
#define NAME "rpi.ccm"
Matrix::Matrix()
{
memset(m, 0, sizeof(m));
}
Matrix::Matrix(double m0, double m1, double m2, double m3, double m4, double m5,
double m6, double m7, double m8)
{
m[0][0] = m0, m[0][1] = m1, m[0][2] = m2, m[1][0] = m3, m[1][1] = m4,
m[1][2] = m5, m[2][0] = m6, m[2][1] = m7, m[2][2] = m8;
}
int Matrix::read(const libcamera::YamlObject ¶ms)
{
double *ptr = (double *)m;
if (params.size() != 9) {
LOG(RPiCcm, Error) << "Wrong number of values in CCM";
return -EINVAL;
}
for (const auto ¶m : params.asList()) {
auto value = param.get<double>();
if (!value)
return -EINVAL;
*ptr++ = *value;
}
return 0;
}
Ccm::Ccm(Controller *controller)
: CcmAlgorithm(controller), saturation_(1.0) {}
char const *Ccm::name() const
{
return NAME;
}
int Ccm::read(const libcamera::YamlObject ¶ms)
{
int ret;
if (params.contains("saturation")) {
ret = config_.saturation.read(params["saturation"]);
if (ret)
return ret;
}
for (auto &p : params["ccms"].asList()) {
auto value = p["ct"].get<double>();
if (!value)
return -EINVAL;
CtCcm ctCcm;
ctCcm.ct = *value;
ret = ctCcm.ccm.read(p["ccm"]);
if (ret)
return ret;
if (!config_.ccms.empty() && ctCcm.ct <= config_.ccms.back().ct) {
LOG(RPiCcm, Error)
<< "CCM not in increasing colour temperature order";
return -EINVAL;
}
config_.ccms.push_back(std::move(ctCcm));
}
if (config_.ccms.empty()) {
LOG(RPiCcm, Error) << "No CCMs specified";
return -EINVAL;
}
return 0;
}
void Ccm::setSaturation(double saturation)
{
saturation_ = saturation;
}
void Ccm::initialise()
{
}
template<typename T>
static bool getLocked(Metadata *metadata, std::string const &tag, T &value)
{
T *ptr = metadata->getLocked<T>(tag);
if (ptr == nullptr)
return false;
value = *ptr;
return true;
}
Matrix calculateCcm(std::vector<CtCcm> const &ccms, double ct)
{
if (ct <= ccms.front().ct)
return ccms.front().ccm;
else if (ct >= ccms.back().ct)
return ccms.back().ccm;
else {
int i = 0;
for (; ct > ccms[i].ct; i++)
;
double lambda =
(ct - ccms[i - 1].ct) / (ccms[i].ct - ccms[i - 1].ct);
return lambda * ccms[i].ccm + (1.0 - lambda) * ccms[i - 1].ccm;
}
}
Matrix applySaturation(Matrix const &ccm, double saturation)
{
Matrix RGB2Y(0.299, 0.587, 0.114, -0.169, -0.331, 0.500, 0.500, -0.419,
-0.081);
Matrix Y2RGB(1.000, 0.000, 1.402, 1.000, -0.345, -0.714, 1.000, 1.771,
0.000);
Matrix S(1, 0, 0, 0, saturation, 0, 0, 0, saturation);
return Y2RGB * S * RGB2Y * ccm;
}
void Ccm::prepare(Metadata *imageMetadata)
{
bool awbOk = false, luxOk = false;
struct AwbStatus awb = {};
awb.temperatureK = 4000; /* in case no metadata */
struct LuxStatus lux = {};
lux.lux = 400; /* in case no metadata */
{
/* grab mutex just once to get everything */
std::lock_guard<Metadata> lock(*imageMetadata);
awbOk = getLocked(imageMetadata, "awb.status", awb);
luxOk = getLocked(imageMetadata, "lux.status", lux);
}
if (!awbOk)
LOG(RPiCcm, Warning) << "no colour temperature found";
if (!luxOk)
LOG(RPiCcm, Warning) << "no lux value found";
Matrix ccm = calculateCcm(config_.ccms, awb.temperatureK);
double saturation = saturation_;
struct CcmStatus ccmStatus;
ccmStatus.saturation = saturation;
if (!config_.saturation.empty())
saturation *= config_.saturation.eval(
config_.saturation.domain().clip(lux.lux));
ccm = applySaturation(ccm, saturation);
for (int j = 0; j < 3; j++)
for (int i = 0; i < 3; i++)
ccmStatus.matrix[j * 3 + i] =
std::max(-8.0, std::min(7.9999, ccm.m[j][i]));
LOG(RPiCcm, Debug)
<< "colour temperature " << awb.temperatureK << "K";
LOG(RPiCcm, Debug)
<< "CCM: " << ccmStatus.matrix[0] << " " << ccmStatus.matrix[1]
<< " " << ccmStatus.matrix[2] << " "
<< ccmStatus.matrix[3] << " " << ccmStatus.matrix[4]
<< " " << ccmStatus.matrix[5] << " "
<< ccmStatus.matrix[6] << " " << ccmStatus.matrix[7]
<< " " << ccmStatus.matrix[8];
imageMetadata->set("ccm.status", ccmStatus);
}
/* Register algorithm with the system. */
static Algorithm *create(Controller *controller)
{
return (Algorithm *)new Ccm(controller);
;
}
static RegisterAlgorithm reg(NAME, &create);
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