libcamera/jmondi/libcamera.git - Jacopo Mondi's clone of libcamera

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/* SPDX-License-Identifier: BSD-2-Clause */ /* * Copyright (C) 2019, Raspberry Pi (Trading) Limited * * ccm.cpp - CCM (colour correction matrix) control algorithm */ #include "../awb_status.h" #include "../ccm_status.h" #include "../logging.hpp" #include "../lux_status.h" #include "../metadata.hpp" #include "ccm.hpp" using namespace RPiController; // 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; } void Matrix::Read(boost::property_tree::ptree const &params) { double *ptr = (double *)m; int n = 0; for (auto it = params.begin(); it != params.end(); it++) { if (n++ == 9) throw std::runtime_error("Ccm: too many values in CCM"); *ptr++ = it->second.get_value<double>(); } if (n < 9) throw std::runtime_error("Ccm: too few values in CCM"); } Ccm::Ccm(Controller *controller) : CcmAlgorithm(controller), saturation_(1.0) {} char const *Ccm::Name() const { return NAME; } void Ccm::Read(boost::property_tree::ptree const &params) { if (params.get_child_optional("saturation")) config_.saturation.Read(params.get_child("saturation")); for (auto &p : params.get_child("ccms")) { CtCcm ct_ccm; ct_ccm.ct = p.second.get<double>("ct"); ct_ccm.ccm.Read(p.second.get_child("ccm")); if (!config_.ccms.empty() && ct_ccm.ct <= config_.ccms.back().ct) throw std::runtime_error( "Ccm: CCM not in increasing colour temperature order"); config_.ccms.push_back(std::move(ct_ccm)); } if (config_.ccms.empty()) throw std::runtime_error("Ccm: no CCMs specified"); } void Ccm::SetSaturation(double saturation) { saturation_ = saturation; } void Ccm::Initialise() {} template<typename T> static bool get_locked(Metadata *metadata, std::string const &tag, T &value) { T *ptr = metadata->GetLocked<T>(tag); if (ptr == nullptr) return false; value = *ptr; return true; } Matrix calculate_ccm(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 apply_saturation(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 *image_metadata) { bool awb_ok = false, lux_ok = false; struct AwbStatus awb = {}; awb.temperature_K = 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(*image_metadata); awb_ok = get_locked(image_metadata, "awb.status", awb); lux_ok = get_locked(image_metadata, "lux.status", lux); } if (!awb_ok) RPI_WARN("Ccm: no colour temperature found"); if (!lux_ok) RPI_WARN("Ccm: no lux value found"); Matrix ccm = calculate_ccm(config_.ccms, awb.temperature_K); double saturation = saturation_; struct CcmStatus ccm_status; ccm_status.saturation = saturation; if (!config_.saturation.Empty()) saturation *= config_.saturation.Eval( config_.saturation.Domain().Clip(lux.lux)); ccm = apply_saturation(ccm, saturation); for (int j = 0; j < 3; j++) for (int i = 0; i < 3; i++) ccm_status.matrix[j * 3 + i] = std::max(-8.0, std::min(7.9999, ccm.m[j][i])); RPI_LOG("CCM: colour temperature " << awb.temperature_K << "K"); RPI_LOG("CCM: " << ccm_status.matrix[0] << " " << ccm_status.matrix[1] << " " << ccm_status.matrix[2] << " " << ccm_status.matrix[3] << " " << ccm_status.matrix[4] << " " << ccm_status.matrix[5] << " "


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