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-rw-r--r--src/ipa/rkisp1/algorithms/awb.cpp178
-rw-r--r--src/ipa/rkisp1/algorithms/awb.h33
-rw-r--r--src/ipa/rkisp1/algorithms/meson.build1
-rw-r--r--src/ipa/rkisp1/ipa_context.cpp28
-rw-r--r--src/ipa/rkisp1/ipa_context.h16
-rw-r--r--src/ipa/rkisp1/rkisp1.cpp2
6 files changed, 258 insertions, 0 deletions
diff --git a/src/ipa/rkisp1/algorithms/awb.cpp b/src/ipa/rkisp1/algorithms/awb.cpp
new file mode 100644
index 00000000..be4585c6
--- /dev/null
+++ b/src/ipa/rkisp1/algorithms/awb.cpp
@@ -0,0 +1,178 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021-2022, Ideas On Board
+ *
+ * awb.cpp - AWB control algorithm
+ */
+
+#include "awb.h"
+
+#include <algorithm>
+#include <cmath>
+
+#include <libcamera/base/log.h>
+
+#include <libcamera/ipa/core_ipa_interface.h>
+
+/**
+ * \file awb.h
+ */
+
+namespace libcamera {
+
+namespace ipa::rkisp1::algorithms {
+
+/**
+ * \class Awb
+ * \brief A Grey world white balance correction algorithm
+ */
+
+LOG_DEFINE_CATEGORY(RkISP1Awb)
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::configure
+ */
+int Awb::configure(IPAContext &context,
+ const IPACameraSensorInfo &configInfo)
+{
+ context.frameContext.awb.gains.red = 1.0;
+ context.frameContext.awb.gains.blue = 1.0;
+ context.frameContext.awb.gains.green = 1.0;
+
+ /*
+ * Define the measurement window for AWB as a centered rectangle
+ * covering 3/4 of the image width and height.
+ */
+ context.configuration.awb.measureWindow.h_offs = configInfo.outputSize.width / 8;
+ context.configuration.awb.measureWindow.v_offs = configInfo.outputSize.height / 8;
+ context.configuration.awb.measureWindow.h_size = 3 * configInfo.outputSize.width / 4;
+ context.configuration.awb.measureWindow.v_size = 3 * configInfo.outputSize.height / 4;
+
+ return 0;
+}
+
+uint32_t Awb::estimateCCT(double red, double green, double blue)
+{
+ /* Convert the RGB values to CIE tristimulus values (XYZ) */
+ double X = (-0.14282) * (red) + (1.54924) * (green) + (-0.95641) * (blue);
+ double Y = (-0.32466) * (red) + (1.57837) * (green) + (-0.73191) * (blue);
+ double Z = (-0.68202) * (red) + (0.77073) * (green) + (0.56332) * (blue);
+
+ /* Calculate the normalized chromaticity values */
+ double x = X / (X + Y + Z);
+ double y = Y / (X + Y + Z);
+
+ /* Calculate CCT */
+ double n = (x - 0.3320) / (0.1858 - y);
+ return 449 * n * n * n + 3525 * n * n + 6823.3 * n + 5520.33;
+}
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::prepare
+ */
+void Awb::prepare(IPAContext &context, rkisp1_params_cfg *params)
+{
+ params->others.awb_gain_config.gain_green_b = 256 * context.frameContext.awb.gains.green;
+ params->others.awb_gain_config.gain_blue = 256 * context.frameContext.awb.gains.blue;
+ params->others.awb_gain_config.gain_red = 256 * context.frameContext.awb.gains.red;
+ params->others.awb_gain_config.gain_green_r = 256 * context.frameContext.awb.gains.green;
+
+ /* Update the gains. */
+ params->module_cfg_update |= RKISP1_CIF_ISP_MODULE_AWB_GAIN;
+
+ /* If we already have configured the gains and window, return. */
+ if (context.frameContext.frameCount > 0)
+ return;
+
+ /* Configure the gains to apply. */
+ params->module_en_update |= RKISP1_CIF_ISP_MODULE_AWB_GAIN;
+ /* Update the ISP to apply the gains configured. */
+ params->module_ens |= RKISP1_CIF_ISP_MODULE_AWB_GAIN;
+
+ /* Configure the measure window for AWB. */
+ params->meas.awb_meas_config.awb_wnd = context.configuration.awb.measureWindow;
+ /*
+ * Measure Y, Cr and Cb means.
+ * \todo RGB is not working, the kernel seems to not configure it ?
+ */
+ params->meas.awb_meas_config.awb_mode = RKISP1_CIF_ISP_AWB_MODE_YCBCR;
+ /* Reference Cr and Cb. */
+ params->meas.awb_meas_config.awb_ref_cb = 128;
+ params->meas.awb_meas_config.awb_ref_cr = 128;
+ /* Y values to include are between min_y and max_y only. */
+ params->meas.awb_meas_config.min_y = 16;
+ params->meas.awb_meas_config.max_y = 250;
+ /* Maximum Cr+Cb value to take into account for awb. */
+ params->meas.awb_meas_config.max_csum = 250;
+ /* Minimum Cr and Cb values to take into account. */
+ params->meas.awb_meas_config.min_c = 16;
+ /* Number of frames to use to estimate the mean (0 means 1 frame). */
+ params->meas.awb_meas_config.frames = 0;
+
+ /* Update AWB measurement unit configuration. */
+ params->module_cfg_update |= RKISP1_CIF_ISP_MODULE_AWB;
+ /* Make sure the ISP is measuring the means for the next frame. */
+ params->module_en_update |= RKISP1_CIF_ISP_MODULE_AWB;
+ params->module_ens |= RKISP1_CIF_ISP_MODULE_AWB;
+}
+
+/**
+ * \copydoc libcamera::ipa::Algorithm::process
+ */
+void Awb::process([[maybe_unused]] IPAContext &context, const rkisp1_stat_buffer *stats)
+{
+ const rkisp1_cif_isp_stat *params = &stats->params;
+ const rkisp1_cif_isp_awb_stat *awb = &params->awb;
+ IPAFrameContext &frameContext = context.frameContext;
+
+ /* Get the YCbCr mean values */
+ double yMean = awb->awb_mean[0].mean_y_or_g;
+ double crMean = awb->awb_mean[0].mean_cr_or_r;
+ double cbMean = awb->awb_mean[0].mean_cb_or_b;
+
+ /*
+ * Convert from YCbCr to RGB.
+ * The hardware uses the following formulas:
+ * Y = 16 + 0.2500 R + 0.5000 G + 0.1094 B
+ * Cb = 128 - 0.1406 R - 0.2969 G + 0.4375 B
+ * Cr = 128 + 0.4375 R - 0.3750 G - 0.0625 B
+ *
+ * The inverse matrix is thus:
+ * [[1,1636, -0,0623, 1,6008]
+ * [1,1636, -0,4045, -0,7949]
+ * [1,1636, 1,9912, -0,0250]]
+ */
+ yMean -= 16;
+ cbMean -= 128;
+ crMean -= 128;
+ double redMean = 1.1636 * yMean - 0.0623 * cbMean + 1.6008 * crMean;
+ double greenMean = 1.1636 * yMean - 0.4045 * cbMean - 0.7949 * crMean;
+ double blueMean = 1.1636 * yMean + 1.9912 * cbMean - 0.0250 * crMean;
+
+ /* Estimate the red and blue gains to apply in a grey world. */
+ double redGain = greenMean / (redMean + 1);
+ double blueGain = greenMean / (blueMean + 1);
+
+ /* Filter the values to avoid oscillations. */
+ double speed = 0.2;
+ redGain = speed * redGain + (1 - speed) * frameContext.awb.gains.red;
+ blueGain = speed * blueGain + (1 - speed) * frameContext.awb.gains.blue;
+
+ /*
+ * Gain values are unsigned integer value, range 0 to 4 with 8 bit
+ * fractional part.
+ */
+ frameContext.awb.gains.red = std::clamp(redGain, 0.0, 1023.0 / 256);
+ frameContext.awb.gains.blue = std::clamp(blueGain, 0.0, 1023.0 / 256);
+ /* Hardcode the green gain to 1.0. */
+ frameContext.awb.gains.green = 1.0;
+
+ frameContext.awb.temperatureK = estimateCCT(redMean, greenMean, blueMean);
+
+ LOG(RkISP1Awb, Debug) << "Gain found for red: " << context.frameContext.awb.gains.red
+ << " and for blue: " << context.frameContext.awb.gains.blue;
+}
+
+} /* namespace ipa::rkisp1::algorithms */
+
+} /* namespace libcamera */
diff --git a/src/ipa/rkisp1/algorithms/awb.h b/src/ipa/rkisp1/algorithms/awb.h
new file mode 100644
index 00000000..11946643
--- /dev/null
+++ b/src/ipa/rkisp1/algorithms/awb.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2021-2022, Ideas On Board
+ *
+ * awb.h - AWB control algorithm
+ */
+
+#pragma once
+
+#include <linux/rkisp1-config.h>
+
+#include "algorithm.h"
+
+namespace libcamera {
+
+namespace ipa::rkisp1::algorithms {
+
+class Awb : public Algorithm
+{
+public:
+ Awb() = default;
+ ~Awb() = default;
+
+ int configure(IPAContext &context, const IPACameraSensorInfo &configInfo) override;
+ void prepare(IPAContext &context, rkisp1_params_cfg *params) override;
+ void process(IPAContext &context, const rkisp1_stat_buffer *stats) override;
+
+private:
+ uint32_t estimateCCT(double red, double green, double blue);
+};
+
+} /* namespace ipa::rkisp1::algorithms */
+} /* namespace libcamera */
diff --git a/src/ipa/rkisp1/algorithms/meson.build b/src/ipa/rkisp1/algorithms/meson.build
index 27c97731..7ec53d89 100644
--- a/src/ipa/rkisp1/algorithms/meson.build
+++ b/src/ipa/rkisp1/algorithms/meson.build
@@ -2,5 +2,6 @@
rkisp1_ipa_algorithms = files([
'agc.cpp',
+ 'awb.cpp',
'blc.cpp',
])
diff --git a/src/ipa/rkisp1/ipa_context.cpp b/src/ipa/rkisp1/ipa_context.cpp
index 4a1ab058..1559d3ff 100644
--- a/src/ipa/rkisp1/ipa_context.cpp
+++ b/src/ipa/rkisp1/ipa_context.cpp
@@ -82,6 +82,14 @@ namespace libcamera::ipa::rkisp1 {
*/
/**
+ * \var IPASessionConfiguration::awb
+ * \brief AWB parameters configuration of the IPA
+ *
+ * \var IPASessionConfiguration::awb.measureWindow
+ * \brief AWB measure window
+ */
+
+/**
* \var IPASessionConfiguration::sensor
* \brief Sensor-specific configuration of the IPA
*
@@ -106,6 +114,26 @@ namespace libcamera::ipa::rkisp1 {
*/
/**
+ * \var IPAFrameContext::awb
+ * \brief Context for the Automatic White Balance algorithm
+ *
+ * \struct IPAFrameContext::awb.gains
+ * \brief White balance gains
+ *
+ * \var IPAFrameContext::awb.gains.red
+ * \brief White balance gain for R channel
+ *
+ * \var IPAFrameContext::awb.gains.green
+ * \brief White balance gain for G channel
+ *
+ * \var IPAFrameContext::awb.gains.blue
+ * \brief White balance gain for B channel
+ *
+ * \var IPAFrameContext::awb.temperatureK
+ * \brief Estimated color temperature
+ */
+
+/**
* \var IPAFrameContext::sensor
* \brief Effective sensor values
*
diff --git a/src/ipa/rkisp1/ipa_context.h b/src/ipa/rkisp1/ipa_context.h
index 35e9b8e5..f387cace 100644
--- a/src/ipa/rkisp1/ipa_context.h
+++ b/src/ipa/rkisp1/ipa_context.h
@@ -12,6 +12,8 @@
#include <libcamera/base/utils.h>
+#include <libcamera/geometry.h>
+
namespace libcamera {
namespace ipa::rkisp1 {
@@ -26,6 +28,10 @@ struct IPASessionConfiguration {
} agc;
struct {
+ struct rkisp1_cif_isp_window measureWindow;
+ } awb;
+
+ struct {
utils::Duration lineDuration;
} sensor;
@@ -41,6 +47,16 @@ struct IPAFrameContext {
} agc;
struct {
+ struct {
+ double red;
+ double green;
+ double blue;
+ } gains;
+
+ double temperatureK;
+ } awb;
+
+ struct {
uint32_t exposure;
double gain;
} sensor;
diff --git a/src/ipa/rkisp1/rkisp1.cpp b/src/ipa/rkisp1/rkisp1.cpp
index 83ed21be..13ab1cdc 100644
--- a/src/ipa/rkisp1/rkisp1.cpp
+++ b/src/ipa/rkisp1/rkisp1.cpp
@@ -27,6 +27,7 @@
#include "algorithms/agc.h"
#include "algorithms/algorithm.h"
+#include "algorithms/awb.h"
#include "algorithms/blc.h"
#include "libipa/camera_sensor_helper.h"
@@ -121,6 +122,7 @@ int IPARkISP1::init(const IPASettings &settings, unsigned int hwRevision)
/* Construct our Algorithms */
algorithms_.push_back(std::make_unique<algorithms::Agc>());
+ algorithms_.push_back(std::make_unique<algorithms::Awb>());
algorithms_.push_back(std::make_unique<algorithms::BlackLevelCorrection>());
return 0;
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-19 02:29:51 +0000