@@ -35,7 +35,17 @@ struct DebayerParams {
static constexpr unsigned int kLscValuesPerCell = 4;
using LscLookupTable =
std::array<uint8_t, kLscGridSize * kLscGridSize * kLscValuesPerCell>;
- LscLookupTable lscLut{};
+ static constexpr auto identityLscLut = [] {
+ LscLookupTable lut = {};
+ /* lut.fill(64) could be used, but it fails with older gcc versions */
+ for (size_t i = 0; kLscValuesPerCell * i < lut.size(); i++) {
+ lut[i * kLscValuesPerCell + 0] = 64; /* == UQ<2, 6>(1.0f).quantized() */
+ lut[i * kLscValuesPerCell + 1] = 64;
+ lut[i * kLscValuesPerCell + 2] = 64;
+ }
+ return lut;
+ }();
+ LscLookupTable lscLut = identityLscLut;
uint64_t lscLutVersion = 0;
};
new file mode 100644
@@ -0,0 +1,96 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Lens shading correction
+ */
+
+#include "lsc.h"
+
+#include <libcamera/base/log.h>
+
+namespace libcamera {
+
+namespace ipa::soft::algorithms {
+
+LOG_DEFINE_CATEGORY(IPASoftLsc)
+
+int Lsc::init(IPAContext &context, const ValueNode &tuningData)
+{
+ static constexpr unsigned int kGridSize = DebayerParams::kLscGridSize;
+
+ for (unsigned int i = 0; i < kGridSize; i++)
+ gridPos_.push_back(static_cast<double>(i) / (kGridSize - 1));
+
+ return lscAlgo_.init(tuningData, context.ctrlMap,
+ { .keys = { "r", "g", "b" },
+ .numHSamples = kGridSize,
+ .numVSamples = kGridSize,
+ .sensorSize = context.sensorInfo.activeAreaSize });
+}
+
+int Lsc::configure(IPAContext &context,
+ [[maybe_unused]] const IPAConfigInfo &configInfo)
+{
+ return lscAlgo_.configure(context.activeState.lsc,
+ context.sensorInfo.analogCrop,
+ gridPos_, gridPos_);
+}
+
+void Lsc::prepare([[maybe_unused]] IPAContext &context,
+ [[maybe_unused]] const uint32_t frame,
+ IPAFrameContext &frameContext,
+ DebayerParams *params)
+{
+ unsigned int ct = frameContext.awb.colourTemperature;
+ constexpr unsigned int minTemperatureChange = 100;
+
+ if (!frameContext.lsc.enabled) {
+ if (lastAppliedCt_ != 0) {
+ params->lscLut = DebayerParams::identityLscLut;
+ lastAppliedCt_ = 0;
+ }
+ return;
+ }
+
+ if (utils::abs_diff(ct, lastAppliedCt_) < minTemperatureChange)
+ return;
+
+ const auto &set = lscAlgo_.interpolateComponents(ct);
+
+ const auto &red = set.at("r");
+ const auto &green = set.at("g");
+ const auto &blue = set.at("b");
+
+ DebayerParams::LscLookupTable &lut = params->lscLut;
+ constexpr unsigned int gridSize = DebayerParams::kLscGridSize;
+ for (unsigned int i = 0, j = 0; i < gridSize * gridSize; i++) {
+ lut[j++] = red[i];
+ lut[j++] = green[i];
+ lut[j++] = blue[i];
+ lut[j++] = 0; /* padding */
+ }
+ params->lscLutVersion++;
+
+ lastAppliedCt_ = ct;
+}
+
+void Lsc::queueRequest(IPAContext &context, [[maybe_unused]] const uint32_t frame,
+ IPAFrameContext &frameContext, const ControlList &controls)
+{
+ lscAlgo_.queueRequest(context.activeState.lsc, frameContext.lsc,
+ controls);
+}
+
+void Lsc::process([[maybe_unused]] IPAContext &context,
+ [[maybe_unused]] const uint32_t frame,
+ IPAFrameContext &frameContext,
+ [[maybe_unused]] const SwIspStats *stats,
+ ControlList &metadata)
+{
+ lscAlgo_.process(frameContext.lsc, metadata);
+}
+
+REGISTER_IPA_ALGORITHM(Lsc, "Lsc")
+
+} /* namespace ipa::soft::algorithms */
+
+} /* namespace libcamera */
new file mode 100644
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Lens shading correction
+ */
+
+#pragma once
+
+#include <libipa/interpolator.h>
+
+#include "libipa/fixedpoint.h"
+#include "libipa/lsc.h"
+
+#include "algorithm.h"
+#include "ipa_context.h"
+
+namespace libcamera {
+
+namespace ipa {
+
+namespace soft::algorithms {
+
+class Lsc : public Algorithm
+{
+public:
+ Lsc() = default;
+ ~Lsc() = default;
+
+ int init(IPAContext &context, const ValueNode &tuningData) override;
+ int configure(IPAContext &context,
+ const IPAConfigInfo &configInfo) override;
+ void queueRequest(IPAContext &context, [[maybe_unused]] const uint32_t frame,
+ IPAFrameContext &frameContext, const ControlList &controls) override;
+ void prepare(IPAContext &context,
+ const uint32_t frame,
+ IPAFrameContext &frameContext,
+ DebayerParams *params) override;
+ void process([[maybe_unused]] IPAContext &context,
+ [[maybe_unused]] const uint32_t frame,
+ IPAFrameContext &frameContext,
+ [[maybe_unused]] const SwIspStats *stats,
+ ControlList &metadata) override;
+
+private:
+ LscAlgorithm<UQ<2, 6>> lscAlgo_;
+
+ std::vector<double> gridPos_;
+
+ unsigned int lastAppliedCt_ = 0;
+};
+
+} /* namespace soft::algorithms */
+
+} /* namespace ipa */
+
+} /* namespace libcamera */
@@ -6,4 +6,5 @@ soft_simple_ipa_algorithms = files([
'agc.cpp',
'blc.cpp',
'ccm.cpp',
+ 'lsc.cpp',
])
@@ -19,6 +19,7 @@
#include <libipa/awb.h>
#include <libipa/ccm.h>
#include <libipa/fc_queue.h>
+#include "libipa/lsc.h"
#include "core_ipa_interface.h"
@@ -61,6 +62,8 @@ struct IPAActiveState {
std::optional<float> contrast;
std::optional<float> saturation;
} knobs;
+
+ ipa::lsc::ActiveState lsc;
};
struct IPAFrameContext : public FrameContext {
@@ -75,6 +78,7 @@ struct IPAFrameContext : public FrameContext {
float gamma;
std::optional<float> contrast;
std::optional<float> saturation;
+ ipa::lsc::FrameContext lsc;
};
struct IPAContext {
@@ -89,6 +93,7 @@ struct IPAContext {
FCQueue<IPAFrameContext> frameContexts;
ControlInfoMap::Map ctrlMap;
bool ccmEnabled = false;
+ ipa::lsc::ActiveState lsc;
};
} /* namespace ipa::soft */
@@ -163,6 +163,8 @@ int IPASoftSimple::init(const IPASettings &settings,
params_->gamma = 1.0 / algorithms::kDefaultGamma;
params_->contrastExp = 1.0;
params_->gains = { { 1.0, 1.0, 1.0 } };
+ params_->lscLutVersion = 0;
+ params_->lscLut = DebayerParams::identityLscLut;
/* combinedMatrix is reset for each frame. */
}
@@ -66,6 +66,14 @@ namespace libcamera {
* \brief Lens shading lookup table
*/
+/**
+ * \var DebayerParams::identityLscLut
+ * \brief Lens shading lookup table of identity mapping
+ *
+ * This table can be used to initialise the lens shading lookup table or to
+ * not apply any real lens shading correction.
+ */
+
/**
* \var DebayerParams::lscLutVersion
* \brief Incremented on each \a lscLut change