From 0db2c8dc75e466e7648dc1b95380495c6a126349 Mon Sep 17 00:00:00 2001 From: Naushir Patuck Date: Sun, 3 May 2020 16:48:42 +0100 Subject: libcamera: ipa: Raspberry Pi IPA Initial implementation of the Raspberry Pi (BCM2835) libcamera IPA and associated libraries. All code is licensed under the BSD-2-Clause terms. Copyright (c) 2019-2020 Raspberry Pi Trading Ltd. Signed-off-by: Naushir Patuck Acked-by: Laurent Pinchart Signed-off-by: Laurent Pinchart --- src/ipa/raspberrypi/controller/rpi/noise.cpp | 71 ++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 src/ipa/raspberrypi/controller/rpi/noise.cpp (limited to 'src/ipa/raspberrypi/controller/rpi/noise.cpp') diff --git a/src/ipa/raspberrypi/controller/rpi/noise.cpp b/src/ipa/raspberrypi/controller/rpi/noise.cpp new file mode 100644 index 00000000..2209d791 --- /dev/null +++ b/src/ipa/raspberrypi/controller/rpi/noise.cpp @@ -0,0 +1,71 @@ +/* SPDX-License-Identifier: BSD-2-Clause */ +/* + * Copyright (C) 2019, Raspberry Pi (Trading) Limited + * + * noise.cpp - Noise control algorithm + */ + +#include + +#include "../device_status.h" +#include "../logging.hpp" +#include "../noise_status.h" + +#include "noise.hpp" + +using namespace RPi; + +#define NAME "rpi.noise" + +Noise::Noise(Controller *controller) + : Algorithm(controller), mode_factor_(1.0) +{ +} + +char const *Noise::Name() const +{ + return NAME; +} + +void Noise::SwitchMode(CameraMode const &camera_mode) +{ + // For example, we would expect a 2x2 binned mode to have a "noise + // factor" of sqrt(2x2) = 2. (can't be less than one, right?) + mode_factor_ = std::max(1.0, camera_mode.noise_factor); +} + +void Noise::Read(boost::property_tree::ptree const ¶ms) +{ + RPI_LOG(Name()); + reference_constant_ = params.get("reference_constant"); + reference_slope_ = params.get("reference_slope"); +} + +void Noise::Prepare(Metadata *image_metadata) +{ + struct DeviceStatus device_status; + device_status.analogue_gain = 1.0; // keep compiler calm + if (image_metadata->Get("device.status", device_status) == 0) { + // There is a slight question as to exactly how the noise + // profile, specifically the constant part of it, scales. For + // now we assume it all scales the same, and we'll revisit this + // if it proves substantially wrong. NOTE: we may also want to + // make some adjustments based on the camera mode (such as + // binning), if we knew how to discover it... + double factor = sqrt(device_status.analogue_gain) / mode_factor_; + struct NoiseStatus status; + status.noise_constant = reference_constant_ * factor; + status.noise_slope = reference_slope_ * factor; + image_metadata->Set("noise.status", status); + RPI_LOG(Name() << ": constant " << status.noise_constant + << " slope " << status.noise_slope); + } else + RPI_WARN(Name() << " no metadata"); +} + +// Register algorithm with the system. +static Algorithm *Create(Controller *controller) +{ + return new Noise(controller); +} +static RegisterAlgorithm reg(NAME, &Create); -- cgit v1.2.1