libcamera/libcamera.git - libcamera official repository

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author	David Plowman <david.plowman@raspberrypi.com>	2020-11-23 07:38:03 +0000
committer	Kieran Bingham <kieran.bingham@ideasonboard.com>	2020-11-23 14:24:45 +0000
commit	7de5506c30b36575de7bbead7fda243ec1019005 (patch)
tree	58886fe65956fb26ae80f6ecbd21a53dba43c62e /src/ipa/raspberrypi/controller/histogram.hpp
parent	393f05a9a8044dba26251ba5a4b0827b714cd15f (diff)

libcamera: src: ipa: raspberrypi: agc: Improve gain update calculation for partly saturated images

When parts of an image saturate then the image brightness no longer increases linearly with increased exposure/gain. Having calculated a linear gain value it's better then to try it, allowing for saturating regions, and if necessary increase the gain some more. We repeat this several times. Signed-off-by: David Plowman <david.plowman@raspberrypi.com> Reviewed-by: Naushir Patuck <naush@raspberrypi.com> Acked-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

Diffstat (limited to 'src/ipa/raspberrypi/controller/histogram.hpp')

0 files changed, 0 insertions, 0 deletions

/* SPDX-License-Identifier: GPL-2.0-or-later */ /* * Copyright (C) 2020, Umang Jain <email@uajain.com> * * hotplug-cameras.cpp - Test cameraAdded/cameraRemoved signals in CameraManager */ #include <dirent.h> #include <fstream> #include <iostream> #include <string.h> #include <unistd.h> #include <libcamera/camera.h> #include <libcamera/camera_manager.h> #include "libcamera/internal/event_dispatcher.h" #include "libcamera/internal/file.h" #include "libcamera/internal/thread.h" #include "libcamera/internal/timer.h" #include "test.h" using namespace libcamera; class HotplugTest : public Test { protected: void cameraAddedHandler([[maybe_unused]] std::shared_ptr<Camera> cam) { cameraAdded_ = true; } void cameraRemovedHandler([[maybe_unused]] std::shared_ptr<Camera> cam) { cameraRemoved_ = true; } int init() { if (!File::exists("/sys/module/uvcvideo")) { std::cout << "uvcvideo driver is not loaded, skipping" << std::endl; return TestSkip; } if (geteuid() != 0) { std::cout << "This test requires root permissions, skipping" << std::endl; return TestSkip; } cm_ = new CameraManager(); if (cm_->start()) { std::cout << "Failed to start camera manager" << std::endl; return TestFail; } cameraAdded_ = false; cameraRemoved_ = false; cm_->cameraAdded.connect(this, &HotplugTest::cameraAddedHandler); cm_->cameraRemoved.connect(this, &HotplugTest::cameraRemovedHandler); return 0; } int run() { DIR *dir; struct dirent *dirent; std::string uvcDeviceDir; dir = opendir(uvcDriverDir_.c_str()); /* Find a UVC device directory, which we can bind/unbind. */ while ((dirent = readdir(dir)) != nullptr) { if (!File::exists(uvcDriverDir_ + dirent->d_name + "/video4linux")) continue; uvcDeviceDir = dirent->d_name; break; } closedir(dir); /* If no UVC device found, skip the test. */ if (uvcDeviceDir.empty()) return TestSkip; /* Unbind a camera and process events. */ std::ofstream(uvcDriverDir_ + "unbind", std::ios::binary) << uvcDeviceDir; Timer timer; timer.start(1000); while (timer.isRunning() && !cameraRemoved_) Thread::current()->eventDispatcher()->processEvents(); if (!cameraRemoved_) { std::cout << "Camera unplug not detected" << std::endl; return TestFail; } /* Bind the camera again and process events. */ std::ofstream(uvcDriverDir_ + "bind", std::ios::binary) << uvcDeviceDir; timer.start(1000); while (timer.isRunning() && !cameraAdded_) Thread::current()->eventDispatcher()->processEvents(); if (!cameraAdded_) { std::cout << "Camera plug not detected" << std::endl; return TestFail; } return TestPass; } void cleanup() { cm_->stop(); delete cm_; } private: CameraManager *cm_; static const std::string uvcDriverDir_; bool cameraRemoved_; bool cameraAdded_; }; const std::string HotplugTest::uvcDriverDir_ = "/sys/bus/usb/drivers/uvcvideo/"; TEST_REGISTER(HotplugTest)


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