Linux下使用Opencv打开笔记本摄像头

新建test文件夹，文件夹存在test.cpp和CMakeLists.txt

test.cpp#include <iostream>
#include <string>
#include <sstream>#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>
#include <opencv2/videoio.hpp> using namespace cv;
using namespace std;const char* keys =
{"{help h usage ? | | print this message}""{@video | | Video file, if not defined try to use webcamera}"
};int main(int argc, const char** argv)
{CommandLineParser parser(argc, argv, keys);parser.about("Reading a video and camera v1.0.0");if (parser.has("help")){parser.printMessage();return 0;}String videoFile = parser.get<String>(0);if (!parser.check()){parser.printErrors();return 0;}VideoCapture cap; if (videoFile != ""){cap.open(videoFile);// read a video file}else {cap.open(0);// read the default caera
    }if (!cap.isOpened())// check if we succeeded
    {return -1;}namedWindow("Video", 1);while (1){Mat frame;cap >> frame; // get a new frame from cameraimshow("Video", frame);if (waitKey(30) >= 0) break;}// Release the camera or video file
    cap.release();return 0;
}

CMakeLists.txt

project(test)cmake_minimum_required(VERSION 2.8.7)# option to enable OpenMP; only relevant for the KCF version with the
# VOT scale estimation
option(WITH_OPENMP "Enable OpenMP" OFF)if(WITH_OPENMP)find_package(OpenMP REQUIRED)set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}")
endif(WITH_OPENMP)# add c++11 support
if(CMAKE_COMPILER_IS_GNUCC)ADD_DEFINITIONS ( -std=c++11 )
endif(CMAKE_COMPILER_IS_GNUCC)# add OpenCV
set(OPENCV_DIR_HINT "")if(WIN32)get_filename_component(OPENCV_DIR_PLATFORM $ENV{OPENCV_DIR} DIRECTORY)get_filename_component(OPENCV_DIR_HINT ${OPENCV_DIR_PLATFORM} DIRECTORY)
endif(WIN32)set(OpenCV_STATIC OFF)
find_package(OpenCV REQUIRED HINTS ${OPENCV_DIR_HINT})

编译过程：

> cd test
> g++ test.cpp -o test `pkg-config --cflags --libs opencv`
> ./test

转载于:https://www.cnblogs.com/wangyarui/p/7265171.html

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