Use Opencv in Linux to open the laptop camera, and use linuxopencv

Use Opencv in Linux to open the laptop camera, and use linuxopencv

NewTestFolder. The folder exists.Test. cppAndCMakeLists.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 camera imshow ("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 estimationoption(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 supportif(CMAKE_COMPILER_IS_GNUCC)    ADD_DEFINITIONS ( -std=c++11 )endif(CMAKE_COMPILER_IS_GNUCC)# add OpenCVset(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})

Compilation process:

 

> Cd test
> G ++ test. cpp-o test 'pkg-config -- cflags -- libs opencv'
>./Test