Linux下利用Opencv打开笔记本摄像头问题

新建test文件夹，文件夹存在test.cpp和cmakelists.txttest.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 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

总结

以上所述是小编给大家介绍的linux下利用opencv打开笔记本摄像头问题，希望对大家有所帮助