Opencv 打开笔记本摄像头

1.安装Opencv

1.1 编译

$git clone https://github.com/opencv/opencv.git
$cd opencv/
$git checkout tags/3.2.0
$mkdir build
$cd build/
$cmake ..
$make

1.2 安装

sudo make install

install之后要执行ldconfig，否则程序可能找不到动态库

sudo ldconfig

检查系统当前opencv版本号

pkg-config --modversion opencv

2.打开摄像头

打开摄像头并将视频流写入到视频文件中

#include <opencv2/opencv.hpp>
#include <iostream>
#include <stdio.h>using namespace cv;
using namespace std;int main(int, char**)
{Mat src;// use default camera as video sourceVideoCapture cap(0);// check if we succeededif (!cap.isOpened()) {cerr << "ERROR! Unable to open camera\n";return -1;}// get one frame from camera to know frame size and typecap >> src;// check if we succeededif (src.empty()) {cerr << "ERROR! blank frame grabbed\n";return -1;}bool isColor = (src.type() == CV_8UC3);//--- INITIALIZE VIDEOWRITERVideoWriter writer;
    VideoWriter writerh264;int codec = CV_FOURCC('M', 'J', 'P', 'G');  // select desired codec (must be available at runtime)
    int codech264 = CV_FOURCC('H', '2', '6', '4');  // select desired codec (must be available at runtime)double fps = 25.0;                          // framerate of the created video streamstring filename = "./live.avi";             // name of the output video file
    string filenameh264 = "./live_h264.avi";             // name of the output video filewriter.open(filename, codec, fps, src.size(), isColor);
    writerh264.open(filenameh264, codech264, fps, src.size(), isColor);// check if we succeededif (!writer.isOpened()) {cerr << "Could not open the output video file for write\n";return -1;}if (!writerh264.isOpened()) {cerr << "Could not open the output video file for write\n";return -1;}//--- GRAB AND WRITE LOOPcout << "Writing videofile: " << filename << endl<< "Press any key to terminate" << endl;for (;;){// check if we succeededif (!cap.read(src)) {cerr << "ERROR! blank frame grabbed\n";break;}// encode the frame into the videofile streamwriter.write(src);
        writerh264.write(src);// show live and wait for a key with timeout long enough to show imagesimshow("Living", src);
        int key = cv::waitKey(1);if(key == 'q')break;}// the videofile will be closed and released automatically in VideoWriter destructorreturn 0;
}

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Opencv 打开笔记本摄像头

1.安装Opencv

1.1 编译

1.2 安装

2.打开摄像头

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