笔记本内置摄像头视频播放和存储

//#include<opencv2corecore.hpp>
//#include<opencv2highguihighgui.hpp>

#include <opencv2opencv.hpp>  
#include "iostream"  
using namespace cv;

//void filePlayVideo();
void videoReadWriter();
int main(){  
  //filePlayVideo();
  videoReadWriter();
  system("pause");
  return 0;
}

void playVideoFromCam()
{
  //从摄像头读入视频  
  VideoCapture capture(0);  //0笔记本内置摄像头，1调用usb摄像头
  while (1)  {    
    Mat frame;                //定义一个Mat变量，用于存储每一帧的图像    
    capture >> frame;            //读取当前帧        
    resize(frame, frame, Size(360, 240));  //改变图像大小    
    cvtColor(frame, frame, CV_BGR2GRAY);  //转为灰度图
    imshow("aa", frame);    
    waitKey(30);              //延时30ms  
  }  
}
void imageShow()
{
  Mat img = imread("Camera20200506134321196.jpg");
  namedWindow("游戏原画");
  resize(img, img, Size(360, 240));
  imshow("游戏原画", img);
  waitKey(6000);
}
void filePlayVideo()
{
  /***********************************方法1*************************************/
  VideoCapture capture;
  Mat frame;
  frame = capture.open("CAM2202002221459264482.wmv"); //capture.open()的参数为0时为读取摄像头：frame= capture.open(0);
  if (!capture.isOpened())
  {
    printf("can not open ...n");
  }
  namedWindow("output", CV_WINDOW_AUTOSIZE);

  while (capture.read(frame))
  {
    imshow("output", frame);
    waitKey(40);
  }
  capture.release();

}

//通过摄像头获取视频，然后通过capture.get(CV_CAP_PROP_FRAME_WIDTH), capture.get(CV_CAP_PROP_FRAME_HEIGHT)获取当前帧的宽度和高度，
//创建一个VideoWriter类对象writer进行视频的写入。
void videoWriter()
{
  VideoCapture capture;
  capture.open(0);
  if (!capture.isOpened())
  {
    printf("can not open ...n");
  }
  Size size = Size(capture.get(CV_CAP_PROP_FRAME_WIDTH), capture.get(CV_CAP_PROP_FRAME_HEIGHT));
  VideoWriter writer;
  writer.open("E:/image/a2.avi", CV_FOURCC('M', 'J', 'P', 'G'), 10, size, true);

  Mat frame, gray;
  namedWindow("output", CV_WINDOW_AUTOSIZE);

  while (capture.read(frame))
  {
    //转换为黑白图像
    cvtColor(frame, gray, COLOR_BGR2GRAY);
    //二值化处理 
    threshold(gray, gray, 0, 255, THRESH_BINARY | THRESH_OTSU);
    cvtColor(gray, gray, COLOR_GRAY2BGR);
    imshow("output", gray);
    writer.write(gray);
    waitKey(10);
  }
  waitKey(0);
  capture.release();
}

//從視頻讀取視頻后再寫入指定的文件
void videoReadWriter()
{
  VideoCapture capture;
  Mat frame, gray;
  frame = capture.open("CAM2202002221459264482.wmv"); //capture.open()的参数为0时为读取摄像头：frame= capture.open(0);
  if (!capture.isOpened())
  {
    printf("can not open ...n");
  }
  namedWindow("output", CV_WINDOW_AUTOSIZE);

  Size size = Size(capture.get(CV_CAP_PROP_FRAME_WIDTH), capture.get(CV_CAP_PROP_FRAME_HEIGHT));
  VideoWriter writer;
  writer.open("a1.avi", CV_FOURCC('M', 'J', 'P', 'G'), 25, size, true);

  while (capture.read(frame))
  {
    //转换为黑白图像
    cvtColor(frame, gray, COLOR_BGR2GRAY);
    //二值化处理 
    threshold(gray, gray, 0, 255, THRESH_BINARY | THRESH_OTSU);
    cvtColor(gray, gray, COLOR_GRAY2BGR);
    imshow("output", gray);
    writer.write(gray);
    waitKey(40);
  }
  capture.release();
}