opencv视频转图片并保存到文件夹下

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实验时经常需要将视频保存为一帧一帧的图片，以获取实验结果，附代码如下：

#include <iostream>  #include <vector>  #include "opencv2\highgui\highgui.hpp"    using namespace std;  using namespace cv;    void video2image(string video,string path)  {      VideoCapture capture(video); long totalFrameNumber = capture.get(CV_CAP_PROP_FRAME_COUNT);      cout << "total frames is:" << totalFrameNumber << "." << endl;//设置开始帧      long frameToStart = 1;      capture.set(CV_CAP_PROP_POS_FRAMES, frameToStart);      cout << "from" <<frameToStart << "read" << endl;        //设置结束帧      int frameToStop = 10;         //获取帧率      double rate = capture.get(CV_CAP_PROP_FPS);      cout << "rate is:" << rate<< endl;  double delay = 1000 / rate;     //定义一个用来控制读取视频循环结束的变量      bool stop = false;  long currentFrame = frameToStart;      if(!capture.isOpened())      {          cerr<<"Failed to open a video"<<endl;          return ;      }        Mat frame;      int num=1;      string filename;      char   temp_file[15];        while (!stop)       {          capture>>frame;          if(frame.empty())              break;          _itoa_s(num,temp_file,4,10); //4表示字符长度,10表示十进制,_itoa_s实现整型转字符串          filename = temp_file;          filename = path+filename+".jpg";    cout << "now is reading" << currentFrame << "." << endl;          imshow("Extractedframe",frame);                   cout << "now is writing" << currentFrame << "." << endl;           imwrite(filename,frame);   int c = waitKey(delay);          //按下ESC或者到达指定的结束帧后退出读取视频          if ((char)c == 27 ||currentFrame > frameToStop)          {              stop = true;          }          //按下按键后会停留在当前帧，等待下一次按键          if (c >= 0)          {              waitKey(0);          }  num++;  currentFrame++;    }      capture.release();  waitKey(0);  }    int main(int argc,char** argv)  {      string videoFromfile = "E:\\face.mp4";  //读取视频      string Imagespath    = "E:\\video2Image\\";    // 保存图片的文件夹路径一定要有，因为OpenCV不会自动创建文件夹      video2image(videoFromfile,Imagespath);        return 0;  }

运行结果：

参考：

http://blog.csdn.net/zhonghuan1992/article/details/38469315

http://www.cnblogs.com/yingying0907/archive/2012/08/11/2633426.html

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