OpenCV保存视频图片相关

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环境： ubuntu1404, openCV2.4.13

1.从usb camera在线读取显示图片并保存视频和图片：

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

using namespace cv;
Mat frame;
int num=0;
char imagename[100];

int main(int argc, char** argv)
{
 VideoCapture capture( argc == 2 ? argv[1][0] - '0' : 0 );
 VideoWriter writer("VideoSave.avi", CV_FOURCC('M', 'J', 'P', 'G'), 25.0, Size(640, 480));

 while (capture.isOpened())
 {
  if(num%100==0){ 
  capture >> frame;
  sprintf(imagename,"$Path/%d%s",num/100,".jpg");
  writer.write(frame);
  imwrite(imagename, frame);
  imshow("video", frame);
  if(waitKey(30) >=10)  break;  }
  num++;
  }
 }

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2.将视频帧转成图片输出

#include <iostream>
#include "cv.h"
#include "opencv2/opencv.hpp"

using namespace std;
using namespace cv;

int main()
{
        VideoCapture cap("VideoSave.avi");
        long totalFrameNumber = cap.get(CV_CAP_PROP_FRAME_COUNT);
        cout << "total frames: " << totalFrameNumber << endl;
        Mat frame;
        bool flags = true;
        long currentFrame = 0;

        while (flags){
                cap.read(frame);
                stringstream str;
                str << "pic" << currentFrame << ".jpg";
                if (currentFrame % 30 == 0){
                         imwrite("data/" + str.str(), frame);
                }
                if (currentFrame >= totalFrameNumber){
                        flags = false;}
                currentFrame++;
        }
}

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3.ros 方式保存视频：

rosrun image_view video_recorder image:=/usb_cam/image_raw  _max_depth_range:="0"