opencv读取图片并做成视频

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本文介绍如何利用OpenCV库在C++中创建并读取视频文件。首先通过交替复制两幅图像来生成一个视频文件，接着展示了如何打开这个视频文件并逐帧进行读取和显示。

#include <cv.h>

#include <highgui.h>

#include <stdio.h>

int main()

    IplImage *img=cvLoadImage("E://qt//intel_cup//SURF_H//A1.jpg",0);

    IplImage *img1=cvLoadImage("E://qt//intel_cup//SURF_H//A2.jpg",0);

    IplImage *temp=cvCreateImage(cvGetSize(img),IPL_DEPTH_8U,1);

    CvVideoWriter * pwriter;

    pwriter=cvCreateVideoWriter("my.avi",0 ,20,cvGetSize(img),1);

   // printf("%x\n",pwriter);

    int num=100;

    while(num>0)

        if(num%2==0)

            cvCopy(img,temp);

        else

            cvCopy(img1,temp);

        int result=cvWriteFrame(pwriter,temp);

        num--;

    cvReleaseVideoWriter(&pwriter);

    cvReleaseImage(&img);

    //=======================================================

    CvCapture * capture = cvCreateFileCapture ("my.avi");  //读取视频

    if(capture==NULL)

        printf("NO capture");    //读取不成功，则标识

        return 1;

};

/*

    double fps=cvGetCaptureProperty(capture, CV_CAP_PROP_FPS );   //读取视频的帧率

    int vfps = 1000 / fps;                                        //计算每帧播放的时间

    printf("%5.1f\t%5d\n",fps,vfps);

    double frames=cvGetCaptureProperty(capture,CV_CAP_PROP_FRAME_COUNT);//读取视频中有多少帧

    printf("frames is %f\n",frames);

    cvNamedWindow("example",CV_WINDOW_AUTOSIZE);                  //定义窗口

    IplImage * frame;

    while(1)

        frame = cvQueryFrame( capture );

        if(!frame)

            break;

        float ratio = cvGetCaptureProperty(capture, CV_CAP_PROP_POS_AVI_RATIO);     //读取该帧在视频中的相对位置

        printf("%f\n",ratio);

        cvShowImage("example",frame);                          //显示

        char c = cvWaitKey(vfps);

        if(c == 27 )break;

    cvReleaseCapture(&capture);

    cvDestroyWindow("example");

    return 0;