图像处理---视频<->图片

// 该程序实现视频和图片的相互转换.
// Image_to_video()函数将一组图片合成AVI视频文件.
// Video_to_image()函数将AVI视频文件读入，将每一帧存储为jpg文件.
//
////////////////////////////////////////////////////////////////////////
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <cv.h>
#include <highgui.h>
#define NUM_FRAME 300 //只处理前300帧，根据视频帧数可修改

void Video_to_image(char* filename)
{
    printf("------------- video to image ... ----------------\n");
    //初始化一个视频文件捕捉器
    CvCapture* capture = cvCaptureFromAVI(filename);
    //获取视频信息
    cvQueryFrame(capture);
    int frameH = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT);
    int frameW = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH);
    int fps = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FPS);
    int numFrames = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_COUNT);
    printf("\tvideo height : %d\n\tvideo width : %d\n\tfps : %d\n\tframe numbers : %d\n", frameH, frameW, fps, numFrames);
    //定义和初始化变量
    int i = 0;
    IplImage* img = 0;
    char image_name[13];

    cvNamedWindow( "mainWin", CV_WINDOW_AUTOSIZE );
    //读取和显示
    while(1)
    {

        img = cvQueryFrame(capture); //获取一帧图片
        cvShowImage( "mainWin", img ); //将其显示
        char key = cvWaitKey(20);

        sprintf(image_name, "%s%d%s", "image", ++i, ".jpg");//保存的图片名

        cvSaveImage( image_name, img); //保存一帧图片 

        if(i == NUM_FRAME) break;
    }
    cvReleaseCapture(&capture);
    cvDestroyWindow("mainWin");
}
void Image_to_video()
{
    int i = 0;
    IplImage* img = 0;
    char image_name[13];
    printf("------------- image to video ... ----------------\n");
    //初始化视频编写器，参数根据实际视频文件修改
    CvVideoWriter *writer = 0;
    int isColor = 1;
    int fps = 30; // or 25
    int frameW = 400; // 744 for firewire cameras
    int frameH = 240; // 480 for firewire cameras
    writer=cvCreateVideoWriter("out.avi",CV_FOURCC(‘X‘,‘V‘,‘I‘,‘D‘),fps,cvSize(frameW,frameH),isColor);
    printf("\tvideo height : %d\n\tvideo width : %d\n\tfps : %d\n", frameH, frameW, fps);
    //创建窗口
    cvNamedWindow( "mainWin", CV_WINDOW_AUTOSIZE );
    while(i<NUM_FRAME)
    {
        sprintf(image_name, "%s%d%s", "image", ++i, ".jpg");
        img = cvLoadImage(image_name);
        if(!img)
        {
            printf("Could not load image file...\n");
            exit(0);
        }
        cvShowImage("mainWin", img);
        char key = cvWaitKey(20);
        cvWriteFrame(writer, img);
    }
    cvReleaseVideoWriter(&writer);
    cvDestroyWindow("mainWin");
}

int main(int argc, char *argv[])
{
    char filename[13] = "infile.avi";
    Video_to_image(filename); //视频转图片
    Image_to_video(); //图片转视频
    return 0;
}
//--------------------------------------------------------------------------------