Opencv中将视频保存为连续的图片和连续的图片保存为视频

一直觉得Opencv是个很实用的很伟大的东西，很多功能总是能够在不经意间实现，下面就将AVI视频每一帧保存为图片（.jpg，.bmp），和连续图片保存为视频来演示一下：

   直接贴代码，只要学了Opencv一个星期的，绝对看的懂了：

#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 : %dntvideo width : %dntfps : %dntframe numbers : %dn", 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 : %dntvideo width : %dntfps : %dn", 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] = "1.avi";

Video_to_image(filename); //视频转图片

return 0;

}

文章摘自 http://blog.sina.com.cn/s/blog_6111ce890100q3i0.html