读取视频中的每一帧并保存图片

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