OpenCV从AVI视频提取图片

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使用OpenCV提取AVI里的视频（不限制avi格式，只要opencv支持的格式都行，同样来源也可以是摄像头），每隔几帧保存一张。

1.使用cvGrabFrame()+cvRetrieveFrame()

#include <iostream>#include <cv.h>#include <cxcore.h>#include <highgui.h>#pragma comment(lib, "ml.lib")#pragma comment(lib, "cv.lib")#pragma comment(lib, "cvaux.lib")#pragma comment(lib, "cvcam.lib")#pragma comment(lib, "cxcore.lib")#pragma comment(lib, "cxts.lib")#pragma comment(lib, "highgui.lib")#pragma comment(lib, "cvhaartraining.lib")int main(){ CvCapture *capture = NULL; IplImage *frame = NULL; char *AviFileName = "D:\\clock.avi";//视频的目录 char *AviSavePath = "D:\\截图\\";//图片保存的位置 const int jiange = 2;//间隔两帧保存一次图片 capture = cvCaptureFromAVI(AviFileName); cvNamedWindow("AVI player",1); int count_tmp = 0;//计数总帧数 char tmpfile[100]={'\0'}; while(true) {  if(cvGrabFrame(capture))  {   if (count_tmp % jiange == 0)   {    frame=cvRetrieveFrame(capture);    cvShowImage("AVI player",frame);//显示当前帧    sprintf(tmpfile,"%s//%d.jpg",AviSavePath,count_tmp);//使用帧号作为图片名    cvSaveImage(tmpfile,frame);   }       if(cvWaitKey(10)>=0) //延时    break;   ++count_tmp;  }  else  {   break;  } } cvReleaseCapture(&capture); cvDestroyWindow("AVI player");  std::cout<<"总帧数" << count_tmp << std::endl; return 0;}

2.使用 cvQueryFrame()

#include <iostream>#include <cv.h>#include <cxcore.h>#include <highgui.h>#pragma comment(lib, "ml.lib")#pragma comment(lib, "cv.lib")#pragma comment(lib, "cvaux.lib")#pragma comment(lib, "cvcam.lib")#pragma comment(lib, "cxcore.lib")#pragma comment(lib, "cxts.lib")#pragma comment(lib, "highgui.lib")#pragma comment(lib, "cvhaartraining.lib")int main(){ CvCapture *capture = NULL; IplImage *frame = NULL; char *AviFileName = "D:\\clock.avi"; char *AviSavePath = "D:\\截图2\\"; const int jiange = 2;//间隔两帧保存一次图片 capture = cvCaptureFromAVI(AviFileName); cvNamedWindow("AVI player",1); int count_tmp = 0;//计数 总帧数 char tmpfile[100] = {'\0'}; while( (frame = cvQueryFrame(capture)) != NULL) {  if (count_tmp % jiange == 0)  {   cvShowImage("AVI player", frame);//显示当前帧   sprintf(tmpfile,"%s//%d.jpg", AviSavePath, count_tmp);//使用帧号作为图片名   cvSaveImage(tmpfile, frame);  }      if(cvWaitKey(10)>=0) //延时  { break; }  ++count_tmp; } cvReleaseCapture(&capture); cvDestroyWindow("AVI player");  std::cout << "总帧数" << count_tmp << std::endl; return 0;}

参考资料：

OpenCV 获取摄像头，新建窗口显示摄像头视频

http://www.cnblogs.com/Anykong/archive/2011/04/09/Anykong_OpenCV2.html

AVI文件的读取并显示

http://blog.csdn.net/lelekyle/article/details/5679135

ps：本人在opencv 2.4.1 + vs2010，编译上述代码通过，但运行出错（同事的就不出错），环境配置是没问题的，估计是库的问题。

而使用opencv 2.4.1+ vc6.0完全正常。不知是神马问题。

           

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