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。