我用的是opencv1+vc6.0
#include "StdAfx.h"
#include "stdio.h"
#include"string.h"
#include"cv.h"
#include"highgui.h"
int main(int argc, char* argv[])
{
CvCapture *camera=0;
IplImage *frame=0;
int i,n=0;
char filename[256];
char c;
camera=cvCaptureFromCAM(CV_CAP_ANY);
if(!camera)
{
fprintf(stderr,"Can't initialize camera\n");
return -1;
}
cvNamedWindow("video",CV_WINDOW_AUTOSIZE);
cvMoveWindow("video",150,200);
for(i=0;i<600;i++)
{
frame=cvQueryFrame(camera);
if(!frame)
{
fprintf(stderr,"Capture failed.\n");
}
c=cvWaitKey(100);
cvShowImage("video",frame);
if(c>0)
{
sprintf(filename,"F:/image/videoframe%d.jpg",n++);
if(!cvSaveImage(filename,frame))
{
fprintf(stderr,"failed to save frame as '%s'\n",filename);
}else
fprintf(stderr,"Saved frame as 'videoframe%d.jpg'/n",n-1);
}
}
cvReleaseCapture(&camera);
cvWaitKey(0);
return 0;
}

换个高的版本

你用这个试试
cvNamedWindow("video",CV_WINDOW_AUTOSIZE);
CvCapture* capture = NULL;
capture=cvCreateCameraCapture(0);
IplImage*frame;
while(1){
frame=cvQueryFrame(capture);
if(!frame)break;
cvShowImage("video",frame);
char c=cvWaitKey(33);
if(c==27)break;
}
cvReleaseCapture(&capture);

camera=cvCaptureFromCAM(CV_CAP_ANY);用-1或者0或者1挨个试一试，有时候会出问题，比如你摄像头换过口，就会出问题，我曾经用两个摄像头做测试，然后拔掉一个之后另外那个的序号不变，用-1识别不出来。

我用USB摄像头也是这个问题，改成-1能打开但就是显示灰色，后来就改成0忽然就可以了，难道电脑没摄像头将外接的USB摄像头默认为内部的