#include "highgui.h"  #include "iostream"using namespace std; int main() {   CvCapture* pCap = cvCreateCameraCapture(1 );//這里-1也可以，不過我的電腦裝的有CyberLink YouCam軟件，    int flag=0;                       //OpenCV會默認調用該攝像頭，而不調用系統的驅動    IplImage* frame =NULL;   if (cvCreateCameraCapture == NULL)   {     return(0);   }    cvNamedWindow("Camera",CV_WINDOW_FULLSCREEN);    while ((frame = cvQueryFrame(pCap)) != 0 && cvWaitKey(20) != 27)    {     frame = cvQueryFrame(pCap); //cout<<frame->width<<" "<<frame->height<<endl; flag=0; for(int x=0;x<frame->height;x++) { for(int y=0;y<frame->width*3;y++) { //CV_IMAGE_ELEM(frame,uchar,x,y)=255;  if( ((uchar*)(frame->imageData+x*frame->widthStep))[y*frame->nChannels+0]<30 //b  &&((uchar*)(frame->imageData + x*frame->widthStep))[y*frame->nChannels + 1]<30 //g  &&((uchar*)(frame->imageData + x*frame->widthStep))[y*frame->nChannels + 2]>150) //r    flag++;   } } cout<<flag<<endl; if(flag>70000) cout<<"red";  else  cvShowImage("Camera",frame);   }    aaa: cvReleaseCapture(&pCap);    cvDestroyWindow("Camera"); system("pause");  return (0); }