The opencv camera captures recognition colors

The example of this paper shares the specific code of opencv camera capturing and identifying colors for your reference. The specific content is as follows

#include "highgui.h"  
#include "iostream"
using namespace std;
 
int main() 
{ 
  CvCapture* pCap = cvCreateCameraCapture(1 );// Here, -1 B: That's ok, but my computer has it CyberLink YouCam Software,   
  int flag=0;                       //OpenCV The camera is called by default instead of the system driver   
 
 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); 
}