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I want to detect car from a moving vehicle by finding the rear light. I have extracted red color and using findContour detected them too, now how do I pair the lights? Is it by thresholding the distance between the red contours detected? Can anyone suggest the method for this thresholding?

I want to detect car from a moving vehicle by finding the rear light. I have extracted red color and using findContour detected them too, now how do I pair the lights? Is it by thresholding the distance between the red contours detected? Can anyone suggest the method for this thresholding?

    }
}
           for( int i = 0; i< boundRect.size()-1; i++ )
{
              if((boundRect[i+1].y==boundRect[i].y-1)||(boundRect[i+1].y==boundRect[i].y)||(boundRect[i+1].y==boundRect[i].y+1))//(3.0<=aspect_ratio || (
    {
    rectangle( src1, boundRect[i+1].tl(), boundRect[i].br(), Scalar(255,0,0), 2, 8, 0 ); 
    imshow( "Contours1", src1 );
    }
}

imshow( "Contours", src1 );

I want to detect car from a moving vehicle by finding the rear light. I have extracted red color and using findContour detected them too, now how do I pair the lights? Is it by thresholding the distance between the red contours detected? Can anyone suggest the method for this thresholding?

My code is as follows: follows:

            Mat src=imread("773.jpg");
 Mat roi=src(Rect(5,400,1350,400));(same width but half the height)
 Mat src1=roi.clone();
 cvtColor(roi,roi,CV_BGR2HSV);
 cv::Scalar   min(129, 150, 10);//min(220/2, 0, 0); Hue=140-179(red),
 cv::Scalar   max(179,255, 255);//max(260/2,255, 255);
 Mat dst;
 inRange(roi,min,max,dst);
 imshow("roi",dst);
 Mat gray_roi;
 cvtColor(roi,gray_roi,CV_BGR2GRAY);
 bitwise_and(gray_roi,dst,gray_roi);
 imshow("gray",gray_roi);
 dilate(gray_roi, gray_roi, getStructuringElement(MORPH_ELLIPSE, Size(5, 5)) );
 imshow("gray_dilate",gray_roi);
    vector<vector<point> vector<vector<Point> > contours;
    vector<vec4i> vector<Vec4i> hierarchy;
 /// Find contours
 findContours( gray_roi, contours, hierarchy, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );
    vector<rect> vector<Rect> boundRect( contours.size() );
             for( int i = 0; i< contours.size(); i++ )
 {
     boundRect[i] = boundingRect( Mat(contours[i]) );
     area=boundRect[i].width*boundRect[i].height;
                             if(area>40)//(3.0<=aspect_ratio || (
     {
     count++;
     rectangle( src1, boundRect[i].tl(), boundRect[i].br(), Scalar(255,0,0), 2, 8, 0 ); 
     imshow( "Contours1", src1 );
     waitKey(0);
     std::cout<<"index values"<<boundrect[i].x&lt;&lt;" "&lt;<boundrect[i].y;="" index.push_back(i);<="" p="">

values"<<boundRect[i].x<<"  "<<boundRect[i].y;
    index.push_back(i);

    }
}
           for( int i = 0; i< boundRect.size()-1; i++ )
{
              if((boundRect[i+1].y==boundRect[i].y-1)||(boundRect[i+1].y==boundRect[i].y)||(boundRect[i+1].y==boundRect[i].y+1))//(3.0<=aspect_ratio || (
    {
    rectangle( src1, boundRect[i+1].tl(), boundRect[i].br(), Scalar(255,0,0), 2, 8, 0 ); 
    imshow( "Contours1", src1 );
    }
}

imshow( "Contours", src1 );
 
Kindly tell me how to pair the contours for rear lights and detect vehicle.