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how can I find the coordinates with the given step?

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I have the following picture from camera: http://www.pictureshack.ru/images/10081_3.jpg I need: http://www.pictureshack.ru/images/643_2.jpg I tried first to find the lines with HoughLines , but results were not good races : http://www.pictureshack.ru/done_66361_4.jpg then, I considered myself as I can see the laser line . I've tried using Canny , there are too many other unnecessary lines . After that I read on the internet about HSV . as firstly I made trackable: int iLowH = 0; int iHighH = 255; int iLowS = 0; int iHighS = 255; int iLowV = 0; int iHighV = 255; //Create trackbars cvCreateTrackbar("LowH", "Control", &iLowH, 255); cvCreateTrackbar("HighH", "Control", &iHighH, 255); cvCreateTrackbar("LowS", "Control", &iLowS, 255); cvCreateTrackbar("HighS", "Control", &iHighS, 255); cvCreateTrackbar("LowV", "Control", &iLowV, 255); cvCreateTrackbar("HighV", "Control", &iHighV, 255); as the next I have with findcountors that Countor have found: vector> contours; vector contour; findContours( imgThresholded, contours, CV_RETR_TREE, CV_CHAIN_APPROX_NONE ); //findContours( edges, contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE ); for ( size_t i = 0; i < contours.size(); i++) {drawContours(imgOriginal,contours,i,color);} und I have : http://www.pictureshack.ru/images/75086_2.jpg How do I find the coordinates at the intersection of the lines drawn by me and " lines " in the picture?

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