find and save the coordinates

edit

The idea draw the line and find the point of intersection. I want to ask the first line to find the coordinates (x, y) and store them in a variable. then indented 5 pixel coordinates check again if the coordinates on the Y axis are the same check again until the Y is not greater than the initial stuns Y. save the coordinates, and then find the coordinates 50 and 200 pixels. then find the point where the Y coordinate again become equal to the initial value again and save it as a variable. the screen must be vyvezheny 1) the coordinates of the first line, 2) where Y is greater than nachalngoy 3-4) coordinates 50 and 200 pixels and 5) when Y again becomes equal to the original. 5 different points

I have the following code:

int main(int argc, char** argv)
{
 Mat src,cdst;
src = imread("2.jpg");
 if(src.empty())
 {return -1;}
    cvtColor(src, cdst, CV_BGR2GRAY); 

    vector<Rect> rects_of_lines;
    Rect rect_of_line;
    rect_of_line.x = 1;
    rect_of_line.y = 0;
    rect_of_line.width = 1;
    rect_of_line.height = src.rows;

    rects_of_lines.push_back( rect_of_line );
    rectangle( src, rect_of_line, Scalar(0,0,255));

    vector<vector<Point> > contours;
    findContours(cdst.clone(), contours, CV_RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE);
    Rect _boundingRect;

    for (size_t i = 0; i < contours.size(); ++i)
    {
    if( contourArea( contours[i] ) > 20 )
    {
        _boundingRect = boundingRect( Mat(contours[i]) );

        for( int j = 0; j < rects_of_lines.size(); j++ )
            {
            Rect intersection = _boundingRect & rects_of_lines[j];
            if(intersection.height > 0)
            {
                intersection.x = intersection.x + (intersection.width / 2 );
                intersection.y = intersection.y + (intersection.height / 2 );
                intersection.width = 1;
                intersection.height = 1;
            rectangle( src, intersection, Scalar(255,0,0),10);
            putText(src, format("x = %d , y = %d",intersection.x,intersection.y),Point(intersection.x,intersection.y),CV_FONT_HERSHEY_COMPLEX,0.5,Scalar(255,255,255));
                                                        } } } }
    imshow("1", src);
  waitKey();
 return 0;
}

and folowing pictures

I have : http://www.pictureshack.ru/images/946... i need : http://www.pictureshack.ru/images/400...