title: How to connect OpenCV contours horizontally?
body: <p>I'm using findContours in Opencv 2.9 (C++). What I obtain is a vector> contours, which describes my contours. Lets say I've got a rectangle with its contour stored in the vector. What I would like to do next is, to connect the left and right side of the contour at any point with a line. E.g. 10 pixels below the upper left corner to the 10 pixels below upper right corner of the rectangle. The line should end where the contour does. Is there a better approach then just going scanline wise through that lane and checking every pixel if <code>pointPolygonTest</code> is true?</p>
  
  <p>Thanks in advance!</p>