I am now trying to put together some code to vectorize scanned maps.   
   There is basically one issue that puzzles me, line detection.   
   I have read numerous http articles on filter-based detectors, but they   
   all seem to say YES/NO to a question, if there is a line. I need   
   (x,y)-(x,y) response. Other articles deal with photoimages; they are   
   focused on finding at least some lines anywhere. In my case I think I   
   have to use an information I have as to what lines look like, while   
   those mentioned approaches do not use such an information (primarily   
   because they don't have it). So, after days, I feel like in empty   
   dark room. Would someone please turn lights on for me?   
      
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