PostScript file for viewing with evince.  Common
   image display programs are: xzgv, xli, xv, display, gthumb, gqview,
   evince, gv and acroread.

12. Document image analysis

   Many functions have been included specifically to help with
   document image analysis.  These include skew and text orientation
   detection; page segmentation; baseline finding for text;
   unsupervised classification of connected components, characters
   and words; dewarping camera images; adaptive binarization; and
   a simp