USAGE: papertape -l[ine] <source> <ulx>/<uly>/<lrx>/<lry> [<key> <value> ..]
USAGE: papertape -s[ave] <source> <imagefilename> [<key> <value> ..]
USAGE: papertape -t[racking] <source> <xl>/<xr> <ytop>/<yprint>/<ybot>
                 <xscan>/<yscan> <ulx>/<lrx> [<key> <value> ..]
Note: xl<=xr and imageheight>ybot>yprint>ytop>0 are obligatory.
      Preprocess images with jpegtran as required.
PROCEDURE:
Load image. Terminate on failure.
Create binary image (<R> > <rlevel> && <G> > <glevel> && <B> > <blevel>).
Erode or dilate binary image.
Option -l[ine]:
examines <n> pixels on the line (<ulx>,<uly>) (<lrx>,<lry>).
writes <n> digits 0, 1 or 8 if the point is situated outside the image
followed by <source>number to <dest>. By default when the array is changed.
Option -s[ave]:
Save preprocessed image as <dest> and terminate.
Option -t[racking]:
Write number of changes in columns of rectangle (<ulx>,<ytop>)/(<lrx>,<ybot>)
to <dest> as <n> numbers.
Count pixel differences between current image and previous image shifted
by effectively dx=-<xscan> ... +<xscan> and dy=1 ... <yscan>
in shifted rectangle (<xl>,<ytop>)/(<xr>,<ybot>).
Sort the resulting array to find the best fit.
This gives a upper value for ymatch.
Use the protocol for option -l to print pixel values for "new" y values
with line <ulx>/y/<lrx>/y.

   Upperleft=(0,0). All <source>s should have the same size.
   Image       n-1          n
       y=0   |     |     |     | y=0    
             |     |     |     |        
             |     |     |     |        
             |     |     | --- | ytop-yscan
             |     |     |     |        
             |     |     | top |         ^
             |     |   / |     |         | papertape movement
      ytop   | top | /   |done | ymatch  |
             |     |   / |print|        
      yprint |done | /   |print| yprint 
             |     |     |     |        
             |     |     | bot |        
             |     |   / |     |        
      ybot   | bot | /   | --- | ybot   
             |     |     |     |        
           xl+dx xr+dx   xl    xr       

All options: terminate or enter next cycle.

<source> may be a single imagefile (for -l,-s) of contain "%[0][<width>]d".

 KEY       VALUE                      DESCRIPTION AND DEFAULTS
 -e[osion] [-]<iterations>            erode [dilate] binary image. Default: 1
 -f[irst]  <picturenumber>            Default: 0
 -l[evel]  <rlevel>/<glevel>/<blevel> Default: 100.50/100.5/100.5
 -m[ax]    <index>                    last file to read. Default: all.
 -n[point] <n>                        at least 2. Default: 65
 -n[point] 0                          set <n> to <lrx>-<ulx>+1.
 -N[point] 0|<n>                      idem, but write every line.
 -w[riteto] <file>                    write to <file> Default: stdout.
 KEY for option -t[racking] omly:
 -c[hanges] y[es]|n[o]                write number of changes in columns
                                      of rectangle. Default: yes
 -d[ebug]   <lines>                   write first <lines> of sorted array
                                      delta[].count to <dest>.
 -d[ebug]   -1                        write offsets d(x,y).
 -y[value]  y[es]|n[o]                write y-value to <dest>. Default: no
Return values: 0 Ok, 1 too few args, 2 syntax-, 3 file-, 4 runtime-error.
USING: OpenCV version 1.1.0 (1.1.0)
VERSION: Jun 24 2014

Copyright (C) 2014 by Harm J. Schoonhoven

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