pgmabel - create cross section using Abel Integration for Deconvolution

       Volker Schmidt (lefti@voyager.boerde.de)

       Copyright (C) 1997-2002 German Aerospace research establishment

       This program is part of Netpbm(1).

       pgmabel reads as input a PGM image, which it assumes to be an image of a rotational symmetric transparent
       object.   The  image must have a vertical symmetry axis.  pgmabel produces as output an image of a cross-
       section of the image.

       pgmabel does the calculation by performing the Abel Integration for Deconvolution of an axial-symmetrical
       image by solving the system of linear equations.

       After integration, pgmabel weights all gray-values of one side by the surface area of the calculated ring
       in square pixels divided by 4*factor multiplied by the size of one pixel (pixsize).   With  the  -verbose
       option, pgmabel prints the weighting factors.

       Where the calculation generates a negative result, the output is black.

       The computation is unstable against periodic structures with size 2 in the vertical direction.

       This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The  master  documentation
       is at

              http://netpbm.sourceforge.net/doc/pgmabel.html

netpbm documentation                                June 2002                             PgmabelUserManual(1)

       Rotate a PGM image to get an image with a vertical axis of symmetry, then calculate the cross section:

           pnmrotate 90 file.pgm | pgmabel -axis 140 >cross_section.pgm

       This program was added to Netpbm in Release 10.3 (June 2002).

       pgmabel - create cross section using Abel Integration for Deconvolution

       In  addition  to  the options common to all programs based on libnetpbm (most notably -quiet, see  Common
       Options ), pgmabel recognizes the following command line options:

       You can abbreviate any option to its shortest unique prefix.

       -help  Prints a help message.

       -axisaxis
              Position of the axis of symmetry in the image in pixels from the left edge of the image.   Default
              is the center of the image.

       -factorfactor
              User  defined  factor for enhancement of the output.  Use a factor less than 1 for decreasing gary
              values.  Default is 1.0.

       -pixsizepixsize
              The size of a pixel for getting scale invariant.  Default is 0.1.

       -left  Calculate only the left side of the image.  You cannot specify both left and right.

       -right Analogous to -left.

       -verbose
              print information about the calculation.

pnmrotate(1), pgm(1),

pgmabel [-help] [-axisaxis] [-factorfactor] [-pixsizepixsize] [-left | -right] [-verbose] [filespec]