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Pgmabel User Manual(0)							   Pgmabel User Manual(0)

NAME
       pgmabel - create cross section using Abel Integration for Deconvolution

SYNOPSIS
       pgmabel	[-help]  [-axis axis] [-factor factor] [-pixsize pixsize] [-left | -right] [-ver-
       bose] [filespec]

DESCRIPTION
       This program is part of Netpbm(1)

       pgmabel reads as input a PGM image, which it assumes to be an image of a  rotational  sym-
       metric  transparent  object.   The image must have a vertical symmetry axis.  pgmabel pro-
       duces 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 direc-
       tion.

OPTIONS
       You can abbreviate any option to its shortest unique prefix.

       -help  Prints a help message.

       -axis axis
	      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.

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

       -pixsize pixsize
	      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.

EXAMPLE
       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

SEE ALSO
       pnmrotate(1) , pgm(1) ,

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

AUTHOR
       Volker Schmidt (lefti@voyager.boerde.de)

       Copyright (C) 1997-2002 German Aerospace research establishment

netpbm documentation			    June 2002			   Pgmabel User Manual(0)
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