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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] [-verbose] [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 symmetric transparent object.  The image must have a ver‐
       tical 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*fac‐
       tor  multiplied	by the size of one pixel (pixsize).  With the -verbose
       option, pgmabel prints the weighting factors.

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

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

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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