Pgmabel User Manual(0) Pgmabel User Manual(0)
pgmabel - create cross section using Abel Integration for Deconvolution
pgmabel [-help] [-axis axis] [-factor factor] [-pixsize pixsize] [-left
| -right] [-verbose] [filespec]
You can abbreviate any option to its shortest unique prefix.
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
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.
-help Prints a help message.
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.
User defined factor for enhancement of the output. Use a factor
less than 1 for decreasing gary values. Default is 1.0.
The size of a pixel for getting scale invariant. Default is
-left Calculate only the left side of the image. You cannot specify
both left and right.
-right Analogous to -left.
print information about the calculation.
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).
Volker Schmidt (firstname.lastname@example.org)
Copyright (C) 1997-2002 German Aerospace research establishment
netpbm documentation June 2002 Pgmabel User Manual(0)
Man(1) output converted with