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\
.\" This man page was generated by the Netpbm tool 'makeman' from HTML source.
.\" Do not hand-hack it! If you have bug fixes or improvements, please find
.\" the corresponding HTML page on the Netpbm website, generate a patch
.\" against that, and send it to the Netpbm maintainer.
.TH "Pgmabel User Manual" 0 "June 2002" "netpbm documentation"
.UN lbAB
.SH NAME
pgmabel - create cross section using Abel Integration for Deconvolution
.UN lbAC
.SH SYNOPSIS
\fBpgmabel\fP
[\fB-help\fP]
[\fB-axis\fP \fIaxis\fP]
[\fB-factor\fP \fIfactor\fP]
[\fB-pixsize\fP \fIpixsize\fP]
[\fB-left\fP | \fB-right\fP]
[\fB-verbose\fP]
[\fIfilespec\fP]
.UN lbAD
.SH DESCRIPTION
.PP
This program is part of
.BR "Netpbm" (1)\c
\&.
.PP
\fBpgmabel\fP 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. \fBpgmabel\fP produces as output an image of
a cross-section of the image.
\fBpgmabel\fP does the calculation by performing the Abel Integration
for Deconvolution of an axial-symmetrical image by solving the system
of linear equations.
After integration, \fBpgmabel\fP weights all gray-values of one side
by the surface area of the calculated ring in square pixels divided by
4*\fIfactor\fP multiplied by the size of one pixel (\fIpixsize\fP).
With the \fB-verbose\fP option, \fBpgmabel\fP prints the weighting
factors.
.PP
Where the calculation generates a negative result, the output is black.
.PP
The computation is unstable against periodic structures with size 2 in
the vertical direction.
.UN lbAE
.SH OPTIONS
.PP
You can abbreviate any option to its shortest unique prefix.
.TP
\fB-help\fP
Prints a help message.
.TP
\fB-axis\fP \fIaxis\fP
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.
.TP
\fB-factor\fP \fIfactor\fP
User defined factor for enhancement of the output. Use a \fIfactor\fP
less than 1 for decreasing gary values. Default is 1.0.
.TP
\fB-pixsize\fP \fIpixsize\fP
The size of a pixel for getting scale invariant. Default is 0.1.
.TP
\fB-left\fP
Calculate only the left side of the image. You cannot specify both
\fBleft\fP and \fBright\fP.
.TP
\fB-right\fP
Analogous to \fB-left\fP.
.TP
\fB-verbose\fP
print information about the calculation.
.UN example
.SH EXAMPLE
.PP
Rotate a PGM image to get an image with a vertical axis of symmetry,
then calculate the cross section:
.nf
pnmrotate 90 file.pgm | pgmabel -axis 140 >cross_section.pgm
.fi
.UN lbAF
.SH SEE ALSO
.BR "pnmrotate" (1)\c
\&,
.BR "pgm" (5)\c
\&,
.UN history
.SH HISTORY
.PP
This program was added to Netpbm in Release 10.3 (June 2002).
.UN author
.SH AUTHOR
.PP
Volker Schmidt (lefti@voyager.boerde.de)
.PP
Copyright (C) 1997-2002 German Aerospace research establishment
.SH DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML
source. The master documentation is at
.IP
.B http://netpbm.sourceforge.net/doc/pgmabel.html
.PP
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