.ds Vi Vista
.ds Vn 2.0
.TH vtopoclass 1Vi "15 Februar 1994" "\*(Vi Version \*(Vn"
.SH NAME
vtopoclass \- perform a topological classification
.SH SYNOPSIS
\fBvtopoclass\fR [\fB-\fIoption\fR ...] \
[\fIinfile\fR] [\fIoutfile\fR]
.SH DESCRIPTION
\fBvtopoclass\fP
performs a topological classification on a binary input image and
produce a labelled output image.
.LP
Typically, this program is applied to a skeletonized binary image.
It will attribute a label to each foreground voxel, which characterizes
its topological type. 
.LP
The input image must be of type bit. The output 
image will be of type ubyte.
.LP
Output codes are the following:
.LP
.RS 
    1:  interior point 
    2:  isolated point
    3:  border point
    4:  curve point
    5:  curves junction
    6:  surface point
    7:  surface/curve junction
    8:  surfaces junction
    9:  surfaces/curve junction
.RE
.LP
.SH LIT:
.na
.nh
G. Malandain, G. Bertrand, N. Ayache:
"Topological Segmentation of discrete surfaces",
Intern. Journal of Computer Vision, 10:2, pp. 183-197, 1993

.SH COMMAND LINE OPTIONS
\fBvtopoclass\fP accepts the following options:
.IP \fB-help\fP 15n
Prints a message describing options.
.IP "\fB-in\fP \fIinfile\fP"
Specifies the Vista data file containing the input images.
.IP "\fB-out\fP \fIoutfile\fP"
Specifies where to write the output images as a Vista data file.
.LP
Input and output files can be specified on the command line or allowed to
default to the standard input and output streams.
.SH "SEE ALSO"
.na
.nh
.BR vthin3d (1Vi),
.BR VImage (3Vi),
.BR Vista (7Vi)
.hy
.ad
.SH AUTHOR
Gabriele Lohmann <lohmann@cns.mpg.de>