.\"
.\" gen_cox_sig.1 - the *roff document processor man page source
.\"
.TH gen_cox_sig 1 "98/06/30" "Watermarking, Version 1.0"
.SH NAME
.B gen_cox_sig 
\- a program to generate a signature for
the 
.B wm_cox_e 
watermarking program
.SH SYNOPSIS
.B gen_cox_sig
[
.BI \-a \ number
]
[
.BI \-d \ number
]
[
.B \-h
]
[
.BI \-m \ number
]
[
.BI \-n \ number
]
[
.BI \-o \ file
]
[
.BI \-q \ number
]
[
.BI \-s \ number
]
.SH DESCRIPTION
.B gen_cox_sig
is a program to generate a signature to be
embedded with the 
.B wm_cox_e 
watermarking program and extracted with the 
.B wm_cox_d 
program. The
.B cmp_cox_sig 
program is used to compare and test an
extracted signature with the original signature.
.PP
Please refer to Ingemar J. Cox's paper "Secure Spread Spectrum
Watermarking for Multimedia", 1995, to get an idea about the algorithm.
.PP
.SH OPTIONS
.TP
.BI \-a \ number
Alpha factor that determines embedding strength of the signature. Default
value 0.3.
.TP
.BI \-d \ number
Deviation for the normal distributed signature values, default 1.0.
.TP
.B \-h
Print a help message.
.TP
.BI \-m \ number
Mean of the normal distributed signature values, default 0.0.
.TP
.BI \-n \ number
Length of the watermark. Default value 100.
.TP
.BI \-o \ file
Output signature to the specified 
.I file
instead of standard output.
.TP
.BI \-q \ number
Quantization/quality factor. Default value 3.
.TP
.BI \-s \ number
Specify a seed value to initialize the pseudo-random number 
generator; if not specified, time and pid (process id) are used
to initialize the pseudo-random number generator.
.PP
.SH OUTPUT
The output file has the following format:
.TP
.B CXSG
Magic to identify file type.
.TP
.I number
The length of the signature in bits. 
.TP
.I number
The alpha factor (embedding strength).
.TP
.I number
The quantization/quality factor.
.TP
.I numbers
The actual normal distributed signature values, one per line.
.PP
.SH AUTHOR
Peter Meerwald. Email bug reports to pmeerw@cosy.sbg.ac.at.
.SH AVAILABILITY
The most recent released version of
.B gen_cox_sig
is always available
at http://www.cosy.sbg.ac.at/~pmeerw/Watermarking or via anonymous ftp from ftp.cosy.sbg.ac.at in the
directory /pub/people/pmeerw/Watermarking.
.SH "SEE ALSO"
.BR wm_cox_e
(1),
.BR wm_cox_d
(1),
.BR cmp_cox_sig
(1)