Mercurial > hg > wm

comparison Meerwald-dir/gen_kutter_sig.1 @ 24:9f20bce6184e v0.7

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
move directories, support netpbm 11
author Peter Meerwald-Stadler <pmeerw@pmeerw.net>
date Fri, 20 Dec 2024 13:08:59 +0100
parents Meerwald/gen_kutter_sig.1@be303a3f5ea8
children
comparison
equal deleted inserted replaced
23:71dd4b96221b 24:9f20bce6184e
1 .\"
2 .\" gen_kutter_sig.1 - the *roff document processor man page source
3 .\"
4 .TH gen_kutter_sig 1 "98/06/30" "Watermarking, Version 1.0"
5 .SH NAME
6 .B gen_kutter_sig
7 \- a program to generate a signature for
8 the
9 .B wm_kutter_e
10 watermarking program
11 .SH SYNOPSIS
12 .B gen_kutter_sig
13 [
14 .B \-h
15 ]
16 [
17 .BI \-n \ number
18 ]
19 [
20 .BI \-o \ file
21 ]
22 [
23 .BI \-p \ number
24 ]
25 [
26 .BI \-q \ number
27 ]
28 [
29 .BI \-r \ number
30 ]
31 .br
32 [
33 .BI \-s \ number
34 ]
35 [
36 .I file
37 ]
38 .SH DESCRIPTION
39 .B gen_kutter_sig
40 is a program to generate a signature to be
41 embedded with the
42 .B wm_kutter_e
43 watermarking program and extracted with the
44 .B wm_kutter_d
45 program. The
46 .B cmp_kutter_sig
47 program is used to compare and test an
48 extracted signature with the original signature.
49 .PP
50 Please refer to M. Kutter's paper "Digital Signature of Color Images
51 using Amplitude Modulation", 1997, to get an idea about the algorithm.
52 .PP
53 .SH OPTIONS
54 .TP
55 .B \-h
56 Print a help message.
57 .TP
58 .BI \-n \ number
59 Limit the signature length to
60 .I number
61 bits (0 <
62 .I number
63 <= 1024) unless reading from standard input. When reading from
64 standard input, the signature is terminated by the first
65 carriage return character.
66 .TP
67 .BI \-o \ file
68 Output signature to the specified
69 .TP
70 .BI \-p \ number
71 Density parameter in the range 0.0 <
72 .I number
73 <= 1.0. Default value 0.01.
74 .TP
75 .BI \-q \ number
76 Signature strength. Default value 0.1.
77 .TP
78 .BI \-r \ number
79 Signature bit repetition factor. Specifies how often a single
80 signature bit is embedded. Default value 8.
81 .I file
82 instead of standard output.
83 .TP
84 .BI \-s \ number
85 Specify a seed value to initialize the pseudo-random number
86 generator; if not specified, time and pid (process id) are used
87 to initialize the pseudo-random number generator.
88 .TP
89 .I file
90 Input file to read raw signature data from. Default: standard
91 input.
92 .PP
93 .SH OUTPUT
94 The output file has the following format:
95 .TP
96 .B KTSG
97 Magic to identify file type.
98 .TP
99 .I number
100 The length of the signature in bits.
101 .TP
102 .I number
103 The density parameter.
104 .TP
105 .I number
106 The signature strength.
107 .TP
108 .I number
109 The bit repetition parameter.
110 .TP
111 .I number
112 The seed value for the pseudo-random number generator.
113 .TP
114 .I string
115 The actual signature bytes.
116 .PP
117 .SH AUTHOR
118 Peter Meerwald. Email bug reports to pmeerw@cosy.sbg.ac.at.
119 .SH AVAILABILITY
120 The most recent released version of
121 .B gen_kutter_sig
122 is always available
123 at http://www.cosy.sbg.ac.at/~pmeerw/Watermarking or via anonymous ftp from ftp.cosy.sbg.ac.at in the
124 directory /pub/people/pmeerw/Watermarking.
125 .SH "SEE ALSO"
126 .BR wm_kutter_e
127 (1),
128 .BR wm_kutter_d
129 (1),
130 .BR cmp_kutter_sig
131 (1)

Repositories maintained by Peter Meerwald, pmeerw@pmeerw.net.