|
0
|
1 .\"
|
|
|
2 .\" gen_koch_sig.1 - the *roff document processor man page source
|
|
|
3 .\"
|
|
|
4 .TH gen_koch_sig 1 "98/06/30" "Watermarking, Version 1.0"
|
|
|
5 .SH NAME
|
|
|
6 .B gen_koch_sig
|
|
|
7 \- a program to generate a signature for
|
|
|
8 the
|
|
|
9 .B wm_koch_e
|
|
|
10 watermarking program
|
|
|
11 .SH SYNOPSIS
|
|
|
12 .B gen_koch_sig
|
|
|
13 [
|
|
|
14 .B \-h
|
|
|
15 ]
|
|
|
16 [
|
|
|
17 .BI \-n \ number
|
|
|
18 ]
|
|
|
19 [
|
|
|
20 .BI \-o \ file
|
|
|
21 ]
|
|
|
22 [
|
|
|
23 .BI \-q \ number
|
|
|
24 ]
|
|
|
25 [
|
|
|
26 .BI \-s \ number
|
|
|
27 ]
|
|
|
28 [
|
|
|
29 .IR file
|
|
|
30 ]
|
|
|
31 .SH DESCRIPTION
|
|
|
32 .B gen_koch_sig
|
|
|
33 is a program to generate a signature to be
|
|
|
34 embedded with the
|
|
|
35 .B wm_koch_e
|
|
|
36 watermarking program and extracted with the
|
|
|
37 .B wm_koch_d
|
|
|
38 program. The
|
|
|
39 .B cmp_koch_sig
|
|
|
40 program is used to compare and test an
|
|
|
41 extracted signature with the original signature.
|
|
|
42 .PP
|
|
|
43 Please refer to E. Koch's paper "Towards Robust and Hidden
|
|
|
44 Image Copyright", 1995, to get an idea about the algorithm.
|
|
|
45 .PP
|
|
|
46 .SH OPTIONS
|
|
|
47 .TP
|
|
|
48 .B \-h
|
|
|
49 Print a help message.
|
|
|
50 .TP
|
|
|
51 .BI \-n \ number
|
|
|
52 Limit the signature length to
|
|
|
53 .I number
|
|
|
54 bits (0 <
|
|
|
55 .I number
|
|
|
56 <= 1024) unless reading from standard input. When reading from
|
|
|
57 standard input, the signature is terminated by the first
|
|
|
58 carriage return character.
|
|
|
59 .TP
|
|
|
60 .BI \-o \ file
|
|
|
61 Output signature to the specified
|
|
|
62 .I file
|
|
|
63 instead of standard output.
|
|
|
64 .TP
|
|
|
65 .BI \-q \ number
|
|
|
66 Quality/robustness factor used to embed signature into image.
|
|
|
67 Default value: 3.0.
|
|
|
68 .TP
|
|
|
69 .BI \-s \ number
|
|
|
70 Specify a seed value to initialize the pseudo-random number
|
|
|
71 generator; if not specified, time and pid (process id) are used
|
|
|
72 to initialize the pseudo-random number generator.
|
|
|
73 .TP
|
|
|
74 .IR file
|
|
|
75 Input file to read raw signature data from. Default: standard
|
|
|
76 input.
|
|
|
77 .PP
|
|
|
78 .SH OUTPUT
|
|
|
79 The output file has the following format:
|
|
|
80 .TP
|
|
|
81 .B KCSG
|
|
|
82 Magic to identify file type.
|
|
|
83 .TP
|
|
|
84 .I number
|
|
|
85 The length of the signature in bits.
|
|
|
86 .TP
|
|
|
87 .I number
|
|
|
88 The quality/robustness factor.
|
|
|
89 .TP
|
|
|
90 .I number
|
|
|
91 The seed value for the pseudo-random number generator.
|
|
|
92 .TP
|
|
|
93 .I string
|
|
|
94 The actual signature bytes.
|
|
|
95 .PP
|
|
|
96 .SH AUTHOR
|
|
|
97 Peter Meerwald. Email bug reports to pmeerw@cosy.sbg.ac.at.
|
|
|
98 .SH AVAILABILITY
|
|
|
99 The most recent released version of
|
|
|
100 .B gen_koch_sig
|
|
|
101 is always available
|
|
|
102 at http://www.cosy.sbg.ac.at/~pmeerw/Watermarking or via anonymous ftp from ftp.cosy.sbg.ac.at in the
|
|
|
103 directory /pub/people/pmeerw/Watermarking.
|
|
|
104 .SH "SEE ALSO"
|
|
|
105 .BR wm_koch_e
|
|
|
106 (1),
|
|
|
107 .BR wm_koch_d
|
|
|
108 (1),
|
|
|
109 .BR cmp_koch_sig
|
|
|
110 (1)
|
