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author Peter Meerwald-Stadler <pmeerw@pmeerw.net>
date Fri, 20 Dec 2024 13:08:59 +0100
parents Meerwald/wm_corvi_e.1@be303a3f5ea8
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23:71dd4b96221b 24:9f20bce6184e
1 .\"
2 .\" wm_corvi_e.1 - the *roff document processor man page source
3 .\"
4 .TH wm_corvi_e 1 "98/07/29" "Watermarking, Version 1.0"
5 .SH NAME
6 .B wm_corvi_e
7 \- a program to embed a signature in the DWT residue of an image
8 .SH SYNOPSIS
9 .B wm_corvi_e
10 [
11 .BI \-a \ number
12 ]
13 [
14 .BI \-e \ number
15 ]
16 [
17 .BI \-f \ number
18 ]
19 [
20 .BI \-F \ ffile
21 ]
22 [
23 .BI \-g \ number
24 ]
25 [
26 .B \-h
27 ]
28 [
29 .BI \-o \ ofile
30 ]
31 .br
32 [
33 .BI \-q \ number
34 ]
35 [
36 .BI \-v \ number
37 ]
38 .BI \-s \ sfile
39 .I file
40 .SH DESCRIPTION
41 .B wm_corvi_e
42 is a program to embed a signature (watermark) from
43 .I sfile
44 into the DWT residue of an image
45 .I file
46 and output a signed (watermarked) image
47 .I ofile.
48 Both, input and output image,
49 are in PGM (portable graymap) format.
50 .PP
51 If
52 .I file
53 or
54 .I ofile
55 is not specified, then standard input or standard output is
56 used. The signature
57 .I sfile
58 is a mandatory parameter however.
59 .PP
60 .B gen_corvi_sig
61 is used to generate a signature file,
62 .B wm_corvi_d
63 extracts a signature from a watermarked image and
64 .B cmp_corvi_sig
65 allows to compare and test an extracted watermark against the original
66 signature.
67 .PP
68 Please refer to Marco Corvi's paper "Wavelet-based image watermarking
69 for copyright protection", to get an idea about the algorithm.
70 .PP
71 .SH OPTIONS
72 .TP
73 .BI \-a \ number
74 Alpha factor that determines embedding strength of the signature.
75 Allows to override the setting in the signature file.
76 .TP
77 .BI \-e \ number
78 Wavelet filtering method for forward transformation.
79 Allows to override the setting in the signature file.
80 .TP
81 .BI \-f \ number
82 Wavelet filter number.
83 Allows to override the setting in the signature file.
84 .TP
85 .BI \-F \ ffile
86 Wavelet filter definition file.
87 Allows to override the setting in the signature file.
88 .TP
89 .BI \-g \ number
90 Wavelet filtering method for inverse transformation.
91 Allows to override the setting in the signature file.
92 .TP
93 .B \-h
94 Print a help message.
95 .TP
96 .BI \-o \ ofile
97 Output watermarked image to the specified
98 .I file
99 instead of standard output.
100 .TP
101 .BI \-q \ number
102 Set quantization/quality factor. Overrides the setting in the signature
103 file.
104 .TP
105 .BI \-s \ sfile
106 The signature file to embed into the input image. See
107 .B gen_corvi_sig
108 (1) for a description of the file format. Mandatory parameter.
109 .IR file
110 Input image in PGM format to sign (watermark). Default: standard input.
111 .TP
112 .BI \-v \ number
113 Verbosity level. Specify higher numbers for more informatative
114 output. Default value: 0.
115 .TP
116 .I file
117 The image in PGM format to be watermarked.
118 .PP
119 .SH OUTPUT
120 The signed (watermarked) image in PGM format is written to standard output
121 or, optionally, to
122 .I ofile.
123 The length of the signature (watermark) determines the level of the
124 image residue (coarse image) where the signature is embedded.
125 .PP
126 .SH AUTHOR
127 Peter Meerwald. Email bug reports to pmeerw@cosy.sbg.ac.at.
128 .SH AVAILABILITY
129 The most recent released version of
130 .B wm_corvi_e
131 is always available
132 at http://www.cosy.sbg.ac.at/~pmeerw/Watermarking or via anonymous ftp from ftp.cosy.sbg.ac.at in the
133 directory /pub/people/pmeerw/Watermarking.
134 .SH "SEE ALSO"
135 .BR gen_corvi_sig
136 (1),
137 .BR wm_corvi_d
138 (1),
139 .BR wm_corvi_s
140 (1),
141 .BR cmp_corvi_sig
142 (1)

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