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