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1 .\"
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2 .\" gen_corvi_sig.1 - the *roff document processor man page source
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3 .\"
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4 .TH gen_corvi_sig 1 "98/07/17" "Watermarking, Version 1.0"
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5 .SH NAME
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6 .B gen_corvi_sig
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7 \- a program to generate a signature for
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8 the
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9 .B wm_corvi_e
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10 watermarking program
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11 .SH SYNOPSIS
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12 .B gen_corvi_sig
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13 [
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14 .BI \-a \ number
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15 ]
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16 [
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17 .BI \-d \ number
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18 ]
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19 [
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20 .BI \-e \ number
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21 ]
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22 [
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23 .BI \-f \ number
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24 ]
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25 [
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26 .BI \-F \ ffile
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27 ]
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28 [
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29 .BI \-g \ number
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30 ]
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31 .br
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32 [
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33 .B \-h
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34 ]
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35 [
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36 .BI \-m \ number
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37 ]
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38 [
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39 .BI \-n \ number
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40 ]
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41 [
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42 .BI \-o \ file
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43 ]
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44 [
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45 .BI \-q \ number
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46 ]
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47 [
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48 .BI \-s \ number
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49 ]
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50 .SH DESCRIPTION
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51 .B gen_corvi_sig
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52 is a program to generate a signature to be
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53 embedded with the
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54 .B wm_corvi_e
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55 watermarking program and extracted with the
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56 .B wm_corvi_d
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57 program. The
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58 .B cmp_corvi_sig
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59 program is used to compare and test an
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60 extracted signature with the original signature.
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61 .PP
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62 Please refer to Marco Corvi's paper "Wavlet-based image watermarking
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63 for copyright protection", to get an idea of the algorithm.
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64 .PP
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65 .SH OPTIONS
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66 .TP
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67 .BI \-a \ number
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68 Alpha factor that determines embedding strength of the signature. Default
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69 value 0.3.
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70 .TP
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71 .BI \-d \ number
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72 Deviation for the normal distributed signature values, default 1.0.
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73 .TP
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74 .BI \-e \ number
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75 The filtering method for the forward wavelet transform. Default value
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76 1.
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77 .TP
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78 .BI \-F \ ffile
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79 The filter definition file. Default
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80 .I filter.dat.
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81 .TP
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82 .BI \-f \ number
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83 Use the
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84 .I number
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85 filter from the filter definition file,
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86 .I ffile. Default: 1.
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87 .TP
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88 .BI \-g \ number
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89 The filtering method for the inverse wavelet transform. Default value
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90 2.
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91 .TP
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92 .B \-h
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93 Print a help message.
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94 .TP
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95 .BI \-m \ number
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96 Mean of the normal distributed signature values, default 0.0.
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97 .TP
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98 .BI \-n \ number
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99 Length of the watermark. Default value 100.
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100 .TP
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101 .BI \-o \ file
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102 Output signature to the specified
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103 .I file
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104 instead of standard output.
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105 .TP
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106 .BI \-q \ number
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107 Quantization/quality factor. Default value 3.
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108 .TP
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109 .BI \-s \ number
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110 Specify a seed value to initialize the pseudo-random number
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111 generator; if not specified, time and pid (process id) are used
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112 to initialize the pseudo-random number generator.
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113 .PP
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114 .SH OUTPUT
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115 The output file has the following format:
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116 .TP
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117 .B CVSG
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118 Magic to identify file type.
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119 .TP
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120 .I number
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121 The length of the signature in bits.
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122 .TP
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123 .I number
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124 The alpha factor (embedding strength).
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125 .TP
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126 .I number
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127 The quantization/quality factor.
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128 .TP
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129 .I number
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130 The wavelet forward transform filtering method.
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131 .TP
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132 .I number
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133 The wavelet filter number.
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134 .TP
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135 .I file
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136 The wavelet filter definition file name.
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137 .TP
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138 .I number
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139 The wavelet inverse transform filtering method.
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140 .TP
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141 .I numbers
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142 The actual normal distributed signature values, one per line.
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143 .PP
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144 .SH AUTHOR
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145 Peter Meerwald.
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146 Email bug reports to pmeerw@cosy.sbg.ac.at.
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147 .SH AVAILABILITY
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148 The most recent released version of
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149 .B gen_corvi_sig
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150 is always available
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151 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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152 directory /pub/people/pmeerw/Watermarking.
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153 .SH "SEE ALSO"
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154 .BR wm_corvi_e
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155 (1),
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156 .BR wm_corvi_d
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157 (1),
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158 .BR wm_corvi_s
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159 (1),
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160 .BR cmp_corvi_sig
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161 (1)
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