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1 .\"
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2 .\" wm_corvi_s.1 - the *roff document processor man page source
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3 .\"
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4 .TH wm_corvi_s 1 "98/07/29" "Watermarking, Version 1.0"
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5 .SH NAME
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6 .B wm_corvi_s
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7 \- a program to extract a signature from the DWT residue of a watermarked
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8 image
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9 .SH SYNOPSIS
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10 .B wm_corvi_s
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11 [
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12 .BI \-a \ number
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13 ]
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14 [
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15 .BI \-e \ number
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16 ]
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17 [
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18 .BI \-f \ number
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19 ]
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20 [
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21 .BI \-F \ ffile
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22 ]
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23 [
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24 .BI \-g \ number
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25 ]
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26 [
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27 .B \-h
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28 ]
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29 [
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30 .BI \-i \ ifile
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31 ]
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32 .br
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33 [
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34 .BI \-n \ number
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35 ]
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36 [
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37 .BI \-o \ ofile
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38 ]
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39 [
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40 .BI \-q \ number
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41 ]
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42 [
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43 .BI \-v \ number
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44 ]
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45 .BI \-s \ sfile
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46 .I file
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47 .SH DESCRIPTION
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48 .B wm_corvi_s
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49 is a program to extract a signature from the DWT residue of
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50 a watermarked image
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51 .I file.
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52 The
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53 .B cmp_corvi_sig
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54 program is used to test the extracted signature against the original signature.
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55 The input image is in PGM (portable graymap) format.
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56 .PP
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57 If
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58 .I file
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59 or
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60 .I ofile
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61 is not specified, then standard input or standard output is
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62 used.
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63 .PP
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64 .B gen_corvi_sig
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65 is used to generate a signature file,
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66 .B wm_corvi_e
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67 embeds the signature into an image.
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68 .PP
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69 Please refer to Marco Corvi's paper "Wavelet-based image watermarking
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70 for copyright protection", to get an idea about the algorithm.
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71 .PP
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72 .SH OPTIONS
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73 .TP
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74 .BI \-a \ number
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75 Alpha factor that determines embedding strength of the signature.
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76 Allows to override the setting in the signature file.
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77 .TP
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78 .BI \-e \ number
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79 Wavelet filtering method for forward transformation.
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80 Allows to override the setting in the signature file.
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81 .TP
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82 .BI \-f \ number
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83 Wavelet filter number.
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84 Allows to override the setting in the signature file.
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85 .TP
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86 .BI \-F \ ffile
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87 Wavelet filter definition file.
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88 Allows to override the setting in the signature file.
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89 .TP
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90 .BI \-g \ number
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91 Wavelet filtering method for inverse transformation.
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92 Allows to override the setting in the signature file.
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93 .TP
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94 .B \-h
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95 Print a help message.
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96 .TP
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97 .BI \-i \ ifile
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98 The original image.
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99 .TP
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100 .BI \-o \ ofile
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101 Output watermarked image to the specified
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102 .I file
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103 instead of standard output.
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104 .TP
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105 .BI \-q \ number
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106 Set quantization/quality factor. Overrides the setting in the signature
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107 file.
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108 .TP
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109 .BI \-v \ number
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110 Verbosity level. Default value: 0.
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111 .TP
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112 .BI \-s \ sfile
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113 The signature file to embed into the input image. See
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114 .B gen_corvi_sig
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115 (1) for a description of the file format. Mandatory parameter.
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116 .IR file
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117 Input image in PGM format to sign (watermark). Default: standard input.
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118 .TP
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119 .I file
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120 The watermarked image in PGM format.
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121 .PP
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122 .SH OUTPUT
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123 The signed (watermarked) image in PGM format is written to standard output
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124 or ,optionally, to
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125 .I ofile.
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126 .PP
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127 The output file has the following format:
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128 .TP
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129 .B CVSG
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130 Magic to identify file type.
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131 .TP
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132 .I number
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133 The length of the signature in bits.
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134 .TP
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135 .I number
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136 The alpha factor (embedding strength).
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137 .TP
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138 .I number
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139 The quantization/quality factor.
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140 .TP
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141 .I number
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142 The wavelet forward transform filtering method.
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143 .TP
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144 .I number
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145 The wavelet filter number.
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146 .I file
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147 The wavelet filter definition file name.
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148 .TP
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149 .I number
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150 The wavelet inverse transform filtering method.
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151 .TP
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152 .I numbers
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153 The actual normal distributed signature values, one per line.
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154 .PP
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155 .SH AUTHOR
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156 Peter Meerwald. Email bug reports to pmeerw@cosy.sbg.ac.at.
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157 .SH AVAILABILITY
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158 The most recent released version of
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159 .B wm_corvi_s
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160 is always available
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161 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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162 directory /pub/people/pmeerw/Watermarking.
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163 .SH "SEE ALSO"
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164 .BR gen_corvi_sig
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165 (1),
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166 .BR wm_corvi_e
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167 (1),
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168 .BR wm_corvi_d
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169 (1),
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170 .BR cmp_corvi_sig
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171 (1)
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