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1 .\"
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2 .\" gen_kutter_sig.1 - the *roff document processor man page source
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3 .\"
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4 .TH gen_kutter_sig 1 "98/06/30" "Watermarking, Version 1.0"
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5 .SH NAME
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6 .B gen_kutter_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_kutter_e
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10 watermarking program
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11 .SH SYNOPSIS
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12 .B gen_kutter_sig
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13 [
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14 .B \-h
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15 ]
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16 [
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17 .BI \-n \ number
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18 ]
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19 [
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20 .BI \-o \ file
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21 ]
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22 [
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23 .BI \-p \ number
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24 ]
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25 [
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26 .BI \-q \ number
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27 ]
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28 [
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29 .BI \-r \ number
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30 ]
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31 .br
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32 [
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33 .BI \-s \ number
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34 ]
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35 [
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36 .I file
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37 ]
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38 .SH DESCRIPTION
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39 .B gen_kutter_sig
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40 is a program to generate a signature to be
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41 embedded with the
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42 .B wm_kutter_e
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43 watermarking program and extracted with the
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44 .B wm_kutter_d
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45 program. The
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46 .B cmp_kutter_sig
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47 program is used to compare and test an
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48 extracted signature with the original signature.
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49 .PP
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50 Please refer to M. Kutter's paper "Digital Signature of Color Images
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51 using Amplitude Modulation", 1997, to get an idea about the algorithm.
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52 .PP
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53 .SH OPTIONS
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54 .TP
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55 .B \-h
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56 Print a help message.
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57 .TP
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58 .BI \-n \ number
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59 Limit the signature length to
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60 .I number
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61 bits (0 <
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62 .I number
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63 <= 1024) unless reading from standard input. When reading from
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64 standard input, the signature is terminated by the first
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65 carriage return character.
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66 .TP
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67 .BI \-o \ file
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68 Output signature to the specified
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69 .TP
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70 .BI \-p \ number
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71 Density parameter in the range 0.0 <
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72 .I number
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73 <= 1.0. Default value 0.01.
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74 .TP
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75 .BI \-q \ number
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76 Signature strength. Default value 0.1.
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77 .TP
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78 .BI \-r \ number
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79 Signature bit repetition factor. Specifies how often a single
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80 signature bit is embedded. Default value 8.
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81 .I file
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82 instead of standard output.
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83 .TP
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84 .BI \-s \ number
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85 Specify a seed value to initialize the pseudo-random number
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86 generator; if not specified, time and pid (process id) are used
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87 to initialize the pseudo-random number generator.
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88 .TP
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89 .I file
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90 Input file to read raw signature data from. Default: standard
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91 input.
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92 .PP
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93 .SH OUTPUT
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94 The output file has the following format:
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95 .TP
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96 .B KTSG
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97 Magic to identify file type.
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98 .TP
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99 .I number
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100 The length of the signature in bits.
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101 .TP
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102 .I number
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103 The density parameter.
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104 .TP
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105 .I number
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106 The signature strength.
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107 .TP
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108 .I number
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109 The bit repetition parameter.
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110 .TP
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111 .I number
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112 The seed value for the pseudo-random number generator.
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113 .TP
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114 .I string
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115 The actual signature bytes.
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116 .PP
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117 .SH AUTHOR
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118 Peter Meerwald. Email bug reports to pmeerw@cosy.sbg.ac.at.
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119 .SH AVAILABILITY
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120 The most recent released version of
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121 .B gen_kutter_sig
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122 is always available
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123 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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124 directory /pub/people/pmeerw/Watermarking.
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125 .SH "SEE ALSO"
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126 .BR wm_kutter_e
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127 (1),
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128 .BR wm_kutter_d
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129 (1),
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130 .BR cmp_kutter_sig
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131 (1)
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