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1 .\"
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2 .\" gen_cox_sig.1 - the *roff document processor man page source
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3 .\"
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4 .TH gen_cox_sig 1 "98/06/30" "Watermarking, Version 1.0"
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5 .SH NAME
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6 .B gen_cox_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_cox_e
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10 watermarking program
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11 .SH SYNOPSIS
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12 .B gen_cox_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 .B \-h
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21 ]
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22 [
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23 .BI \-m \ number
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24 ]
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25 [
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26 .BI \-n \ number
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27 ]
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28 [
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29 .BI \-o \ file
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30 ]
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31 [
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32 .BI \-q \ number
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33 ]
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34 [
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35 .BI \-s \ number
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36 ]
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37 .SH DESCRIPTION
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38 .B gen_cox_sig
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39 is a program to generate a signature to be
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40 embedded with the
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41 .B wm_cox_e
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42 watermarking program and extracted with the
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43 .B wm_cox_d
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44 program. The
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45 .B cmp_cox_sig
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46 program is used to compare and test an
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47 extracted signature with the original signature.
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48 .PP
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49 Please refer to Ingemar J. Cox's paper "Secure Spread Spectrum
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50 Watermarking for Multimedia", 1995, to get an idea about the algorithm.
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51 .PP
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52 .SH OPTIONS
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53 .TP
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54 .BI \-a \ number
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55 Alpha factor that determines embedding strength of the signature. Default
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56 value 0.3.
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57 .TP
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58 .BI \-d \ number
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59 Deviation for the normal distributed signature values, default 1.0.
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60 .TP
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61 .B \-h
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62 Print a help message.
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63 .TP
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64 .BI \-m \ number
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65 Mean of the normal distributed signature values, default 0.0.
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66 .TP
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67 .BI \-n \ number
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68 Length of the watermark. Default value 100.
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69 .TP
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70 .BI \-o \ file
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71 Output signature to the specified
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72 .I file
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73 instead of standard output.
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74 .TP
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75 .BI \-q \ number
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76 Quantization/quality factor. Default value 3.
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77 .TP
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78 .BI \-s \ number
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79 Specify a seed value to initialize the pseudo-random number
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80 generator; if not specified, time and pid (process id) are used
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81 to initialize the pseudo-random number generator.
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82 .PP
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83 .SH OUTPUT
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84 The output file has the following format:
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85 .TP
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86 .B CXSG
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87 Magic to identify file type.
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88 .TP
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89 .I number
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90 The length of the signature in bits.
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91 .TP
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92 .I number
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93 The alpha factor (embedding strength).
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94 .TP
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95 .I number
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96 The quantization/quality factor.
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97 .TP
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98 .I numbers
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99 The actual normal distributed signature values, one per line.
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100 .PP
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101 .SH AUTHOR
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102 Peter Meerwald. Email bug reports to pmeerw@cosy.sbg.ac.at.
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103 .SH AVAILABILITY
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104 The most recent released version of
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105 .B gen_cox_sig
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106 is always available
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107 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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108 directory /pub/people/pmeerw/Watermarking.
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109 .SH "SEE ALSO"
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110 .BR wm_cox_e
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111 (1),
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112 .BR wm_cox_d
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113 (1),
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114 .BR cmp_cox_sig
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115 (1)
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