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comparison Meerwald-dir/gen_koch_sig.1 @ 24:9f20bce6184e v0.7
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| author | Peter Meerwald-Stadler <pmeerw@pmeerw.net> |
|---|---|
| date | Fri, 20 Dec 2024 13:08:59 +0100 |
| parents | Meerwald/gen_koch_sig.1@be303a3f5ea8 |
| children |
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| 23:71dd4b96221b | 24:9f20bce6184e |
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| 1 .\" | |
| 2 .\" gen_koch_sig.1 - the *roff document processor man page source | |
| 3 .\" | |
| 4 .TH gen_koch_sig 1 "98/06/30" "Watermarking, Version 1.0" | |
| 5 .SH NAME | |
| 6 .B gen_koch_sig | |
| 7 \- a program to generate a signature for | |
| 8 the | |
| 9 .B wm_koch_e | |
| 10 watermarking program | |
| 11 .SH SYNOPSIS | |
| 12 .B gen_koch_sig | |
| 13 [ | |
| 14 .B \-h | |
| 15 ] | |
| 16 [ | |
| 17 .BI \-n \ number | |
| 18 ] | |
| 19 [ | |
| 20 .BI \-o \ file | |
| 21 ] | |
| 22 [ | |
| 23 .BI \-q \ number | |
| 24 ] | |
| 25 [ | |
| 26 .BI \-s \ number | |
| 27 ] | |
| 28 [ | |
| 29 .IR file | |
| 30 ] | |
| 31 .SH DESCRIPTION | |
| 32 .B gen_koch_sig | |
| 33 is a program to generate a signature to be | |
| 34 embedded with the | |
| 35 .B wm_koch_e | |
| 36 watermarking program and extracted with the | |
| 37 .B wm_koch_d | |
| 38 program. The | |
| 39 .B cmp_koch_sig | |
| 40 program is used to compare and test an | |
| 41 extracted signature with the original signature. | |
| 42 .PP | |
| 43 Please refer to E. Koch's paper "Towards Robust and Hidden | |
| 44 Image Copyright", 1995, to get an idea about the algorithm. | |
| 45 .PP | |
| 46 .SH OPTIONS | |
| 47 .TP | |
| 48 .B \-h | |
| 49 Print a help message. | |
| 50 .TP | |
| 51 .BI \-n \ number | |
| 52 Limit the signature length to | |
| 53 .I number | |
| 54 bits (0 < | |
| 55 .I number | |
| 56 <= 1024) unless reading from standard input. When reading from | |
| 57 standard input, the signature is terminated by the first | |
| 58 carriage return character. | |
| 59 .TP | |
| 60 .BI \-o \ file | |
| 61 Output signature to the specified | |
| 62 .I file | |
| 63 instead of standard output. | |
| 64 .TP | |
| 65 .BI \-q \ number | |
| 66 Quality/robustness factor used to embed signature into image. | |
| 67 Default value: 3.0. | |
| 68 .TP | |
| 69 .BI \-s \ number | |
| 70 Specify a seed value to initialize the pseudo-random number | |
| 71 generator; if not specified, time and pid (process id) are used | |
| 72 to initialize the pseudo-random number generator. | |
| 73 .TP | |
| 74 .IR file | |
| 75 Input file to read raw signature data from. Default: standard | |
| 76 input. | |
| 77 .PP | |
| 78 .SH OUTPUT | |
| 79 The output file has the following format: | |
| 80 .TP | |
| 81 .B KCSG | |
| 82 Magic to identify file type. | |
| 83 .TP | |
| 84 .I number | |
| 85 The length of the signature in bits. | |
| 86 .TP | |
| 87 .I number | |
| 88 The quality/robustness factor. | |
| 89 .TP | |
| 90 .I number | |
| 91 The seed value for the pseudo-random number generator. | |
| 92 .TP | |
| 93 .I string | |
| 94 The actual signature bytes. | |
| 95 .PP | |
| 96 .SH AUTHOR | |
| 97 Peter Meerwald. Email bug reports to pmeerw@cosy.sbg.ac.at. | |
| 98 .SH AVAILABILITY | |
| 99 The most recent released version of | |
| 100 .B gen_koch_sig | |
| 101 is always available | |
| 102 at http://www.cosy.sbg.ac.at/~pmeerw/Watermarking or via anonymous ftp from ftp.cosy.sbg.ac.at in the | |
| 103 directory /pub/people/pmeerw/Watermarking. | |
| 104 .SH "SEE ALSO" | |
| 105 .BR wm_koch_e | |
| 106 (1), | |
| 107 .BR wm_koch_d | |
| 108 (1), | |
| 109 .BR cmp_koch_sig | |
| 110 (1) |