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comparison Meerwald-dir/wm_koch_e.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/wm_koch_e.1@be303a3f5ea8 |
| children |
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| 23:71dd4b96221b | 24:9f20bce6184e |
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| 1 .\" | |
| 2 .\" wm_koch_e.1 - the *roff document processor man page source | |
| 3 .\" | |
| 4 .TH wm_koch_e 1 "98/07/05" "Watermarking, Version 1.0" | |
| 5 .SH NAME | |
| 6 .B wm_koch_e | |
| 7 \- a program to embed signature bits in the DCT coefficients of an image | |
| 8 .SH SYNOPSIS | |
| 9 .B wm_koch_e | |
| 10 [ | |
| 11 .B \-h | |
| 12 ] | |
| 13 [ | |
| 14 .BI \-o \ ofile | |
| 15 ] | |
| 16 [ | |
| 17 .BI \-q \ number | |
| 18 ] | |
| 19 [ | |
| 20 .BI \-v \ number | |
| 21 ] | |
| 22 .BI \-s \ sfile | |
| 23 .IR file | |
| 24 .SH DESCRIPTION | |
| 25 .B wm_koch_e | |
| 26 is a program to embed signature bits in 8x8 DCT coefficients of | |
| 27 an image. The signature has to be generated by the | |
| 28 .B gen_koch_sig | |
| 29 program. The | |
| 30 .B wm_koch_d | |
| 31 program is used to extract a signature from a signed (watermarked) image. The | |
| 32 .B cmp_koch_sig | |
| 33 program compares and tests the extracted signature against the original signature. | |
| 34 .PP | |
| 35 Both, input and output image, | |
| 36 are in PGM (portable graymap) format. | |
| 37 .PP | |
| 38 If | |
| 39 .I file | |
| 40 or | |
| 41 .I ofile | |
| 42 is not specified, then standard input or standard output is | |
| 43 used. The signature | |
| 44 .I sfile | |
| 45 is a mandatory parameter however. | |
| 46 .PP | |
| 47 Please refer to E. Koch's paper "Towards Robust and Hidden | |
| 48 Image Copyright", 1995, to get an idea about the algorithm. | |
| 49 .PP | |
| 50 .SH OPTIONS | |
| 51 .TP | |
| 52 .B \-h | |
| 53 Print a help message. | |
| 54 .TP | |
| 55 .BI \-o \ ofile | |
| 56 Output signed (watermarked) image to | |
| 57 .I ofile | |
| 58 instead of standard output. | |
| 59 .TP | |
| 60 .BI \-q \ number | |
| 61 Quality/robustness factor used to embed signature into image. | |
| 62 Overrides setting from signature file. | |
| 63 .TP | |
| 64 .BI \-s \ sfile | |
| 65 The signature file to embed into image. See | |
| 66 .B gen_koch_sig | |
| 67 (1) for a description of the file format. Mandatory parameter. | |
| 68 .TP | |
| 69 .BI \-v \ number | |
| 70 Verbosity level. 0 for quiet operation, higher numbers for more | |
| 71 output. Default value: 0. | |
| 72 .TP | |
| 73 .IR file | |
| 74 Input image in PGM format to sign (watermark). Default: standard input. | |
| 75 .PP | |
| 76 .SH OUTPUT | |
| 77 The signed (watermarked) image in PGM format is written to standard output | |
| 78 or, optionally, to | |
| 79 .I ofile. | |
| 80 .PP | |
| 81 Two coefficients of an 8x8 DCT block are selected at random to embed a | |
| 82 single signature bit. | |
| 83 .PP | |
| 84 .SH AUTHOR | |
| 85 Peter Meerwald. Email bug reports to pmeerw@cosy.sbg.ac.at. | |
| 86 .SH AVAILABILITY | |
| 87 The most recent released version of | |
| 88 .B wm_koch_e | |
| 89 is always available | |
| 90 at http://www.cosy.sbg.ac.at/~pmeerw/Watermarking or via anonymous ftp from ftp.cosy.sbg.ac.at in the | |
| 91 directory /pub/people/pmeerw/Watermarking. | |
| 92 .SH "SEE ALSO" | |
| 93 .BR gen_koch_sig | |
| 94 (1), | |
| 95 .BR wm_koch_d | |
| 96 (1), | |
| 97 .BR cmp_koch_sig | |
| 98 (1) |