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| author | Peter Meerwald-Stadler <pmeerw@pmeerw.net> |
|---|---|
| date | Fri, 20 Dec 2024 13:08:59 +0100 |
| parents | Meerwald/wm_cox_e.1@be303a3f5ea8 |
| children |
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| 23:71dd4b96221b | 24:9f20bce6184e |
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| 1 .\" | |
| 2 .\" wm_cox_e.1 - the *roff document processor man page source | |
| 3 .\" | |
| 4 .TH wm_cox_e 1 "98/07/01" "Watermarking, Version 1.0" | |
| 5 .SH NAME | |
| 6 .B wm_cox_e | |
| 7 \- a program to embed a signature in the DCT coefficients of an image | |
| 8 .SH SYNOPSIS | |
| 9 .B wm_cox_e | |
| 10 [ | |
| 11 .BI \-a \ number | |
| 12 ] | |
| 13 [ | |
| 14 .B \-h | |
| 15 ] | |
| 16 [ | |
| 17 .BI \-o \ ofile | |
| 18 ] | |
| 19 [ | |
| 20 .BI \-q \ number | |
| 21 ] | |
| 22 .BI \-s \ sfile | |
| 23 .I file | |
| 24 .SH DESCRIPTION | |
| 25 .B wm_cox_e | |
| 26 is a program to embed a signature (watermark) from | |
| 27 .I sfile | |
| 28 into the DCT coefficients of an image | |
| 29 .I file | |
| 30 and output a signed (watermarked) image | |
| 31 .I ofile. | |
| 32 Both, input and output image, | |
| 33 are in PGM (portable graymap) format. | |
| 34 .PP | |
| 35 If | |
| 36 .I file | |
| 37 or | |
| 38 .I ofile | |
| 39 is not specified, then standard input or standard output is | |
| 40 used. The signature | |
| 41 .I sfile | |
| 42 is a mandatory parameter however. | |
| 43 .PP | |
| 44 .B gen_cox_sig | |
| 45 is used to generate a signature file, | |
| 46 .B wm_cox_d | |
| 47 extracts a signature from a watermarked image and | |
| 48 .B cmp_cox_sig | |
| 49 allows to compare and test an extracted watermark against the original | |
| 50 signature. | |
| 51 .PP | |
| 52 Please refer to Ingemar J. Cox's paper "Secure Spread Spectrum | |
| 53 Watermarking for Multimedia", 1995, to get an idea about the algorithm. | |
| 54 .PP | |
| 55 .SH OPTIONS | |
| 56 .TP | |
| 57 .BI \-a \ number | |
| 58 Alpha factor that determines embedding strength of the signature. | |
| 59 Allows to override the setting in the signature file. | |
| 60 .TP | |
| 61 .B \-h | |
| 62 Print a help message. | |
| 63 .TP | |
| 64 .BI \-o \ ofile | |
| 65 Output watermarked image to the specified | |
| 66 .I file | |
| 67 instead of standard output. | |
| 68 .TP | |
| 69 .BI \-q \ number | |
| 70 Set quantization/quality factor. Overrides the setting in the signature | |
| 71 file. | |
| 72 .TP | |
| 73 .BI \-s \ sfile | |
| 74 The signature file to embed into the input image. See | |
| 75 .B gen_cox_sig | |
| 76 (1) for a description of the file format. Mandatory parameter. | |
| 77 .IR file | |
| 78 Input image in PGM format to sign (watermark). Default: standard input. | |
| 79 .TP | |
| 80 .I file | |
| 81 The input image in PGM format. | |
| 82 .PP | |
| 83 .SH OUTPUT | |
| 84 The signed (watermarked) image in PGM format is written to standard output | |
| 85 or, optionally, to | |
| 86 .I ofile. | |
| 87 The embedding process may take some time on large images since the DCT | |
| 88 is performed on the whole image in one step (not block-wise). | |
| 89 .PP | |
| 90 The | |
| 91 .I n | |
| 92 largest coefficients are pulsed to embed the | |
| 93 .I n | |
| 94 bit watermark. | |
| 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 wm_cox_e | |
| 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 gen_cox_sig | |
| 106 (1), | |
| 107 .BR wm_cox_d | |
| 108 (1), | |
| 109 .BR cmp_cox_sig | |
| 110 (1) |