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comparison Meerwald-dir/cmp_dct8x8.1 @ 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/cmp_dct8x8.1@be303a3f5ea8 |
| children |
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| 23:71dd4b96221b | 24:9f20bce6184e |
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| 1 .\" | |
| 2 .\" cmp_dct8x8.1 - the *roff document processor man page source | |
| 3 .\" | |
| 4 .TH cmp_dct8x8 1 "98/07/08" "Watermarking, Version 1.0" | |
| 5 .SH NAME | |
| 6 cmp_dct8x8 \- a program to create the difference image of the | |
| 7 8x8 DCT blocks of two PGM images | |
| 8 .SH SYNOPSIS | |
| 9 .B cmp_dct8x8 | |
| 10 [ | |
| 11 .B \-h | |
| 12 ] | |
| 13 [ | |
| 14 .BI \-m \ number | |
| 15 ] | |
| 16 [ | |
| 17 .BI \-o \ ofile | |
| 18 ] | |
| 19 .BI \-i \ ifile | |
| 20 .I file | |
| 21 .SH DESCRIPTION | |
| 22 .B cmp_dct8x8 | |
| 23 is a program to create the difference image of the 8x8 DCT blocks | |
| 24 (frequency domain) of two PGM (portable graymap) grayscale | |
| 25 images. To compare images in the spatial domain, either in | |
| 26 PPM (portable pixmap) format for RGB color images or in PGM (portable | |
| 27 graymap) format for grayscale images, use the | |
| 28 .B cmp_ppm | |
| 29 program or the | |
| 30 .B cmp_pgm | |
| 31 program, respectively. | |
| 32 .PP | |
| 33 If | |
| 34 .I file | |
| 35 or | |
| 36 .I ofile | |
| 37 is not specified, then standard input or standard output is | |
| 38 used. | |
| 39 .PP | |
| 40 .SH OPTIONS | |
| 41 .TP | |
| 42 .B \-h | |
| 43 Print a help message. | |
| 44 .TP | |
| 45 .BI \-i \ ifile | |
| 46 The original image. Mandatory. | |
| 47 .TP | |
| 48 .BI \-m \ number | |
| 49 Multiplication factor to magnify differences between the to | |
| 50 original and input image. | |
| 51 Default value: 16. | |
| 52 .TP | |
| 53 .BI \-o \ ofile | |
| 54 Output image file to contain the difference image in PGM format. | |
| 55 .TP | |
| 56 .I file | |
| 57 Input image that is compared against | |
| 58 .I ifile. | |
| 59 Default: standard input. | |
| 60 .SH OUTPUT | |
| 61 The difference image in PGM format is written to standard output or, | |
| 62 optionally, to | |
| 63 .I ofile. | |
| 64 .SH AUTHOR | |
| 65 Peter Meerwald. | |
| 66 Email bug reports to pmeerw@cosy.sbg.ac.at. | |
| 67 .SH AVAILABILITY | |
| 68 The most recent released version of | |
| 69 .B cmp_dct8x8 | |
| 70 is always available | |
| 71 at http://www.cosy.sbg.ac.at/~pmeerw/Watermarking or via anonymous ftp from ftp.cosy.sbg.ac.at in the | |
| 72 directory /pub/people/pmeerw/Watermarking. | |
| 73 .SH "SEE ALSO" | |
| 74 .B cmp_pgm | |
| 75 (1), | |
| 76 .B cmp_ppm | |
| 77 (1), | |
| 78 .B cmp_dct | |
| 79 (1) |