comparison Meerwald/cmp_dct8x8.1 @ 0:be303a3f5ea8

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author Peter Meerwald <pmeerw@cosy.sbg.ac.at>
date Sun, 12 Aug 2007 13:14:34 +0200
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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)

Repositories maintained by Peter Meerwald, pmeerw@pmeerw.net.