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