FBCONV

Section: User Commands (1)
Updated: 03-Jun-93
Index Return to Main Contents
 

NAME

fbconv - convert image format  

SYNOPSIS

fbconv [ -<type> ] [ -c ] <n> <k00> <k01> .. <kNN> < 8bit > 8bit

fbconv [ -<type> ] [ -s ] < 8bit > 8bit
 

DESCRIPTION

A general convolution filter.  

OPTIONS

-s
Sobel, Calculate the Sobel gradient instead of a simple convolution. The -s5 option calculates a 5x5 analog of the Sobel filter.
 

EXAMPLE

To compute a simple area averaging, you could use:

% fbconv 3 0.1 0.1 0.1 0.1 0.2 0.1 0.1 0.1 0.1 < 8bit > 8bit

It's much easier to keep filters in a file, and then use the csh's backquote mechanism to include them in the argument list. For example, if smooth.5x5 contains these numbers:

5
0.000  0.025  0.050  0.025  0.000
0.025  0.050  0.075  0.050  0.025
0.050  0.075  0.100  0.075  0.050
0.025  0.050  0.075  0.050  0.025
0.000  0.025  0.050  0.025  0.000

then this command will apply this filter to an image:


    % fbconv `cat smooth.5x5` < 8bit > 8bit

 

SEE ALSO

fbm(1) for general discussion, fbsample(1) for 1bit to 8bit averaging.  

BUGS

None known.  

HISTORY

Copyright (C) 1993 by Michael Mauldin. Permission is granted to use this file in whole or in part for any purpose, educational, recreational or commercial, provided that this copyright notice is retained unchanged. This software is available to all free of charge by anonymous FTP and in the UUNET archives.
03-Jun-93 Michael Mauldin at Carnegie Mellon University
Created.


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
EXAMPLE
SEE ALSO
BUGS
HISTORY

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Time: 04:11:01 GMT, November 29, 2024