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FRACTILE
Section: User Commands (1)
Updated: 16 Mar 1998
Index
NAME
fractile - noise reduction filtering
SYNTAX
fractile <inimage> <outimage> fractile [<dx> [<dy>]]
DESCRIPTION
Fractile noise filtering with window
dx*
dyusing the histogram updating technique.
Sorts all pixels within the window and picks thefractilepixel. fractile = 1/dx/dygives min-filter,fractile = 0.5gives median filter, andfractile = 1.0-1/dx/dygives max-filter.
fractilemust be non-negative and maximum 1.0.Default value for dxis 3, for dyit is dx.
REFERENCE
Huang, Yang and Tang:"A Fast Two-Dimensional Median Filtering Algorithm"IEEE Trans. Ac., Speech, and Signal Proc, Vol ASSP-27,No.1, Feb.1979
SEE ALSO
pseudomedian3x3(1),
median(1),
minarea(1),
maxarea(1)
RESTRICTIONS
Accepts only images with pixel type unsigned byte.
dxand
dymust be larger than 0.
AUTHOR
Tor Lønnestad, BLAB, Ifi, UiO
MODIFIED
Otto Milvang, BLAB, Ifi, UiO
EXAMPLES
fractile mona.img mona.30.img 0.3
fractile mona.img mona.40.img 0.4 7
fractile mona.img mona.60.img 0.6 7 5
ID
$Id: fractile.c,v 1.22 1997/03/07 12:52:08 svein Exp $
Index
- NAME
- SYNTAX
- DESCRIPTION
- REFERENCE
- SEE ALSO
- RESTRICTIONS
- AUTHOR
- MODIFIED
- EXAMPLES
- ID
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