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KNN
Section: C Library Functions (3)
Updated: 16 Mar 1998
Index
NAME
knn - k nearest neighbour noise reduction
SYNTAX
#include <
xite/knn.h>
int knn( IBAND input, IBAND output, int n,
int k );
DESCRIPTION
knnperforms
knearest neighbour noise reduction,averaging over the center pixel and the
knearest neighbours. If
nis even
n+1 is used.Uses histogram updating.
nis the width of a square window. kis the number ofneighbours to average over.
RESTRICTIONS
inputand
outputmust have pixeltype unsigned byte.
REFERENCE
L. S. Davis & A. Rosenfeld:"Noise Cleaning byIterated Local Averaging" IEEE trans. on syst.,man, and cyb., vol smc-8, no 9, 1978.
SEE ALSO
knn(1),
mbknn(3),
kncn(3),
mbkncn(3)
RETURN VALUE
0 => ok
1 => Bad input pixel type
2 => Bad output pixel type
3 => Bad n value (less than 1)
4 => Bad k value (less than 1 or larger than n**2-1)
AUTHOR
Tor Lønnestad, BLAB, Ifi, UiO
ID
$Id: knn.c,v 1.24 1997/01/10 16:03:52 svein Exp $
Index
- NAME
- SYNTAX
- DESCRIPTION
- RESTRICTIONS
- REFERENCE
- SEE ALSO
- RETURN VALUE
- AUTHOR
- ID
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