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STDEV
Section: User Commands (1)
Updated: 16 Mar 1998
Index
NAME
stdev - calculation of local standard deviation
SYNTAX
stdev <inimage> <outimage> [<dx> [<dy>]]
DESCRIPTION
stdevcalculates and returns the standarddeviation in a local window of size
dx*
dy.The border is also processed, calculating thestandard deviation over the part of the windowthat is defined.
output(x,y) = sqrt(SUM(sqr(input(x,y)-
mean(x,y)))/windowsize)
dxis the horizontal window size, default value 3.dyis the vertical window size, default value dx.
RESTRICTIONS
inimagemust have bands with pixel type unsigned byte.If
dxor
dyare even, they are increased by one.
dxand
dyshould be positive.
SEE ALSO
AUTHOR
Tor Lønnestad, BLAB, Ifi, UiO.
EXAMPLES
stdev mona.img monaStd.img
stdev mona.img monaStd.img 15
stdev mona.img monaStd.img 5 9
ID
$Id: stdev.c,v 1.24 1997/01/10 16:15:09 svein Exp $
Index
- NAME
- SYNTAX
- DESCRIPTION
- RESTRICTIONS
- SEE ALSO
- AUTHOR
- EXAMPLES
- ID
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