stdev

Name

stdev - calculation of local standard deviation

Syntax

 #include <xite/stdiff.h>

 int stdev( IBAND input, IBAND output, int dx,
    int dy );

Description

stdev calculates and returns the standard deviation in a local window of size dx * dy. The border is also processed, calculating the standard deviation over the part of the window that is defined.

 output(x,y) = sqrt(SUM(sqr(input(x,y)-
                        mean(x,y)))/windowsize)

Restrictions

input and output must have pixel type unsigned byte.

Return value

0 => ok 1 => bad pixel type input 2 => bad pixel type output 3 => bad dx value 4 => bad dy value

Author

Tor Lønnestad, BLAB, Ifi, UiO

Id

$Id: stdev.c,v 1.24 1997/01/10 16:15:09 svein Exp $