Image
Sliding window formation with four
subwindows
Move to next Sliding window
Choosing Optimum subwindow
Move to next Sliding window
Consider CP(Centre Pixel) in the
chosen Optimim Window
Noise free
Pixel
Noise free
Pixel
N
If CP>T1 &
CP<T2 & PN=1
If (CP<T1 &
CP==T2) or if
(CP>T2 & CP==T1)
or if (CP==T1 &
CP==T2)
N
If CP>T1 &
CP<T2 &
PN=0
Choose four directions which
includes centre pixel
Yes
Pivot = minimum of sum of the
absolute differences in the four
directions
Noisy Pixel
If
Pivot <TT&
PN==0
Replaced in filtering stage
Y
Noise free pixel
(a)
(c)
(b)
(f)
(e)
(a)
(b)
(e)
(d)
(g)
(c)
(f)
(d)
(g)