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Re: Filter image with moving window and averaging pixels [message #52422 is a reply to message #52350]

Thu, 01 February 2007 08:13

rpertaub@gmail.com
Messages: 43
Registered: January 2007

Member

Thank you for the responses!! Really great to know I am not alone as I
learn my way thru this language!

Anyway, I ended up doing a some arithmetic to find neighboring pixels
and used a couple of for loops to go through all the pixels in the
image.(still need to add a border to image to get all these pixels)!!
It is not very elegant, but once I have everything working, I might go
back and make it more elegant with the kernel and convol function
which I am
still trying to grasp does exactly!

w=2 ;width of buffer pixels
for j=2,(imagesize[0]-1-w) DO BEGIN
for i=2,(imagesize[1]-1-w) DO BEGIN

centervalue=N[i,j]
print,"Center Value is ",centervalue

topH=N[(i-w):(i+w),(j-w):(j-w)]
sum1=total(topH)
ele1=N_elements(topH)

rghtside=N[(i+w):(i+w),(j-w+1):(j+w)]
sum2=total(rghtside)
ele2=N_elements(rghtside)

BtmH=N[(i-w):(i+w-1),(j+w):(j+w)]
sum3=total(BtmH)
ele3=N_elements(BtmH)

Lftside=N[(i-w):(i-w),(j-w+1):(j+w-1)]
sum4=total(Lftside)
ele4=N_elements(Lftside)

Average=float((sum1+sum2+sum3+sum4)/(ele1+ele2+ele3+ele4))
print, "Total Average is ",average
ratio = float(average/centervalue)
print,"Ratio is average of border divided bycenter",ratio

endfor
endfor

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[Message index]

		Filter image with moving window and averaging pixels By: rpertaub@gmail.com on Wed, 31 January 2007 10:58
		Re: Filter image with moving window and averaging pixels By: rpertaub@gmail.com on Thu, 01 February 2007 08:13
		Re: Filter image with moving window and averaging pixels By: JD Smith on Wed, 31 January 2007 15:52
		Re: Filter image with moving window and averaging pixels By: Michael Galloy on Wed, 31 January 2007 15:55

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