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Re: Extracting average pixel value [message #66175 is a reply to message #66174]

Thu, 23 April 2009 10:00

Juggernaut
Messages: 83
Registered: June 2008

Member

On Apr 22, 3:48 am, GP <gepo...@gmail.com> wrote:
> Hello...
>
> I have an .img file composed of 24 images (one every two weeks) and I
> want to extract an spectral average pixel value for a 3x3 window with
> the center pixel in sample=4567 and line 643.
> Anyone know what would be the best approach to do this with IDL or
> ENVI?
>
> The .img file is a layer stacking... So the 24 images are represented
> as "bands" if I open it with ENVI
>
> Thanks in advance...
> Geo

In IDL you can do a
newArray = CONVOL(imageArray, [[1,1,1],[1,0,1],[1,1,1]], /CENTER)
This will compute the average value in a 3x3 box around each pixel
(except
the edge pixels which you can set to zero or truncate or handle
separately...
whatever you please really. Who needs edges anyway, right?)

Bennett

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[Message index]

		Re: Extracting average pixel value By: jameskuyper on Fri, 24 April 2009 02:53
		Re: Extracting average pixel value By: Juggernaut on Thu, 23 April 2009 10:11
		Re: Extracting average pixel value By: Juggernaut on Thu, 23 April 2009 10:00
		Re: Extracting average pixel value By: GP on Mon, 04 May 2009 00:46

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