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Re: Extracting average pixel value [message #66174 is a reply to message #66171]

Thu, 23 April 2009 10:11

Juggernaut
Messages: 83
Registered: June 2008

Member

On Apr 23, 1:00 pm, Bennett <juggernau...@gmail.com> wrote:
> 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

I forgot to say also divide your resulting newArray by 8.

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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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