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Last Post 14 Nov 2008 06:29 AM by  anon
How can a MASK file be used with a Convolution Filter?
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anon



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14 Nov 2008 06:29 AM
    I have lots of files with many null values (zero in this instance). I need to use Convolution Filters (High and Low Pass) on these files to reveal certain features, but the zeros severely bias the filtering. I can easy create a Mask file for the zero pixels, but how can I use this with the filters?   Many thanks in advance.

    MariM



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    14 Nov 2008 11:03 AM
    Unfortunately, ENVI's filter tools do not allow for the use of a mask.  It seems you would have to write some code in IDL to exclude the undesired pixels when evaluating the values under your filter. 
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