| Re: ENVI: Filter ROI's [message #15836] |
Wed, 16 June 1999 00:00 |
David Foster
Messages: 341
Registered: January 1996
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Senior Member |
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Caroline Ward wrote:
>
> Hello,
>
> I have a series of DEMS generated from SAR stereo pairs which need a few
> edits. I would be interested if anyone can tell me how to filter an ROI
> rather than a whole image or sub-scene.
>
> Regards
>
> Caroline Ward
Caroline -
When I need to do something like this I usually make a copy of the
data, filter it, and then update only the ROI portion of the original
data with the filtered data. It is possible to filter subregions,
but it is problematic in that this often results in aliasing effects
at the edges of the ROI.
Dave Foster
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
David S. Foster Univ. of California, San Diego
Programmer/Analyst Brain Image Analysis Laboratory
foster@bial1.ucsd.edu Department of Psychiatry
(619) 622-5892 8950 Via La Jolla Drive, Suite 2240
La Jolla, CA 92037
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