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Re: Segmentation in ENVI [message #62428 is a reply to message #62422]

Wed, 10 September 2008 13:36

guillermo.castilla.ca is currently offline

guillermo.castilla.ca
Messages: 27
Registered: September 2008

Junior Member

> Any idea why the ENVI built-in doesn't work?

Well, I wouldn't say it doesn't work, it is simply intended to perform
a different task, namely to partition into homogeneous regions a grey-
level image. In your case (a classified image), you already have a
partition where each region is a set of connected pixels sharing a
common class. What you wanted to do is to single out the regions
within your classified image, which is different from what is usually
understood as 'segmentation'.

However, you are right in that the 'segmentation image' ENVI 'basic
tool' is too basic. First, it only handles one band at a time. And
second, it only produces a partial segmentation (only pixels that fall
within the entered DN range are considered). The good news is that new
ENVI Fx module tackles these deficiencies (and does way more than just
segmentation). The bad news is that you have to pay a separate fee for
it. However, there are other segmentation tools that you can get for
free in the ITTVIS codebank (e.g., my SCRM algorithm :).

Cheers

Guillermo

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[Message index]

		Re: Segmentation in ENVI By: Mort Canty on Thu, 11 September 2008 00:30
		Re: Segmentation in ENVI By: guillermo.castilla.ca on Wed, 10 September 2008 13:36
		Re: Segmentation in ENVI By: Mort Canty on Wed, 10 September 2008 11:51
		Re: Segmentation in ENVI By: guillermo.castilla.ca on Wed, 10 September 2008 09:46
		Re: Segmentation in ENVI By: Mort Canty on Wed, 10 September 2008 01:52
		Re: Segmentation in ENVI By: Tal on Tue, 09 September 2008 23:19
		Re: Segmentation in ENVI By: guillermo.castilla.ca on Thu, 11 September 2008 08:26

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