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Re: Segmentation in ENVI [message #62429 is a reply to message #62428]

Wed, 10 September 2008 11:51

Mort Canty
Messages: 134
Registered: March 2003

Senior Member

guillermo.castilla.castellano@gmail.com schrieb:
> Mort,
>
> This involves several calls to Label_Region, but perhaps is easier
> than Pal's suggestion (and will work also for a 8-neighborhood, by
> including the /all kw in the call):
>
> lmig = LABEL_REGION(climg EQ cl[0],/ULONG)
> FOR i = 1, n - 1 DO BEGIN
> mxlb = MAX(limg)
> climgi = climg EQ cl[i]
> limg = TEMPORARY(limg) + (LABEL_REGION(climgi, /ULONG) +
> climgi*maxlb)
> ENDFOR
>
> Where climg is your classified image and cl is an array of n elements
> containing the (numeric) labels of your classes. You might need to
> zero the frame of your image before doing this.
>
> Cheers
>
> Guillermo
>

Thanks, Guillermo. This is very elegant, and it's easier as you say.
Using Tal's method with /all_neighbors I was separating each class plane
in the 3D cube with an empty plane to keep the blobbing from jumping
across class boundaries. Any idea why the ENVI built-in doesn't work?

Mort

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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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