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Re: Difficult Label_region question [message #60058 is a reply to message #59980]

Fri, 25 April 2008 00:09

Gaurav
Messages: 50
Registered: January 2007

Member

>> I want to use the label_region
>> in order the imnew to contain three segments. The first segment
>> contains pixels from the first channel, the second segment contain
>> pixels from the second channel, and the third segment contains pixels
>> from the third channel.

Even in that case, LABEL_REGION is not the function to use.
LABEL_REGION is used in a binary image when there are sompe pixels
clumped togetther. Suppose you had a binary satellite image in which
all the water bodies where colored with the value 255 while all rest
was 0. If there were 5 separate waterbodies, you could use
LABEL_REGION to identify the number of waterbodies, number them and to
find the pixels belonging to each waterbody. Ergo, WHERE would still
be the function that would come into use for you.

You should use WHERE function with the INDICES keyword to get the
locations that satisfy your value, something like
index_blue = WHERE(BLUE GT GREEN AND BLUE GT RED)
where BLUE GREEN and RED contain the three bands of your data.

Similarly you can get the elements for index_green and index_red.
These three variables will contain the "segments" you are looking for
and you can process them together.

Hope it helps...

Gaurav

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[Message index]

		Re: Difficult Label_region question By: moxament on Thu, 24 April 2008 05:32
		Re: Difficult Label_region question By: Gaurav on Thu, 24 April 2008 01:33
		Re: Difficult Label_region question By: Gaurav on Wed, 23 April 2008 23:11
		Re: Difficult Label_region question By: Jonathan Dursi on Wed, 23 April 2008 21:33
		Re: Difficult Label_region question By: Gaurav on Fri, 25 April 2008 00:09
		Re: Difficult Label_region question By: Michael Galloy on Thu, 24 April 2008 10:55

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