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Pixel modification after classification [message #78161]

Tue, 01 November 2011 04:30

Steffen Reich
Messages: 8
Registered: October 2011

Junior Member

Hello folks,

I programmed a decission tree with IDL and now I`m at the point that I
want to eliminate all areas of class below a specific value. For example
all areas less than 20Pixels. I want use the region_grow function to
calculate those areas and then change those pixels of the area since the
result of the region_grow function is a vector of array indices. But
perhaps I`m on a wrong or circuitous way, therefore I want to ask you
what do you think about it and if you have any hints for me.

Greeting
Steffen

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Re: Pixel modification after classification [message #78210 is a reply to message #78161]

Thu, 03 November 2011 13:08

rogass
Messages: 200
Registered: April 2008

Senior Member

On 2 Nov., 12:15, Steffen Reich <shogo...@web.de> wrote:
> Am 01.11.2011 13:21, schrieb David Fanning:
>
>
>
>
>
>
>
>> Steffen Reich writes:
>
>>> I programmed a decission tree with IDL and now I`m at the point that I
>>> want to eliminate all areas of class below a specific value. For example
>>> all areas less than 20Pixels. I want use the region_grow function to
>>> calculate those areas and then change those pixels of the area since the
>>> result of the region_grow function is a vector of array indices. But
>>> perhaps I`m on a wrong or circuitous way, therefore I want to ask you
>>> what do you think about it and if you have any hints for me.
>
>> This sounds more like a job for Label_Region, rather than
>> Region_Grow. My blob analysis tools have a feature that
>> will allow you to exclude "blobs" below a certain size
>> from further analysis.
>
>> http://www.idlcoyote.com/ip_tips/blobanalysis.html
>
>> Cheers,
>
>> David
>
> Thank you for your answer.
>
> Greeting
> Steffen

Or, just send me an email, I can give you a fast routine. Sometimes
the blob tool fails.

Cheers

CR

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Re: Pixel modification after classification [message #78307 is a reply to message #78210]

Thu, 03 November 2011 14:06

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

chris writes:

> Or, just send me an email, I can give you a fast routine. Sometimes
> the blob tool fails.

Really!? In what way?

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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