[Insight-users] areaOpeningImageFilter difficulties

[Conrad Bielski]

Hi Gaetan,my first test I just used a value of 250 (lambda) and I presume it was pixels. The output looked correct without too much testing/comparing with other results. When you say that it can work with physical units, you mean that 250 could be a volume (say in L) if you knew that a single pixel = 100mL?For number of pixels, if the type is the default and there is overflow, will I get a message? I presume that I need a larger type if I'm looking for many small areas in a large image, correct?Thanks for your help guys, I really appreciate it.Conrad :)

--- On Wed, 6/17/09, Gaëtan Lehmann <gaetan.lehmann at jouy.inra.fr> wrote:

From: Gaëtan Lehmann <gaetan.lehmann at jouy.inra.fr>
Subject: Re: [Insight-users] areaOpeningImageFilter difficulties
To: "Conrad Bielski" <conrad_bielski at yahoo.com>
Cc: "Luis Ibanez" <luis.ibanez at kitware.com>, insight-users at itk.org, Richard.Beare at ieee.org
Date: Wednesday, June 17, 2009, 10:25 AM


Hi,

You won't find that parameter in Richard's original paper. That's a parameter I have added to make the area opening filter able to work with a component object size in pixels or in physical unit with a high precision. When using a number of pixels, you may prefer to used the type unsigned long.
Most of the time, the default type should be fine though.

Gaëtan


Le 17 juin 09 à 14:45, Conrad Bielski a écrit :

> Dear Luis,
> thanks for that. I actually did find the test code and got it working from there (at least the lambda). I'm actually using OTB and got that hint from their maintainers. I will certainly look at the Journal papers as well in order to know exactly what is going on.
> Keep up the great work!
> Conrad :)
> 
> --- On Wed, 6/17/09, Luis Ibanez <luis.ibanez at kitware.com> wrote:
> 
> From: Luis Ibanez <luis.ibanez at kitware.com>
> Subject: Re: [Insight-users] areaOpeningImageFilter difficulties
> To: "Conrad Bielski" <conrad_bielski at yahoo.com>
> Cc: insight-users at itk.org, Richard.Beare at ieee.org, "Gaëtan Lehmann" <gaetan.lehmann at jouy.inra.fr>
> Date: Wednesday, June 17, 2009, 4:40 AM
> 
> Hi Conrad,
> 
> You may want to read the description of this filter in
> the Insight Journal paper:
> 
>     http://hdl.handle.net/1926/1316
> http://www.insight-journal.org/browse/publication/203
> 
> and start from the code of the test:
> 
> Insight/Testing/Code/Review/
>        itkAreaOpeningImageFilterTest.cxx
> 
> 
> It seems that you will be safe by using the default
> value for the third template parameter "TAttribute".
> It is used as the type for the components of the
> image spacing.
> 
> 
>      Regards,
> 
> 
> 
>            Luis
> 
> 
> 
> ----------------------------------------
> On Tue, Jun 16, 2009 at 11:20 AM, Conrad Bielski <conrad_bielski at yahoo.com> wrote:
> Hi,
> I wanted to test the itk::areaOpeningImageFilter but I am unsure of how to specify the TAttribute for this filter. I can't seem to find the documentation for this class.
> 
> If anybody has some example code that uses this filter and is willing to share or could explain what I need to do I would be very grateful.
> Thanks in advance and have a great day,
> Conrad :)
> 
> 
> 
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--Gaëtan Lehmann
Biologie du Développement et de la Reproduction
INRA de Jouy-en-Josas (France)
tel: +33 1 34 65 29 66    fax: 01 34 65 29 09
http://voxel.jouy.inra.fr  http://www.itk.org
http://www.mandriva.org  http://www.bepo.fr




      
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