[Insight-users] fast binary dilate image filter

[SCHMID, Jerome]

Hi Gaetan,

Pleased to see that you've found the courage to implement the erosion version, I cannot remember if the erosion version was so straightforward.

Concerning the threading aspect of my filter I am not sure that it works 100%, probably some deeper tests should be done (if you have some time...).

Concerning you changes, I don't understand what do you mean by
"it require a larger input region to operate without border effects". The dilate version already performed this enlargement, by calling the GenerateInputRequestedRegion() function...

Of course the best implementation would be a piece of code shared by both erosion and dilation. For opening and closing I don't know now if it is so easy to implement a similar fast code. Unfortunately, currently I haven't time to take care about it.

Best Regards,

Jerome Schmid

-----------------------------------
Jerome SCHMID
Project Manager/ Engineer 
Augmented and Virtual Reality
MIS Centre
Prince of Wales Hospital
Chinese University Of Hong-Kong
-----------------------------------



-----Original Message-----
From: Gaetan Lehmann [mailto:gaetan.lehmann at jouy.inra.fr]
Sent: Mon 9/5/2005 3:18 PM
To: SCHMID, Jerome; insight-users at itk.org
Subject: Re: [Insight-users] fast binary dilate image filter
 

Hi Jerome,

I have made some changes to your filter to transform it in a fast erosion  
filter. It's great to see that there is a threaded version, but it mean  
that the work to have a fast erosion need to be done again :-(
There are only a few differences:
  + the filter dilate the background instead of the foreground
  + it require a larger input region to operate without border effects
  + it requires a background value. It is already implemented in the dilate  
version, but I can't see any case where it will be used: dilation will  
never add background pixels

Perhap's instead of changing again the code of your filter, a common class  
or template can be developed and be used by erosion and dilation ? Also,  
perhap's this common class can be used to implement more efficient opening  
and closing than just running sequencially dilation and erosion ?

Regards,

Gaetan

PS: BinaryErodeImageFilter (a modified version of  
FastIncrementalBinaryDilateImageFilter),  
BinaryMorphologicalOpeningImageFilter and  
BinaryMorphologicalClosingImageFilter are available at  
http://voxel.jouy.inra.fr/darcs/itk-mima2/Insight/Code/BasicFilters/ if  
you want to have a look at them

On Fri, 02 Sep 2005 06:27:40 +0200, SCHMID, Jerome  
<jeromeschmid at surgery.cuhk.edu.hk> wrote:

> Hi,
>
> After a long time I am back to the itk list as I find a job elsewhere.  
> Anyway this is not the topic of the mail...
>
> It concerns a filter I wrote on fast binary dilation for itk. At that  
> time ( about 1 year ago... ) I was speaking with James Miller about  
> this. Before I quit my previous job the filter hadn't been fully  
> reviewed or validated, I thought that it was lost :-)
>
> Anyway I found a thread about this filter in last April (yeah sorry to  
> talk about old things),
>
> http://public.kitware.com/pipermail/insight-users/2005-April/012583.html
>
> and I discover with pleasure that the filter has been integrated by  
> James. However James wonder if I made some modifications to it since.  
> The answer is no as I haven't access now to my previous work.
>
> However I wonder if James tried to test the threadable aspect of the  
> filter that I implemented at that time. The last version of the filter I  
> submited should be in the old following thread:
>
> http://public.kitware.com/pipermail/insight-users/2004-September/010538.html
>
> Our concern was the safety of some operations. At that time I tested it  
> and it seemed to work. The current implementation  
> itk::FastIncrementalBinaryDilateImageFilter hasn't the threadable aspect  
> available.
>
> I hope I can find the time one day to have a deeper look on it.
>
> Best Regards,
>
> Jerome Schmid
>
> _______________________________________________
> Insight-users mailing list
> Insight-users at itk.org
> http://www.itk.org/mailman/listinfo/insight-users



-- 
Gaetan Lehmann <gaetan.lehmann at jouy.inra.fr>
Tel: +33 1 34 65 29 66
Biologie du Développement et de la Reproduction
INRA de Jouy-en-Josas (France)
Web: http://voxel.jouy.inra.fr