[Insight-users] Segmentation question

[µ/*CT*/ser]

Hi

Maybe i´m late and/or this may not serve you, but anyway i´m gonna suggest
you to invert the pixel values in order to get the pixels of low value
segmented as if they were of high value.


	OtsuThresholdImageFilterType::Pointer    otsuFilter    =
OtsuThresholdImageFilterType::New();

	otsuFilter->SetInsideValue(255);
	otsuFilter->SetOutsideValue(0);

kind regards.


devil20 wrote:
> 
> Hi
> 
> I tried already with otsu method but it gives me outer region of object
> because there is large area of white pixels and only small area of this
> black defects.
> 
> Any suggestion for the change in otsu method to ignore white area ?
> 
> Alex
> 
>  
> 
> From: Sergio Vera 
> Sent: Tuesday, January 10, 2012 7:02 PM
> To: alex Dowson 
> Cc: itk ; Luis Ibanez 
> Subject: Re: [Insight-users] Segmentation question
> 
> Look for otsu method. 
> http://www.itk.org/Doxygen/html/classitk_1_1OtsuThresholdImageFilter.html  
> or its cousin
> http://www.itk.org/Doxygen/html/classitk_1_1OtsuMultipleThresholdsCalculator.html 
> 
> It should be pretty straightforward, looking at that image.
> 
> Best regards
> 
> 
> On Tue, Jan 10, 2012 at 1:49 PM, alex Dowson <alexdowson at hotmail.com>
> wrote:
> 
>   Hi
> 
>   I am doing MicroCT application using ITK.  I want detecting defects in
> material with automatic threshold. Please check attached image that I
> shown two defects in materials.
> 
>   My question is using which filters I can detect this defects ?  I tried
> with LabelImage but it need threshold as input. I want to do automatic
> segmentation of this defects.
> 
> 
>   Any help will be appreciated ...
> 
> 
>   Alex
> 
> 
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> 
> 
> 
> -- 
> Sergio Vera
> 
> Alma IT Systems
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> 
> _____________________________________
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> 
> Visit other Kitware open-source projects at
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> 
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> http://www.kitware.com/products/protraining.html
> 
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