[Insight-users] Binary Morphology get output with 3 values ( 0 255 -32768)

[Baoyun Li]

Dear Gaetan:

Thanks, now I SetbackgroundValue as you suggested. It works.

But SetBackgroundValue() is not defined in the itkBinaryMorophologicalErod filter.

1, Is  SetbackgroundValue given by the  base calss itkBinaryMorphologyImageFilter--itkSetMacro(BackgroundValue, OutputPixelType).

2, I do not know clearly itkSetMarco mean. Based on my understanding,

If I itkSetMacro(BackgroundValue, OutputPixelType) defined in some filter, I can used filter->SetBackgrouValue() to set the value. Is it true?


Thanks and my best regards

Baoyun




________________________________
From: Gaëtan Lehmann <gaetan.lehmann at jouy.inra.fr>
To: Baoyun Li <baoyun_li123 at yahoo.com>
Cc: ITK Users <insight-users at itk.org>; Siddharth Srivastava <siddys at gmail.com>
Sent: Friday, February 27, 2009 2:31:42 AM
Subject: Re: [Insight-users] Binary Morphology get output with 3 values ( 0 255 -32768)


Hi,

Have you set the background value, with SetBackgroundValue()?
Also, you may want to use BinaryMorphologicalClosingImageFilter¹, which already contain the code required to avoid the border effects.

Regards,

Gaëtan

¹ http://www.itk.org/Doxygen/html/classitk_1_1BinaryMorphologicalClosingImageFilter.html


Le 27 févr. 09 à 00:39, Siddharth Srivastava a écrit :

> Hi Baoyun,
>                  I think this is just a tag to represent unreachable voxels / pixels
> (something like -Inf, = -2^(16-1) in your case )
> s.
> 
> On Thu, Feb 26, 2009 at 2:31 PM, Baoyun Li <baoyun_li123 at yahoo.com> wrote:
> Dear All:
> 
> I am trying to perform some binary morphology opetration on image with int type. My input is16 bit in with value 0 and 255.
> 
> I set the binary morphology filter as suggested in the ITK example, the difference is my input and output in int 16.
> 
> When I tryied to morphology closing using Dilate and erod, I filled the hole sucessfully. But I got -32768 value for the voxel between the forgournd and background.
> 
> Can sombody tell what is wrong?
> 
> Thanks
> 
> Baoyun
> 
> 
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--Gaëtan Lehmann
Biologie du Développement et de la Reproduction
INRA de Jouy-en-Josas (France)
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