[Insight-users] how to extract boundarys from binary image?

[Luis Ibanez]

Hi Yu,

The filter that performs the operation  ImageA - ImageB is
the SubtractImageFilter:

http://www.itk.org/Insight/Doxygen/html/classitk_1_1SubtractImageFilter.html

Note the in your particular case, since you are using binary
images you could also use the XOR image filter

http://www.itk.org/Insight/Doxygen/html/classitk_1_1XorImageFilter.html

When you look for particular filter in ITK you should look at the
alphabetical list of classes

    http://www.itk.org/Insight/Doxygen/html/classes.html

and to the grouped list of classes.

    http://www.itk.org/Insight/Doxygen/html/modules.html



Regards,


   Luis


----------------------
Yu Long wrote:

> Thanks.
> Which filter is used for the operation of  (imageA-imageB)?
> It's hard for me to find out this filter.
> 
>     ----- Original Message -----
>     *From:* salah <mailto:salah at gris.uni-tuebingen.de>
>     *To:* Yu Long <mailto:yulong202 at 263.net>
>     *Sent:* Thursday, July 08, 2004 6:03 PM
>     *Subject:* AW: [Insight-users] how to extract boundarys from binary
>     image?
> 
>     as for the first question, Yes. just use for the erosion filter a
>     structuring element with radius=1 in each direction.
>      
>     I do know an answer for the second one. if you found something,
>     please let me know.
>      
>     regards,
>     Zein
>      
> 
>         -----Ursprüngliche Nachricht-----
>         *Von:* Yu Long [mailto:yulong202 at 263.net]
>         *Gesendet:* Thursday, July 08, 2004 11:59 AM
>         *An:* salah
>         *Cc:* insight-users at itk.org
>         *Betreff:* Re: [Insight-users] how to extract boundarys from
>         binary image?
> 
>             Thanks for your reply.I will try your method.I still have
>         two questions.
>           1 Can your method produce */one/* */pixel width/* boundary? 
>          
>           2 Is there any filter used to trace the boundary pixels one by
>         one? So that I can convert the boundary pixels to contour points.
>          
> 
>             ----- Original Message -----
>             *From:* salah <mailto:salah at gris.uni-tuebingen.de>
>             *To:* Yu Long <mailto:yulong202 at 263.net>
>             *Sent:* Thursday, July 08, 2004 5:37 PM
>             *Subject:* AW: [Insight-users] how to extract boundarys from
>             binary image?
> 
>             If you want to produce a binary image containing on the
>             boundary, I would suggest:
>             1- let your binary image be   "A"
>             2- erode the image "A" by itk erosion filter, name the
>             result "B"
>              
>             The boundary image is A - B
>              
>             best wishes,
>             Zein
>              
>              
> 
>                 -----Ursprüngliche Nachricht-----
>                 *Von:* Yu Long [mailto:yulong202 at 263.net]
>                 *Gesendet:* Thursday, July 08, 2004 11:33 AM
>                 *An:* insight-users at itk.org
>                 *Betreff:* [Insight-users] how to extract boundarys from
>                 binary image?
> 
> 
>                     I have now written a program to convert a RGB image
>                 into a binary image using itk. A sample binary image is
>                 attached with this email.
>                     My question is how to extract the boundary from the
>                 binary image with itk? Is there any filter or algorithm
>                 than can extract boundarys from binary image in itk?
>                  
>                  
>                  
>                  
>                 HuaZhong Univ. of Sci. & Tech, China
>                 email: yulong202 at 263.net <mailto:yulong202 at 263.net>
> 
> 
> ------------------------------------------------------------------------
> 
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