[vtkusers] Convert to binary image

Thu May 3 11:10:13 EDT 2012

Hi Gonzo.

I think that I got your problem.
I would go with an iterator from the target point to your sulci pixels.
If the iterator get a value which is representing a sulci's value (some
gray value) - I'd mark this in another image.
finally you'll get an image which represents the surface between the sulci
to your target.

hope that I understood you properly.
anyway,
you must learn itk and iterators to do that. if you are familiar with c++
and image processing-
you won't have a problem to learn this.

BTW,
please write me in a private email what are you working on, maybe I can
help you.

Good luck.
Hila

On Thu, May 3, 2012 at 4:26 PM, Gonzalo Amadio <gonzaloama at yahoo.com.ar>wrote:

> First of all, thank you, and sorry for this long mail. But I will be very
> grateful if someone can help me here =D ..
>
> I am working on a medical software. I have the skin as a mesh
> (vtkPolyData), and a target inside the head. I have some obstacles (like
> sulci) represented as a mitk::image.
> What I want to do is to get out some cells of the vtkPolyData (the skin).
> Those who "are not visible" from the the target (because some obstacle is
> in the midle of the ray with origin on the target and end on the cell).
> But working this obstacles as Images take too long. That is why I want to
> convert them to vtkPolyData. Because for each cell, I have to compute a
> lots of rays (for each point of the image), and see if the ray goes through
> an obstacle or not. And with poly data I think is much faster. Is it? or
> maybe some other idea.
>
> I read what you tell me about converting the image, but I just starting
> with this, and not have much experience with  vtk, itk, mitk.
> So, really sorry for bothering, but I don't know what I have to use to
> conver the image to binary. And also I am not working with the mitk's Gui.
> I only have the image in my program.
>
> Again, really really thank u a lot!
>
> Gonzalo.
>
>
> 2012/5/3 Hila Hiler <hilahiler at gmail.com>
>
>> Gonzalo,
>> I read your q again.
>>
>> In order to get a vtkPolyData from mitk::Image you have to do the
>> following steps:
>> 1. only binary images can be converted into a polyData. so convert your
>> mitk::image to binary image first.
>> 2. by mitk's Gui: right click on your binaryImage->get Mesh / polyData
>>
>> Good luck.
>>
>>
>> On Thu, May 3, 2012 at 1:06 PM, Hila Hiler <hilahiler at gmail.com> wrote:
>>
>>> Gonzalo,
>>> I use Mitk.
>>> I don't understand how you want to run a vtkFilter on mitk::Image. why?
>>> a vtkFilter you can run on mitk::Surface or
>>> mitk::Surface->getVtkPolyData();
>>>
>>> if you have an itk::Image and you want to do a segmentation such that
>>> only positive values will be in that seg, you can use iterator as David
>>> suggested or you can use the GUI of mitk:
>>> right click on the image that u loaded->set threshold value to zero->
>>> and you will get a segmented image.
>>>
>>> Hope I helped.
>>>
>>>
>>>
>>> On Thu, May 3, 2012 at 11:35 AM, Gonzalo Amadio <gonzaloama at yahoo.com.ar
>>> > wrote:
>>>
>>>> Sorry for writing again..
>>>> I read that MITK is like an extension of VTK and ITK.
>>>> I have my Image in mitk::Image . And this is a VTK filter. And as input
>>>> have a VTKimageData. Can I mix things like that?
>>>>
>>>> Again thank u very much!
>>>>
>>>>
>>>> 2012/5/3 Gonzalo Amadio <gonzaloama at yahoo.com.ar>
>>>>
>>>>> Maybe, I am going to read about it..
>>>>>
>>>>> Do you know if there is an example for using that class? .. Because it
>>>>> is difficult with only the Doc for me ... =(
>>>>>
>>>>> But I will try something..
>>>>>
>>>>> Thank u very much!
>>>>> Gonzalo.
>>>>>
>>>>> 2012/5/3 Li, Wen <wen-li at uiowa.edu>
>>>>>
>>>>>  Gonzalo,
>>>>>>
>>>>>>  Maybe the vtkImageMarchingCubes can help?
>>>>>>
>>>>>>  Wen
>>>>>>
>>>>>>  On May 2, 2012, at 3:51 AM, Gonzalo Amadio wrote:
>>>>>>
>>>>>> Sorry for the late response..
>>>>>> Yes, I want to generate a surface. I am working with 3D meshes, using
>>>>>> polyData. And I have an Image. But when working with this, it is not
>>>>>> working properly.
>>>>>> So I want to convert this image into a polyData, because it is easier
>>>>>> to make traversal, comparisons and other things.
>>>>>> If you have any ideas I will be very grateful.
>>>>>>
>>>>>>  Gonzalo
>>>>>>
>>>>>> 2012/4/27 Li, Wen <wen-li at uiowa.edu>
>>>>>>
>>>>>>> I am not sure how can you do the converting. are you going to
>>>>>>> generate a surface out of it?
>>>>>>>
>>>>>>> Wen
>>>>>>>
>>>>>>> On Apr 26, 2012, at 5:53 PM, gonza8888 wrote:
>>>>>>>
>>>>>>> > Sorry for responsing here. But as long as you are working with
>>>>>>> image and
>>>>>>> > polydata.
>>>>>>> > Do you know how I can convert an image into polydata ( a 3D
>>>>>>> triangle mesh) ,
>>>>>>> > the image if i am not wrong is an mitk::image.
>>>>>>> >
>>>>>>> > Thank u for the help! =)
>>>>>>> >
>>>>>>> > --
>>>>>>> > View this message in context:
>>>>>>> http://vtk.1045678.n5.nabble.com/Convert-to-binary-image-tp5668642p5668859.html
>>>>>>> > Sent from the VTK - Users mailing list archive at Nabble.com.
>>>>>>> > _______________________________________________
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>>>>>>>
>>>>>>
>>>>>>
>>>>>>  --
>>>>>> --------
>>>>>> Gonzalo Amadio
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>
>>>> _______________________________________________
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>>
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