[vtkusers] Clipping image data with polygon data.

[David Gobbi]

Please provide a few lines of code, so that I can get an idea about
what might be going wrong.

   David


On Sun, Jan 17, 2010 at 9:55 PM, superzz <jxdw_zlf at yahoo.com.cn> wrote:
>
> Hello David Gobbi
> Thank you for your response.
> The example works fine. I can see the result in ImageViewer. I want to
> export stencil image to raw file now. However, if I call
> imageStencil.Update() manually, Update() never returns. Why this happens?
>
> Thanks
>
> superZZ
>
>
> David Gobbi-3 wrote:
>>
>> Hi SuperZZ,
>>
>> One way that I've done this is with vtkImplicitSelectionLoop, which is
>> a vtkImplicitFunction that takes a vtkPoints list that defines a
>> polygon.  Then vtkImplicitFunctionToImageStencil can create an image
>> stencil, and vtkImageStencil can apply the stencil to the image and
>> black out everything outside the polygon.
>>
>> There are two simple testing examples for stenciling images (both of
>> these examples are for 3D images and 3D selection regions, though):
>> VTK/Imaging/Testing/Tcl/TestStencilWithFunction.tcl
>> VTK/Hybrid/Testing/Tcl/TestImageStencilWithPolydata.tcl
>>
>> It's probably also possible to use vtkProbeFilter to create a "mask"
>> image from your polygon.
>>
>>    David
>>
>>
>> On Fri, Jan 15, 2010 at 2:46 AM, superzz <jxdw_zlf at yahoo.com.cn> wrote:
>>>
>>> Hello
>>> I wanna know does VTK support clipping image data with specified polygon
>>> data.
>>>
>>> I am developping a segmentation program. What I want to implement is,
>>> first
>>> user pick some connected polygons, then the program keeps the regions of
>>> image data covered by picked polygons. Erase other regions of image data
>>> to
>>> black.
>>>
>>> Thanks!
>>>
>>> superZZ
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>
> --
> View this message in context: http://old.nabble.com/Clipping-image-data-with-polygon-data.-tp27173364p27206195.html
> Sent from the VTK - Users mailing list archive at Nabble.com.
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