[vtkusers] vtkPolydata contour to image

[Paulo Henrique Junqueira Amorim]

Hi Jérôme,

How could calculate the gradient of a binary image with vtk?

Regards,
Paulo Amorim





On 12 March 2011 13:55, Jérôme <jerome.velut at gmail.com> wrote:

> Hi Sara,
> In my mind, theproblem is that your polydata sampling does not match the
> image sampling. If you managed to get a filled binary volume from your
> polydata surface, then you can try to compute the gradient of this image.
> Another solution is to substract the binary volume from a dilated version of
> the binary volume: the output will contain only the contour voxels.
>
> Note, they are a lot of other solutions, but these one may be implemented
> thanks to native VTK filters.
>
> HTH,
> Jerome
>
>
> 2011/3/12 Sara Rolfe <smrolfe at u.washington.edu>
>
>> Hello,
>>
>> I have a vtkPolydata contour that I'd like to convert into image data.
>>  This is similar to the example here:
>> VTK/Examples/Cxx/PolyData/PolyDataContourToImageData
>> except that I don't want the image contour to be filled.  I thought that I
>> could get around this by using polyData->GetPoints, iterating through the
>> point list, converting to an ITK image index, and assigning the image data
>> value.  However, I get the ridge artifact shown in the image I've attached.
>>
>>
>> Please let me know if you have any ideas on the optimal method to solve
>> this problem.
>>
>> Thanks,
>> Sara
>>
>>
>>
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