Hi Jérôme,<br><br>How could calculate the gradient of a binary image with vtk?<br><br>Regards,<br>Paulo Amorim<br><br><br><br><br><br><div class="gmail_quote">On 12 March 2011 13:55, Jérôme <span dir="ltr"><<a href="mailto:jerome.velut@gmail.com">jerome.velut@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi Sara,<br>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.<br>
<br>Note, they are a lot of other solutions, but these one may be implemented thanks to native VTK filters. <br><br>HTH,<br>Jerome<br><br><br><div class="gmail_quote"><div><div></div><div class="h5">2011/3/12 Sara Rolfe <span dir="ltr"><<a href="mailto:smrolfe@u.washington.edu" target="_blank">smrolfe@u.washington.edu</a>></span><br>
</div></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div><div></div><div class="h5"><div style="word-wrap: break-word;"><div>Hello,</div>
<div><br></div><div>I have a vtkPolydata contour that I'd like to convert into image data. This is similar to the example here:</div>
<div><h1><span style="font-weight: normal;"><font size="3"><span style="font-size: 12px;">VTK/Examples/Cxx/PolyData/PolyDataContourToImageData</span></font></span></h1></div><div>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. </div>
<div><br></div><div>Please let me know if you have any ideas on the optimal method to solve this problem.</div><div><br></div><div>Thanks,</div><div>Sara</div><font color="#888888"><div><br></div><br></font></div><br></div>
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