[vtkusers] Interpolation between two contours

[David Gobbi]

Hi Markus,

Converting the contours to binary images as part of your solution will
really increase the computational cost, so I would suggest not taking
that approach.

You should try parameterizing the contours with splines (two splines
per contour, one for x vs. t and one for y vs. t, where t is the
parameter).  The parameter can either be the fractional distance
around the contour, or it can be an angle using the center of the
contour as a reference point.  Then, to interpolate, do a for-loop
where you take small steps in t (the parameter value) and compute
the (x,y) points for each of the two contours. Interpolate between
these (x,y) points to create your interpolated contour.

 - David


On Sat, Jun 25, 2011 at 7:46 PM, Markus <vishapxtreme at googlemail.com> wrote:
> Hi all,
>
> I am pretty new to the VTK and I got the assignment to interpolate between
> two contours. What I have done so far is converting the contours to an
> binary image (area inside 0, outside 1) and computed an
> vtkEuclideanDistance.
>
> The missing step is the interpolation between contour one and two, of which
> I both have a binary image and a distance map computed, but I am missing the
> final step to the interpolation.
>
> I took a look at vtkTemporalDataSet, but I am stuck how to use it.
> vtkTemporalInterpolator seems to be a good match for what I want to do (I
> want to be able to set the number of frames in between the images and then
> get the interpolated image for frame x), but I did not understand how to use
> those for my purpose from the examples at
> http://www.vtk.org/Wiki/VTK/Time_Support
>
> I would appreciate your help on how to solve this,
> thanks
>
> Markus
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