[vtkusers] Find closest point

[Jothy]

Have you tried vtkWindowedSincPolyDataFilter


Jothy

On Mon, Sep 19, 2011 at 11:08 AM, nuno.jf <nunofernandes7 at gmail.com> wrote:

> I vtkCleanPolyData doesn't do what I need. vtkCleanPolyData down-samples my
> entire set of points, merging duplicate points, removing unused points and
> so on... The problem is that the noise (circled) remains, and the
> proportion
> between the noisy points and the wanted points is maintained, as one can
> see
> bellow.
>
> http://vtk.1045678.n5.nabble.com/file/n4818404/cleanpolydata.png
>
> I believe the filter available in PCL does exactly what its needed in my
> case. I think it should not be very hard to implement, as I only need to,
> for each point P, calculate the mean distance from it to some k nearest
> points. I then get a medium distance and I can calculate the standard
> deviation. I then traverse all the P points again and I remove those whose
> mean distance is greater than one standard deviation. (I think... ) My
> major
> question is that, if the filter calculates mean distances for each point P
> it can take too long to run. My biggest point cloud has 123k points. I
> think
> I can select only a set of points inside my entire dataset, like the
> landmarks in ICP. But I don't know how to select points that represent each
> important region in my dataset. Any idea how I can do it?
> Nuno
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> --
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-- 
Jothybasu K Selvaraj
PhD Student
University of Liverpool
Liverpool,UK
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