Dear Luca,
I do resample and smooth according to your instruction. The result is
perfect now.
Thank you very much.
Best Regards,
Jerry
On Thu, Dec 22, 2011 at 4:56 PM, Luca Antiga <[email protected]> wrote:
> Hi Jerry,
> due to small-scale noise, the orientation of the tangent to a centerline
> can
> be quite erratic compared to what one expects by looking at the same
> centerline
> at a distance.
> More so, centerlines might be irregularly sampled, and you might find
> yourself
> taking finite differences on nearly-coincident points, and this is what I
> think is
> happening in your case.
>
> The solution needs two steps: resample centerlines and smooth them. Here's
> how you do it:
>
> vmtkcenterlineresampling -ifile centerlines.vtp -length 1.0 --pipe
> vmtkcenterlinesmoothing -iterations 100 -ofile centerlines_rs_sm.vtp
>
> where
> -length is the length of the output line segments or, if you prefer, the
> distance between
> samples in the resampled centerline;
>
> - iterations controls how much smoothing you're imposing on the
> centerlines.
>
> Note that just the resampling might actually be sufficient, without the
> smoothing,
> just play with it and see what happens.
>
> Best regards
>
> Luca
>
>
> On Dec 22, 2011, at 3:49 AM, Lingfeng Zhuang wrote:
>
> > Hi,
> >
> > I am using centerline generated by vmtk as the path of camera in my
> Airway Endoscopy program.
> >
> > centerline[n] as camera position, centerline[n+1] as focal position. I
> meet a problem, the camera direction sometimes has a great change when
> moving from point n to point n+1.
> >
> > In those cases, it is likely that, at point n, use can see next airway
> hole nearby. But at point n + 1, use can only see the airway way due to big
> direction change.
> >
> > Any advice will be appreciated.
> >
> > Best regards,
> >
> > Jerry
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