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Edge Identification

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Edge Identification

ghkraju
I have a set of unorganised pointcloud data for which i need to find out the edges. The Points belong to a single surface (Ex:- Points of a single plane). The plane is a freeform surface with 4 edges 2 edges are straight and 2 are curved. I need to identify them.

Any advices how to proceed in this case.......? Thanks in advance....:)

Regards,
Hemanth
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Re: Edge Identification

__Jan__
Hi

how about:

1) Project your cloud onto the x,y plane (you can just copy the cloud
and set z to zero)

3) calculate the 2d convex hull of the projected points (they have same
indices as you copied)

4) the indices of the hull points are the indices of your 4 edges,
extract the subcloud of those indices from your orginal cloud

5) Fit 2 times with RANSAC line detection the straight edges and remove
the inliniers from the subcloud

6) build two spatial clusters for the curved edges...

Hope that works

Cheers and happy new year

Jan



On 05/01/2017 14:54, ghkraju wrote:

> I have a set of unorganised pointcloud data for which i need to find out the
> edges. The Points belong to a single surface (Ex:- Points of a single
> plane). The plane is a freeform surface with 4 edges 2 edges are straight
> and 2 are curved. I need to identify them.
>
> Any advices how to proceed in this case.......? Thanks in advance....:)
>
> Regards,
> Hemanth
>
>
>
> --
> View this message in context: http://www.pcl-users.org/Edge-Identification-tp4043680.html
> Sent from the Point Cloud Library (PCL) Users mailing list mailing list archive at Nabble.com.
> _______________________________________________
> [hidden email] / http://pointclouds.org
> http://pointclouds.org/mailman/listinfo/pcl-users

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Re: Edge Identification

ghkraju
Thanks for the quick reply.....

That sounds great..... I will give a try and update the result in the next post.
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