New method for edges and contours extraction

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New method for edges and contours extraction

Troth45
Hi!
Using the PCA (principal component analysis) we have that in correspondence of a contour or an edge of an object, the largest eigenvalue is a value greater than 2/3 (about 66%) of the normalized propagation of the points.
Therefore, filtering the points with a low principal eigenvalue the cloud preserves most of the borders of a shape.
The results are shown in these two links:
http://pointclouds.org/blog/_images/1.jpg
http://pointclouds.org/blog/_images/2.jpg

I already opened an issue in dev (http://dev.pointclouds.org/issues/665) and I'm qaiting for feedbacks.

Mattia
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Re: New method for edges and contours extraction

Radu B. Rusu-3
Administrator
I'm confident that Suat would be interested in this as well, as he was working on similar things for his Harris keypoint
detector. I added him to the issue on dev.

Cheers,
Radu.

On 04/18/2012 01:22 AM, Troth45 wrote:

> Hi!
> Using the PCA (principal component analysis) we have that in correspondence
> of a contour or an edge of an object, the largest eigenvalue is a value
> greater than 2/3 (about 66%) of the normalized propagation of the points.
> Therefore, filtering the points with a low principal eigenvalue the cloud
> preserves most of the borders of a shape.
> The results are shown in these two links:
> http://pointclouds.org/blog/_images/1.jpg
> http://pointclouds.org/blog/_images/2.jpg
>
> I already opened an issue in dev (http://dev.pointclouds.org/issues/665) and
> I'm qaiting for feedbacks.
>
> Mattia
>
> --
> View this message in context: http://www.pcl-developers.org/New-method-for-edges-and-contours-extraction-tp5648537p5648537.html
> Sent from the Point Cloud Library (PCL) Developers mailing list archive at Nabble.com.
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> PCL-developers mailing list
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Re: New method for edges and contours extraction

fistazz.mixwell
This post has NOT been accepted by the mailing list yet.
Hi guys could please anyone share the code used to get edges using PCA and a step by step instruction if its a complicated method to get the edges. The results are amazing.
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Re: New method for edges and contours extraction

kangxinghuo
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In reply to this post by Radu B. Rusu-3
Hi ,could you share code ?? 769301336@qq.com Thanks
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Re: New method for edges and contours extraction

kangxinghuo
This post has NOT been accepted by the mailing list yet.
In reply to this post by Troth45
Hi, "http://dev.pointclouds.org/issues/665" why i can not open it ??