About match scales

[zrc]

Hello,

I am trying to learn about scale estimation of two point cloud with different scales. I found the relevent functions in cloudcompare (registration->match scales).

I'm interested in the algorithm of scale match with PCA, could you share me linked articles which you applied?

Thanks so much!

[daniel]

There's no particular article, it's pretty simple. You compute the PCA, deduce the main axis (for each cloud) and use the cloud extents along this axis to scale the cloud.

[zrc]

Thanks a lot for your in time reply! And is this scale estimation method with PCA only for those point clouds with fully overlap?

[daniel]

Well it works only if both clouds are 'complete' indeed. If you have missing parts, then the ICP and the Point-pair based alignment tools are much more robust.