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[Seg3D] Re: Interpreting the result of the Point Set Registration

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  • From: Ayla Khan <>
  • To:
  • Subject: [Seg3D] Re: Interpreting the result of the Point Set Registration
  • Date: Thu, 19 Dec 2013 22:05:03 -0700

Hi Sergio,

I attempted to reproduce your problem with a very simple tooth dataset, and also increasing the iterations. The translation parameters in X is approximately -8. The Y parameter gets reasonably close to 0. Z is a bit larger, but still fairly close to 0.

Can you send me your project, or give me more information about the data you were working with?



On Dec 19, 2013, at 5:24 AM, Sergio Vera wrote:

Dear Seg3D2 staff

I have a binary mask loaded in Seg3D2. With the Transform operator, I generate a copy of that same image but I change its origin to be +8 units in the X axis.

So I have a mask and the same mask but displaced in the X axis.

If I apply the Point set registration algorithm to these masks, after 30 iterations I obtain a new mask that is close to the target mask, but the translation parameters that appear on the ITK interface are very confusing. 

I would expect to obtain a translation in X close to 8 (or -8) and Y and Z translation to be near 0.
Instead I obtain translations on X, Y and Z between 0.5 and 0.9. However, the newly generated mask is really close to the target mask.

Is there a problem with the transformation values? I'm interpreting the results wrongly?

Many thanks

Sergio Vera

 Alma IT Systems
 C/ Vilana, 4B, 4º 1ª
 08022 Barcelona
 T. (+34) 932 380 592

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