Manual scaling and computation of segment scaling factors

[Vincent Tate]

Hi everyone,
I'm currently working on an inverse kinematics project with the skeletal version of the Rajagopal2015 model and do not have access to marker tracking for the purposes of scaling. I understand that I can manually input scale factors through the scaling tool. However, in order to manually compute the scale factors, I'm under the assumption that I need to know the generic Rajagopal model's segment lengths, which are seemingly not included in the model's xml or the paper detailing the Rajagopal2015 model. Without the original segment lengths, is it still possible to manually create scale factors? If not, can the whole model scale factor be roughly estimated using just the generic model's height and the experimental subject's height?

Thanks!
Vincent

[Nastaran Taefi Aghdam]

Dear Vincent,

I am useing manual scaling, too. For the model's segment lengths, I put markers on the model in a same parent frame and calculated the marker distances.

I hope you find it helpful.

Best regards
Nastaran

[jing liu]

What I understand is to calculate the distance between the two marks in the same set of marks as the segment length to calculate the scaling factor, right?

[Nastaran Taefi Aghdam]

Deaar Jing,
yes, and the markers must be in a same frame.

Kind regards,
Nastaran

[jing liu]

Dear Nastaran,
Why does it have to be in the same frame, isn't the segment length fixed?