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DAVID-Laserscanner Forum • View topic - Tsai/Matlab format of Calibration Files
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Tsai/Matlab format of Calibration Files

Problems, solutions and discussion about scanning with a video projector and stripe patterns.

Tsai/Matlab format of Calibration Files

Postby Booley » Wed Jun 25, 2014 4:13 pm

Booley
 
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Re: Tsai/Matlab format of Calibration Files

Postby Booley » Wed Jun 25, 2014 5:22 pm

Ah I'm sorry for the double post but I couldn't find the edit button...

I noticed that in the Advanced Settings section in DAVID there is an option to set the Projector Calibration model: two options are TS11 and MA16 (I may have the numbers wrong). Do these correspond to Tsai and Matlab, or just coincidences? If they do relate, then why is there no such option for the camera?
Booley
 
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Joined: Tue Jun 24, 2014 8:26 pm

Re: Tsai/Matlab format of Calibration Files

Postby Sven » Fri Jun 27, 2014 10:28 am

Hi Booley,

The difference between TS11 and MA16 are non-linear lens distortion parameters. They have different advantages and disadvantages.
For projectors, often MA16 is slightly better, but sometime, depending on model and setup, MA16 is very imprecise, causing distorted scans. So in general we recommend TS11 (default setting).
Please understand that I can't go much into detail here.

About N, O, A, P:
You are right about the meaning of these vectors.
You can interpret them as a 4x4 homogeneous transformation matrix (add bottom row "w", always: 0 0 0 1) which represents the position and orientation of the camera/projector. N,O,A can also be interpreted as a 3x3 rotation matrix.
These matrices can be converted to other representations of rotation, like RPY angles...

Sven
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