Calibration methodology issue

Jonathan Barsotti

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Mar 24, 2025, 12:17:19 PMMar 24

to multi-camera software from the Straw Lab

I setup a 4-camera system for multitrack acquisition of small flying insects in confined environment (climatic chamber).

From the official Braid documentation I did not find any reference to an end-to-end methodology for multicamera system calibration.

I already tried the MCSC methodology obtained low-accuracy results. Is there any well documented end-to-end procedure to follow to calibrate a 4-camera system?

Thank you.

Jonathan

Andrew Straw

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Mar 24, 2025, 12:21:27 PMMar 24

to Jonathan Barsotti, multi-camera software from the Straw Lab

Dear Jonathan,

We are finalizing a new release, a revision to the documentation, and a protocol manuscript which uses an April Tag based calibration method. This is more robust than the MCSC and the results can be validated step-by-step. Unfortunately myself and my postdoc are both at conferences this week and thus not much progress can be expected until next week at the earliest. If you can wait a bit, that would be my suggestion.

Best,

Andrew

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Elhanan Buchsbaum

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Oct 21, 2025, 10:05:51 AMOct 21

to multi-camera software from the Straw Lab

Hi Andrew, I hope you're doing well.

I had a quick question that is related to the AprilTag calibration. I thought it might be more useful to place it here rather than open a new topic.

So far we've been using the old MCSC system for calibration, and it was working well. Recently I did a redesign of our experimental setup, and I decided to try and use the AprilTag calibration.

I had a question regarding the first step - where do you actually get the data for `apriltags_coordinates.csv` (the April Tags 3D fiducial coordinates)? I understand this is the relative position of each AprilTag for each of the two AprilTag calibration pages (i.e., z0, z1), but how is this generated?