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strawlab / nextgen-camera-users

next generation camera software from the Straw Lab
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checkerboard calibration questions #3

Closed astraw closed 4 years ago

astraw commented 4 years ago

From a user

I'm working on getting the checkerboard calibration working, and have some questions.. hopefully you can help.

Basically, my questions are:

  1. What is the correct process for performing the calibration?
  2. Where are the files saved?
  3. What do I need to do to integrate the checkerboard calibrations into the multicamselfcal routine etc.

These questions arose from me playing around with the checkerboard calibrator in braid.. when I run braid, end click enable checkerboard calibration for a given camera, I can get it to find my checkerboards, and it shows a steadily increasing number of checkerboards collected. When I click perform and save calibration I don't see any information about where that file may have gone. And when I click to stop checkerboard calibration, the checkbox immediately becomes clicked again. Perhaps some of these things are fixed in a newer version of braid? The version I have (probably quite old by now) is braid: braid 0.4.0+f61aa9ef5989b924516a28a248b977a7020f0e37.

astraw commented 4 years ago

I think, to some degree, your questions are covered in the docs in this repo, specifically users-guide/src/calibration.md. It would be really helpful if you send any fixes or improvements to the docs back here.

I do realize that this is under-documented and that the UI in Braid/Strand-Cam is not particularly user friendly for this.

What is the correct process for performing the calibration?

Mathematically I think you need at least 6 images. Practically, I get images from:

Where are the files saved?

$HOME/.config/strand-cam/camera_info

What do I need to do to integrate the checkerboard calibrations into the multicamselfcal routine etc.

See https://github.com/strawlab/nextgen-camera-users/blob/master/users-guide/src/calibration.md#run-multicamselfcal-on-data-collected-with-braid .

Finally, I note that the latest releases are at https://github.com/strawlab/nextgen-camera-users/releases and indeed braid 0.7.4 has been out for almost 7 months.

astraw commented 4 years ago

I'm going to go ahead and close this, but feel free to open it or a new issue if you have further issues.