Supporting Documentation FAQ


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Performing the Calibration

Watch the Theia Tutorial on how to perform the calibration:

  1. Lay the chessboard on the ground.

    Note: The chessboard has to be fully in view in a minimum of three cameras, but try having it visible in as many views as possible. Your origin will be set where the two blue squares intercept, so be sure to align the intercept with your desired origin.

  2. Leave the volume, and press record, having the first few seconds of the recording be just the chessboard with as few obstructions as possible.

  3. Pick up the chessboard and start showing the chessboard to groupings of three cameras.

    Note: Move slow and deliberately to avoid motion blur. A minimum of three cameras must see the board at all times, so think of showing the board to groupings of three, with an overlapping fourth camera during transitions. Vary the angle of the board while calibrating.

  4. Once you have gone around and are confident every camera has seen the chessboard, set the chessboard back on the ground where you want your origin to be set.

    Note: later on you will be able to choose what frame you want to use as your origin (either a starting frame when the board is flat on the ground or one at the end when you set it back down) so it’s not mandatory to line it back up with the origin at this step, but it is good practice so that there is a “backup” origin frame.

Calibration Tips


To learn how to process the calibration in Theia, see Organizing and Processing Data 


Common Reasons the Calibration Fails 

There are many reasons why a calibration may fail. A few of the most common reasons include: