New in Vicon Nexus 2 - Improved system calibration refinement

Improved system calibration refinement

Calibration refinement now provides a fast, reliable way to fine-tune an existing camera calibration, for example, as part of your daily calibration workflow before beginning the day’s captures.

Full Calibration consists of an initialization phase, followed by a multi-pass process to optimize the camera positions.

From Nexus 2.1, Calibration Refinement uses exactly the same process as full calibration, but without the initialization phase. It provides a reliable way to refine existing calibration data to produce a calibration that is as good as a full calibration of the same system, but is much faster.

Important: As Calibration Refinement operates on existing data, you must have loaded a full calibration into Nexus before running the refinement calibration.

To save time while maintaining accuracy, you can perform both full and refinement calibration on any selected camera(s), as well as on all cameras.

Note that the value specified for Refinement frames applies to the number of frames used:

❙ By Auto Stop

❙ In the refinement phase of a Full Calibration

❙ When running a Calibration Refinement

When to use a refinement calibration

The following table gives guidance on when to use each type of calibration:

Scenario	Type of calibration
A full calibration of all cameras has recently been performed, but since then, several cameras have been repositioned to another part of the volume.	Full Calibration on just the moved cameras, with a short wand wave that concentrates on the moved cameras,
A full calibration of all cameras has recently been performed, but during the trial, one camera was accidentally slightly bumped.	Calibration Refinement on the bumped camera, with a short wand wave that concentrates on the bumped camera.
Since yesterday’s full calibration, environmental factors may have caused small changes in the camera positions and it is necessary to re-calibrate them accurately and quickly.	Calibration Refinement of all cameras, with a normal length wand wave that includes all cameras.