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Vicon MX Hardware System Reference 12-1

12MX Calibration Kit

This chapter describes the contents that can be included in a

calibration kit supplied with Vicon MX, explains the calibration

process, and provides guidance on the usage and maintenance of

calibration objects. The number and type of contents depend upon the

specific Vicon application you have ordered.

Important

For details on the calibration kit actually supplied with your Vicon MX system,

see the bill of materials accompanying your product shipment. If any items

are missing on receipt, or if you require additional calibration objects later,

please contact Vicon Motion Systems or your nearest agent or distributor.

Calibration Process

Vicon MX performance depends on the accuracy with which the

system is calibrated during a two-stage system calibration process:

• Dynamic Stage (Camera Calibration)

During the dynamic stage of the calibration process, the Vicon

application software calculates the physical position and

orientation of each Vicon camera in the capture volume based on

the movement of a calibration wand. This stage, called the

Dynamic Calibration (DynaCal) process, calculates internal (focal

length and image distortion) and external (position and

orientation) camera parameters in two simultaneous phases:

• Linearization phase: The optical distortion of the camera

lenses and any other non-linearity in the system is measured,

and a correction matrix is calculated. Corrections are applied

to every frame of data subsequently acquired by each camera.

• Photogrammetric Calibration phase: The physical

locations and orientations of the cameras are calculated,

referring to a user-defined set of coordinates.

• Static Stage (Capture Volume Calibration)

During the static stage of the calibration process, the Vicon

application software measures the position of a calibration object

in the capture volume and sets the global coordinate system.

In Nexus and Vicon iQ, the dynamic is performed before the static

stage. In Workstation, the static is performed before the dynamic.

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