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Camera Tracking: Out of scene fixed targets.

Fixed targets, usually with a retro-reflective material are installed above the space where the camera is to be tracked. The targets are viewed by a small ancillary camera rigidly attached to the main camera. The lens can be fitted with sensors to supply zoom and focus positions.

Typically, once the initial calibration is done, these are fit and forget solutions with a positional accuracy of less than 1mm and viewpoint of 100th degree.

There is a limit to the angle at which the targets are viewed of around 45 degrees, but this can be mitigated by installing targets on the walls as well.