Motion capture system

A motion capture system comprising:

• a plurality of cameras;
• and
• a processing unit configured to perform processing using image data from each of the plurality of cameras, wherein
• each of the cameras comprises an accelerometer and the processing unit is configured to perform processing that is dependent on an output from the accelerometers;
• wherein the processing unit is configured to perform a first direction-selected processing associated with a camera when a perturbation in the acceleration at the camera in a first direction is detected and to perform a second direction-selected processing associated with the camera when a perturbation in the acceleration at the camera in a second direction is detected, the first and second directions being different from each other, and the first and second direction-selected processings being different from each other.