TIME SYNCHRONIZATION IN AN IMAGE PROCESSING CIRCUIT

A controllable light source (102) is controlled to emit modulated light, preferably using a uniquely recognizable modulation pattern. A plurality of camera units (10) captures images that contain the light source. Clock time values at a time corresponding to capture of the image are captured from respective clock circuits (120) associated with the camera units (10) that capture the images. The modulated light is detected in the captured images. Relative calibration of the clock circuits (120) with respect to each other is performed using the associated clock time values of the images wherein the modulated light is detected.