Patent ID: 8624835

Claim:
An interactive input system comprising: an illumination source associated with each of a plurality of imaging assemblies and configured to emit radiation into a region of interest; the plurality of imaging assemblies configured to capture image frames of said region of interest, at least one illumination source being in the field of view of at least one of the plurality of imaging assemblies; and controller structure communicating with each illumination source, said controller structure configured to control the intensity of radiation emitted by each illumination source during image frame capture, wherein during image frame capture by one of the plurality of imaging assemblies, said controller structure causes the intensity of emitted radiation by its associated illumination source to be at a first illumination level, and wherein during image frame capture by another of said plurality of imaging assemblies, said controller structure causes the intensity of emitted radiation by the illumination source associated with said one of the plurality of imaging assemblies to be at a second, non-zero, lower illumination level.