Abstract: An image capture method comprises generating a synchronization signal based on modulated illumination; and synchronizing image frame capture of at least one image sensor using the synchronization signal with the illumination timing of an active pointer within a region of interest in the field of view of the at least one image sensor.

Abstract: An interactive input system comprises an optical waveguide, a radiation source directing radiation into the optical waveguide, the radiation undergoing total internal reflection within the optical waveguide in response to at least one touch input on a surface of the optical waveguide. At least one imaging device is positioned adjacent to the waveguide, the at least one imaging device having a field of view looking inside the optical waveguide and capturing image frames thereof. Processing structure processes the image frames captured by the at least one imaging device to determine a location of the at least one touch input based on a frequency of reflections of the radiation appearing in the image frame.

Abstract: A method for adjusting the position of a light curtain emitted by an illumination assembly over a surface, comprises determining a position of the light curtain; calculating a difference between the determined position of the light curtain and a desired position of the light curtain; and adjusting the position of the illumination assembly based on the calculated difference.

Abstract: An interactive panel comprises an optical waveguide within which totally internally reflected (TIR) illumination propagates, a display device beneath the optical waveguide and a partially transparent layer beneath the display device. The partially transparent layer reflects backlight illumination towards the display device and at least allows TIR illumination escaping from the optical waveguide and passing through the optical waveguide and the display panel, as a result of one or more contacts made on the optical waveguide, to pass therethrough.

Abstract: A method for adjusting the position of a light curtain emitted by an illumination assembly over a surface, comprises determining a position of the light curtain; calculating a difference between the determined position of the light curtain and a desired position of the light curtain; and adjusting the position of the illumination assembly based on the calculated difference.

Abstract: An image capture method comprises generating a synchronization signal based on modulated illumination; and synchronizing image frame capture of at least one image sensor using the synchronization signal with the illumination timing of an active pointer within a region of interest in the field of view of the at least one image sensor.

Abstract: An interactive panel comprises an optical waveguide within which totally internally reflected (TIR) illumination propagates, a display device beneath the optical waveguide and a partially transparent layer beneath the display device. The partially transparent layer reflects backlight illumination towards the display device and at least allows TIR illumination escaping from the optical waveguide and passing through the optical waveguide and the display panel, as a result of one or more contacts made on the optical waveguide, to pass therethrough.

Abstract: A user input system comprises a top structure defining a touch surface. The top structure is disposed above and separated from a bottom structure by an air gap. Conductive resistive material is provided on facing surfaces of the upper and lower structures. The conductive resistive material on at least one of the upper and lower structures is configured to define at least a pair of electrically isolated resistive sheets. The top and bottom structures are moveable relative to one another in response to one or more contacts on the touch surface to bring the conductive resistive material on the top and bottom structures into contact adjacent each contact location.