Pixart Imaging Incorporated

Smart Technologies Ulc

Minister of National Defence

Lawrence Bruce Hewitt

Grant Howard McGibney

David Holmgren

William D Cornish

Trevor Akitt

Clinton Lam

Charles Ung

Grant Mcgibney

An illumination assembly for an interactive input system (), comprises at least one imaging device () capturing image frames of a region of interest; a plurality of illumination sources () associated with the imaging device and being located at different positions relative to the imaging device, the illumination sources providing illumination to the region of interest; and a controller () communicating with the illumination sources, the controller conditioning the illumination sources so that the illumination sources provide illumination to the region of interest in succession, the timing of image frame capture by the imaging device being coordinated with the illumination pattern of the illumination sources.

Interactive system with successively activated illumination sources

An interactive input system comprises at least two imaging assemblies capturing image frames of a region of interest from different vantages, each imaging assembly comprising an image sensor and signal processing circuitry implemented on an application specific integrated circuit (ASIC), image data acquired by the image sensor being pre-processed by the signal processing circuitry; and processing structure processing pre-processed image data output by the imaging assemblies to determine the location of at least one pointer within the region of interest.

Interactive input system and method

A microwave frequency divider operable in 2-16 GHZ range over octave bandwidths. A circuit resonant at a subharmonic frequency is formed by a pair of input microstrip transmission lines coupled to a pair of output microstrip transmission lines. Each input line is terminated by a varactor diode. The input signal is supplied to the resonant circuit by a pair of microstrip lines functioning as a two stage quarter wave transformer. A pair of slots are formed in the ground plane underneath the resonant circuit. The electric field distortion thereby produced serves to bias the varactors into forward conduction for efficient subharmonic generation.

Self-biasing broadband frequency divider

Growing community of inventors

Calgary, Canada

Lawrence Bruce Hewitt