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Patent
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G09G 3/02 (2006.01) G03B 21/00 (2006.01) G06F 3/033 (2006.01) G09G 3/36 (2006.01) H04N 3/14 (2006.01) H04N 5/272 (2006.01) H04N 5/66 (2006.01) H04N 5/74 (2006.01) H04N 17/04 (2006.01)
Patent
CA 2129346
2129346 9315496 PCTABScor01 A method and optical system auxiliary input calibration arrangement (10A) accurately and reliably discriminate between a user generated image and a video source generated image, such as one produced by a computer. The calibration arrangement includes amplifier devices (176a) for increasing the strength of a video information signal (178A) indicative of the video generated image, and a user generated auxiliary input signal (179A) indicative of an auxiliary input light image, without increasing spurious ambient light signals. A discrimination circuit (46A) generates a detection signal whenever the amplified information signals are greater than a predetermined reference level signal. The microprocessor (42A) controls the exposure time of the light sensing device and selects an appropriate level of amplification for the output signal from the sensing device to increase light sensitivity between the vieo source generated light images as compared to the user generated auxiliary light images. The optical auxiliary input arrangement (11B) accurately and reliably discriminates between user generated double click information without the need of the user being so steady of hand as to cause the auxiliary light information beam to illuminate the same precise location on the viewing surface during the double click operation.
Busch Jeffrey W.
Hauck Lane T.
Lizon Richard M.
Marshall Roger
Shapiro Leonid
Proxima Corporation
Ridout & Maybee Llp
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