ADAPTIVE THRESHOLDING SCHEME FOR OPTICALLY BASED TOUCH SCREENS

The sensitivity of an optically-based touch screen is substantially improved by adaptively establishing the detection threshold based on the peak trapped light measured over a number of frames on the screen being painted. In accordance with one feature of the invention, the peak trapped light from a...

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Bibliographic Details
Main Authors WEBER, DONALD J, LYNN, DALE E, DI PIAZEA, PHILIP S
Format Patent
LanguageEnglish
Korean
Published 11.10.1993
Edition5
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Summary:The sensitivity of an optically-based touch screen is substantially improved by adaptively establishing the detection threshold based on the peak trapped light measured over a number of frames on the screen being painted. In accordance with one feature of the invention, the peak trapped light from a target area painted on the screen is compared with a priorly established threshold as a way of determining that a target area is being touched by the user. In accordance with another feature of the invention, the threshold is modified in a way that compensates for possible erroneous touch indication due, for example, to bright spots on the screen.
Bibliography:Application Number: KR19860002153