System for user interaction with a computer system

Details System for user interaction with a computer system System for user interaction with a computer system

2011-04-26

2011-04-26

Lee, Seung H (Department: 2887)

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Reexamination Certificate

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07931208

ABSTRACT:
Provided is a system for user interaction with a computer system. The system includes a printed surface having visible graphical information indicating a user selectable operation, and coded data. The coded data has a plurality of marks positioned relative to a predetermined pattern, the predetermined pattern having a rotationally invariant structure and an orientation target structure. The system further includes an optical sensing device for capturing images of the coded data, and a processor for determining relative rotation of the coded data from the images.

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