Auto-aligning touch system and method

Abstract

A touch system (10, 150, 250) includes a touch surface (60, 160, 260), an image is displayed on the touch surface, and at least one camera (66, 170, 266) acquires the image of the touch surface. The stylus contact data generator generates stylus position data in response to contact of the stylus with the touch surface. Stylus position data represents the location of the stylus on the touch surface where the stylus makes contact. The processor (56, 156, 256) is in communication with at least one camera and stylus contact data generator. The processor automatically calibrates the coordinate system of the touch system using known points in the displayed image and uses the calibrated stylus position data to update the image data used to render the displayed image on the touch surface. In one embodiment, the touch system includes an active touch-sensitive screen (252). In additional embodiments, the stylus contact data generator uses the image data generated by a pair of cameras (66) with overlapping fields of view to generate the touch when the stylus is captured in an image captured by the pair of cameras (66). Pen position data.

Description

Technical field [0001] The present invention generally relates to touch systems, and particularly relates to an automatically calibrated touch system and a method of automatically calibrating the touch system. Background technique [0002] The touch system is well known in the art, and usually includes a touch screen with a touch surface, and a stylus (pointer) is used to make contact on the touch surface. The contact between the stylus and the touch surface is detected and used to generate corresponding output stylus position data, which indicates the area on the touch surface where the stylus touches. There are basically two types of touch systems available, and can be roughly divided into "active" touch systems and "passive" touch systems. [0003] The active touch system allows the user to use a special stylus to touch the touch surface to generate stylus position data. The stylus usually requires some form of self-contained power, typically a battery. This special stylus emi...

AI Technical Summary

Problems solved by technology

[0008] Although this calibration routine allows the computer display coordinate system to be mapped to the touch screen coordinate system, it is inconvenient and cumbersome to perform such a calibration routine in a touch system that uses a separate projector to project a computer-generated image onto the touch surface especially so

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