MULTI-TOUCH HUMAN INTERFACE SYSTEM AND DEVICE FOR GRAPHICAL INPUT, AND METHOD FOR PROCESSING IMAGE IN SUCH A SYSTEM.

摘要

The present invention proposes a human interface system or interface device for two-dimensional interaction by contact or near contact with a computerized system, typically executing graphic processing software. This system detects contact position on a two dimensions contact surface of an interface device comprising a plurality of faces separated by at least two edges which intersect each other by at least one vertex or corner. This interface system comprises means for discriminating between at least two contact types within the group of: face contact, corner contact, and edge contact. In embodiments used with an IR illumination multi-touch surface, detection may moreover comprise the steps of: - pre-processing the image through several iterations of a "Top Hat" morphological operation of a multipixels structuring element; - binarizing said image using a variable threshold tuned with the speed of movement; and - limiting processing of the next image for interpreting a later contact position to an area close to the last recorded contact position.