초록 ▼

A method and apparatus for recognizing a gesture input on a display screen of a computer system. A stroke is input by a user on the screen, and the stroke is smoothed by reducing the number of points that define the stroke. The number of points are reduced by calculating a weighted position for a ne

A method and apparatus for recognizing a gesture input on a display screen of a computer system. A stroke is input by a user on the screen, and the stroke is smoothed by reducing the number of points that define the stroke. The number of points are reduced by calculating a weighted position for a new point between two adjacent points that are within a threshold distance, and replacing a plurality of points that are separated by less than the threshold distance with the new point. The stroke is also normalized by dividing coordinates of the points by a scaling factor and storing selected points of the stroke in a prototype buffer. The normalized stroke is matched to one or more of a plurality of gesture prototypes by utilizing a correlation score that is calculated for each prototype. The gesture prototypes preferably include standard gestures having standardized shapes as well as gestures input by a user, and include bracket and pigtail gestures. An alternative embodiment determines whether the stroke is part of a multiple stroke gesture and, if so, adds the stroke to previously-entered strokes.

대표청구항 ▼

A method for recognizing a gesture input on a display screen for a computer system, the method comprising the steps of: (a) processing a stroke entered on a computer screen to smooth said stroke, said stroke including a plurality of points, said processing step including reducing the number of point

A method for recognizing a gesture input on a display screen for a computer system, the method comprising the steps of: (a) processing a stroke entered on a computer screen to smooth said stroke, said stroke including a plurality of points, said processing step including reducing the number of points that define said stroke such that said points of said smoothed stroke are located at least a threshold distance apart from one another, and including the substeps of: (i) calculating a position for a new point that is positioned between two adjacent points in the stroke that are separated by less than the threshold distance; and (ii) replacing a plurality of points that are separated by less than the threshold distance with said new point, wherein the weight given to the location of a specific new point is proportional to the number of points that are replaced by the specific new point; (b) normalizing said smoothed stroke; (c) determining whether said normalized stroke matches one of a plurality of gesture prototypes; and (d) when at least one gesture prototype matches said normalized stroke, selecting the gesture represented by a best matched gesture prototype as an interpretation of said stroke.