Patent ID: 8754858

Claim:
A method to parameterize and recognize circular gestures on touch sensitive surfaces comprising: dividing the touch sensitive surface into four quadrants; detecting a transition from a first quadrant into a second quadrant; time-stamping and tracking each detected quadrant transition; computing the time between quadrant transitions so that the circular speed and direction of the circular gestures on the touch sensitive surface can be detected; and classification of the four quadrants; wherein each touch point (X, Y) across time is grouped in a respective quadrant depending on the changes in the current X and Y positions in a current touch frame with respect to a previous frame, wherein a tracking touch point is classified in Quadrant 1 (Q 1 ) when a current Y coordinate is less than a previous Y coordinate and a current X coordinate is greater than a previous X coordinate, wherein a tracking touch point is classified in Quadrant 2 (Q 2 ) when a current Y coordinate is greater than a previous Y coordinate and a current X coordinate is greater than a previous X coordinate, wherein a tracking touch point is classified in Quadrant 3 (Q 3 ) when a current Y coordinate is greater than a previous Y coordinate and a current X coordinate is less than a previous X coordinate, and wherein a tracking touch point is classified in Quadrant 4 (Q 4 ) when a current Y coordinate is less than a previous Y coordinate and a current X coordinate is less than a previous X coordinate.