Methods and apparatus for reducing perceived pen-to-ink latency on touchpad devices

摘要

A method for reducing line display latency on a touchpad device is disclosed. The method comprises storing information regarding a plurality of prior touch events on a touch screen of the touchpad device into an event buffer. It further comprises determining an average speed and a predicted direction of motion of a user interaction with the touch screen using the plurality of prior touch events. Next, it comprises calculating a first prediction point using the average speed, the predicted direction, and a last known touch event on the touch screen. Subsequently, it comprises applying weighted filtering on the first prediction point using a measured line curvature to determine a second prediction point. Finally, it comprises rendering a prediction line between the last known touch event on the touch screen and the second prediction point.

主权项

1. A method for reducing display latency on a touchpad device, said method comprising:
storing information regarding a plurality of prior touch events on a touch screen of said touchpad device into an event buffer; determining an average speed and a predicted direction of motion regarding a user interaction with said touch screen using said plurality of prior touch events; calculating a prediction point using said average speed, said predicted direction, and a last known touch event on said touch screen, wherein said calculating comprises applying weighted filtering on said prediction point using a measured line curvature, wherein said applying comprises determining said measured line curvature using said information regarding a plurality of prior touch events in said event buffer; and rendering a prediction line between said last known touch event on said touch screen and said prediction point.