TRACKING METHOD AND OPTICAL INPUT DEVICE USING THE SAME

摘要

A tracking method of an optical input device includes: capturing a first image as a reference frame and an input image subsequent to the first image as a compare frame while the optical input device operates; computing correlation between the compare frame and the reference frame for a first correlation window to obtain a first peak correlation value; computing another correlation between the compare frame and the reference frame for a second correlation window when the first peak correlation value identified is located at a corner of the first correlation window; when a second peak correlation value of the second correlation window is determined to be greater than the first peak correlation value, computes a displacement information of the optical input device based on the pixel position associated with the second peak correlation value identified in the compare frame.

主权项

1. A tracking method, adapted for tracking a movement of an optical input device, the tracking method comprising:
a) capturing a first image as a reference frame and an input image subsequent to the first image as a compare frame while the optical input device operates; b) computing correlation between the compare frame and the reference frame for a first correlation window to obtain a first peak correlation value; and c) computing another correlation between the compare frame and the reference frame for a second correlation window when the first peak correlation value obtained is located at a corner of the first correlation window to determine whether the first peak correlation value is the maximum correlation value between the compare frame and the reference frame, wherein the second correlation window is a predetermined region of the compare frame centering on the position of the first peak correlation value.