公开(公告)号：US20210123720A1

公开(公告)日：2021-04-29

申请号：US16662606

申请日：2019-10-24

Applicant: PixArt Imaging Inc.

Inventor： Keen-Hun LEONG ,  Tong-Sen LIEW ,  Ching-Geak CHAN

IPC: G01B11/04 ,  G06F3/03 ,  G01B21/04

Abstract: There is provided an operating method of an optical positioning system including: capturing an image frame of a detected surface, which has interleaved bright regions and dark regions, using a field of view and a shutter time of an optical sensor counting a number of edge pairs between the bright regions and the dark regions that the field of view passes; calculating an average value of the image frame; calculating a ratio between the calculated average value and the shutter time; determining that the field of view is aligned with one of the dark regions when the ratio is smaller than a ratio threshold; and determining that the field of view is aligned with one of the bright regions when the ratio is larger than the ratio threshold.