公开(公告)号：US20230152085A1

公开(公告)日：2023-05-18

申请号：US18097466

申请日：2023-01-16

Applicant: PixArt Imaging Inc.

Inventor： KEEN-HUN LEONG ,  TONG-SEN LIEW ,  CHING-GEAK CHAN

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

CPC classification number: G01B11/046 ,  G01B21/047 ,  G06F3/0317

Abstract: There is provided an optical positioning system including a detected surface, an optical sensor, a register and a processor. The detected surface has interleaved bright regions and dark regions arranged in a transverse direction. The optical sensor captures an image frame of the detected surface within a field of view thereof and using a shutter time, wherein the detected surface and the optical sensor have a relative movement in the transverse direction. The register records a type of a last passed edge. The processor calculates a first position using a first algorithm upon the recorded last passed edge being a bright-to-dark edge and the field of view being aligned with one of the dark regions, and calculates a second position using a second algorithm, different from the first algorithm, upon the recorded last passed edge being a dark-to-bright edge and the field of view being aligned with the same one of the dark regions.

公开(公告)号：US20210348916A1

公开(公告)日：2021-11-11

申请号：US17380621

申请日：2021-07-20

Applicant: PixArt Imaging Inc.

Inventor： KEEN-HUN LEONG ,  TONG-SEN LIEW ,  CHING-GEAK CHAN

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

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.