公开(公告)号：US12018927B2

公开(公告)日：2024-06-25

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: G01D5/347 ,  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：US11585651B2

公开(公告)日：2023-02-21

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.

公开(公告)号：US20250025010A1

公开(公告)日：2025-01-23

申请号：US18907619

申请日：2024-10-07

Applicant: PixArt Imaging Inc.

Inventor： KEEN-HUN LEONG ,  Sai-Mun Lee ,  Ching-Geak Chan

IPC: A47L11/40 ,  G06T5/50

Abstract: There is provided a mobile robot including a light source, an image sensor and a processor. The image sensor respectively captures bright image frames and dark image frames corresponding to the light source being turned on and turned off. The processor identifies that the mobile robot faces a cliff when a gray level variation between the bright image frames and the dark image frames is very small, and controls the mobile robot to stop moving forward continuously.

公开(公告)号：US12137855B2

公开(公告)日：2024-11-12

申请号：US17353818

申请日：2021-06-22

Applicant: PIXART IMAGING INC.

Inventor： Keen-Hun Leong ,  Sai-Mun Lee ,  Ching-Geak Chan

IPC: G06T5/50 ,  A47L11/40 ,  G05D1/00

Abstract: There is provided a mobile robot including a light source, an image sensor and a processor. The image sensor respectively captures bright image frames and dark image frames corresponding to the light source being turned on and turned off. The processor identifies that the mobile robot faces a cliff when a gray level variation between the bright image frames and the dark image frames is very small, and controls the mobile robot to stop moving forward continuously.

公开(公告)号：US11105608B2

公开(公告)日：2021-08-31

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: G01D5/347 ,  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.

公开(公告)号：US10210412B2

公开(公告)日：2019-02-19

申请号：US15347309

申请日：2016-11-09

Applicant: PIXART IMAGING INC.

Inventor： Boon-How Kok ,  Keen-Hun Leong ,  Ching-Geak Chan ,  Chiang-Hee Lim ,  Chu-Leik Ho ,  Hsin-Chia Chen ,  Yen-Min Chang

IPC: G01D5/34 ,  G06K9/20 ,  G06K9/46 ,  G06K9/00 ,  G06F3/03 ,  H04N19/00 ,  H04N5/225

Abstract: The present disclosure is related to an optical encoder which is configured to provide precise coding reference data by feature recognition technology. To apply the present disclosure, it is not necessary to provide particular dense patterns on a working surface. The precise coding reference data can be generated by detecting surface features of the working surface.