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：US11965968B2

公开(公告)日：2024-04-23

申请号：US17110315

申请日：2020-12-03

Applicant: PixArt Imaging Inc.

Inventor： Zi Hao Tan ,  Joon Chok Lee ,  Keen-Hun Leong ,  Sai Mun Lee

IPC: G01C3/08 ,  G01S7/4861 ,  G01S7/4865 ,  G01S17/894

CPC classification number: G01S17/894 ,  G01S7/4861 ,  G01S7/4865

Abstract: An optical sensing system comprising: a processing circuit; an optical sensor, configured to sense first optical data respectively in first sensing time intervals; and a TOF (Time of Flight) optical sensor, configured to sense second optical data respectively in second sensing time intervals. The processing circuit computes a distance between a first object and the optical sensing system according to the second optical data. The first sensing time intervals do not overlap with the second sensing time intervals.

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：US11049264B2

公开(公告)日：2021-06-29

申请号：US16592718

申请日：2019-10-03

Applicant: PixArt Imaging Inc.

Inventor： Keen-Hun Leong ,  Joon Chok Lee ,  Yueh Mei Kim

IPC: G06T7/20 ,  H04N5/232 ,  G06T7/246 ,  G06T7/73

Abstract: A marker detecting device comprising: an image sensor, comprising a plurality of difference sensing regions; and a processing circuit, configured to determine a marker exists when a first difference of pixel value data of images captured by different ones of the difference sensing regions is larger than a marker difference threshold and to determine the marker does not exist when the first difference is smaller than the marker difference 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.