公开(公告)号：US20170061226A1

公开(公告)日：2017-03-02

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: G06K9/20 ,  G06K9/00 ,  G06T7/00 ,  G06K9/46

CPC classification number: G06K9/2036 ,  G01D5/34 ,  G06F3/0312 ,  G06K9/00986 ,  G06K9/2027 ,  G06K9/4661 ,  H04N5/2256 ,  H04N19/00

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.

Abstract translation: 本公开涉及一种光学编码器，其被配置为通过特征识别技术提供精确的编码参考数据。 为了应用本公开，不需要在工作表面上提供特定的致密图案。 可以通过检测工作表面的表面特征来产生精确的编码参考数据。

公开(公告)号：US20220110498A1

公开(公告)日：2022-04-14

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: A47L11/40 ,  G05D1/02 ,  H04N5/235 ,  G06T7/507

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：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.

公开(公告)号：US20200226764A1

公开(公告)日：2020-07-16

申请号：US16831825

申请日：2020-03-27

Applicant: PixArt Imaging Inc.

Inventor： Keen-Hun LEONG ,  Boon-How KOK ,  Dennis DOMINIC DONALD

IPC: G06T7/20 ,  B60W30/00 ,  B62D15/02 ,  G01C25/00 ,  G01C22/00 ,  H04N5/247 ,  G06F3/0362

Abstract: An optical sensor system mounted in a wheel arch of a car for determining trajectory of the car includes: a first optical sensor mounted in the wheel arch above a wheel and located behind a first clear casing that does not touch the wheel; and a second optical sensor mounted in the wheel arch on one side of the wheel and located behind a second clear casing that does not touch the wheel. The first optical sensor and second optical sensor perform a plurality of counts corresponding to respectively capturing a plurality of images of the wheel. The captured images are compared with a reference image to determine a 2D displacement of the wheel from its original position. The trajectory of the car is determined by calculating a turning degree of the wheel according to a trigonometric manipulation of the measured 2D displacement.