公开(公告)号：US11328499B2

公开(公告)日：2022-05-10

申请号：US17151305

申请日：2021-01-18

Applicant: PixArt Imaging Inc.

Inventor： Zi-Hao Tan ,  Kevin Len-Li Lim

IPC: G06F3/01 ,  G06F3/0346 ,  G06F3/038 ,  G06V10/22 ,  H03H17/02 ,  G06V10/20 ,  G06F1/04 ,  G06F3/0354 ,  G06F3/03

Abstract: There is provided a 2-stage moving average filter for a navigation device including a delta regulator and an N-taps average circuit. The delta regulator is used as a first stage to receive motion delta at a varied frequency, and combine or split the received motion delta to output a regulated motion delta at a fixed frequency. The N-taps average circuit receives and averages N regulated motion delta and outputs the averaged motion delta at a fixed frequency.

公开(公告)号：US10929701B1

公开(公告)日：2021-02-23

申请号：US16592282

申请日：2019-10-03

Applicant: PixArt Imaging Inc.

Inventor： Zi-Hao Tan ,  Kevin Len-Li Lim

IPC: G06F3/01 ,  G06F3/0346 ,  G06F3/038 ,  G06K9/20 ,  H03H17/02 ,  G06K9/60 ,  G06F1/04

Abstract: There is provided a 2-stage moving average filter for a navigation device including a delta regulator and an N-taps average circuit. The delta regulator is used as a first stage to receive motion delta at a varied frequency, and combine or split the received motion delta to output a regulated motion delta at a fixed frequency. The N-taps average circuit receives and averages N regulated motion delta and outputs the averaged motion delta at a fixed frequency.

公开(公告)号：US10509493B2

公开(公告)日：2019-12-17

申请号：US15622598

申请日：2017-06-14

Applicant: PixArt Imaging Inc.

Inventor： Zi-Hao Tan ,  Kevin Len-Li Lim

IPC: G06F3/0354 ,  G06F3/038 ,  G06F1/3234 ,  G06F3/03

Abstract: A navigation device including an image sensor, a processor and a memory is provided. The memory stores a lookup table of a plurality of frame rates each corresponding to one frame period extender. The image sensor captures a pair of image frames. The processor calculate a current displacement according to the pair of image frames, read a next frame period and a corresponding frame period extended value from the memory according to the calculated current displacement, and insert an inactive period after the pair of image frames when the frame period extended value is larger than 1 and the current displacement is larger than a displacement threshold.

公开(公告)号：US11422025B2

公开(公告)日：2022-08-23

申请号：US17124332

申请日：2020-12-16

Applicant: PixArt Imaging Inc.

Inventor： Zi-Hao Tan ,  Joon-Chok Lee

IPC: G01J1/42 ,  G01J1/44

Abstract: There is provided an optical sensor including a photodiode, a wave converter, a pixel array and a processor. The photodiode detects ambient light flicker to generate sine waves. The wave converter converts the sine waves to square waves. The processor uses a sampling frequency to count the square waves, and identifies whether the ambient light flicker is well detected according to a counting value of each square wave and a counting value variation of multiple square waves within a count period to accordingly determine whether to adjust an acquiring phase of the image frame.

公开(公告)号：US10969883B2

公开(公告)日：2021-04-06

申请号：US16594329

申请日：2019-10-07

Applicant: PixArt Imaging Inc.

Inventor： Zi-Hao Tan ,  Kevin Len-Li Lim

IPC: G06F3/038 ,  G06F3/0354 ,  G06F3/03 ,  G06T7/246

Abstract: An optical navigation device including an image sensor, a navigation engine, a smoothing engine and an adjusting interface. The image sensor generates image frames. The navigation engine calculates displacement according to the image frames. The smoothing engine changes a smoothing level for smoothing the calculated displacement according to a trigger signal sent from the adjusting interface.

公开(公告)号：US10324545B2

公开(公告)日：2019-06-18

申请号：US15709666

申请日：2017-09-20

Applicant: PixArt Imaging Inc.

Inventor： Zi-Hao Tan ,  Kevin Len-Li Lim

IPC: G06F3/038 ,  G06F3/03 ,  G06T7/246 ,  G06F3/0354

Abstract: An optical navigation device including an image sensor, a navigation engine, a smoothing engine and an adjusting interface. The image sensor generates image frames. The navigation engine calculates displacement according to the image frames. The smoothing engine changes a smoothing level for smoothing the calculated displacement according to a trigger signal sent from the adjusting interface.

公开(公告)号：US11953371B2

公开(公告)日：2024-04-09

申请号：US17863663

申请日：2022-07-13

Applicant: PixArt Imaging Inc.

Inventor： Zi-Hao Tan ,  Joon-Chok Lee

IPC: G01J1/42 ,  G01J1/44

CPC classification number: G01J1/4204 ,  G01J1/44 ,  G01J2001/446

Abstract: There is provided an optical sensor including a photodiode, a wave converter, a pixel array and a processor. The photodiode detects ambient light flicker to generate sine waves. The wave converter converts the sine waves to square waves. The processor uses a sampling frequency to count the square waves, and identifies whether the ambient light flicker is well detected according to a counting value of each square wave and a counting value variation of multiple square waves within a count period to accordingly determine whether to adjust an acquiring phase of the image frame.

公开(公告)号：US10331244B2

公开(公告)日：2019-06-25

申请号：US15631160

申请日：2017-06-23

Applicant: PixArt Imaging Inc.

Inventor： Zi-Hao Tan ,  Kevin Len-Li Lim

IPC: G06F3/038 ,  G06F3/0354 ,  G01P15/03

Abstract: A navigation device including an image sensor, a processor and a memory is provided. The memory stores a lookup table of a plurality of moving speeds each corresponding to one frame period. The image sensor captures image frames successively. The processor calculates a current speed according to a current image frame and a previous image frame, reads a frame period from the lookup table according to the calculated current speed, wherein the read frame period is multiplied by a ratio, which is smaller than 1, when an acceleration is confirmed by the processor according to the captured image frames.

公开(公告)号：US10042383B2

公开(公告)日：2018-08-07

申请号：US15896106

申请日：2018-02-14

Applicant: PixArt Imaging Inc.

Inventor： Kevin Len-Li Lim ,  Zi-Hao Tan

IPC: G06F1/04 ,  H03K3/00 ,  G06F1/08 ,  G01S19/23

CPC classification number: G06F1/08 ,  G01S19/235

Abstract: A clock calibration method of a navigation system is provided. The clock calibration method includes: entering a calibration mode; sequentially issuing, by a host, a count start signal and a count end signal separated by a time interval; counting a local oscillation frequency of a local oscillator when a navigation device receives the count start signal from the host; disabling the counting when the navigation device receives the count end signal from the host and generating a current count; generating a calibration signal according to the current count and a predetermined count corresponding to the time interval; and calibrating the local oscillation frequency of the local oscillator according to the calibration signal.

公开(公告)号：US11946800B2

公开(公告)日：2024-04-02

申请号：US17722637

申请日：2022-04-18

Applicant: PixArt Imaging Inc.

Inventor： Zi-Hao Tan

IPC: G01J1/42 ,  G01J1/44 ,  G01P13/00

CPC classification number: G01J1/4204 ,  G01J1/44 ,  G01P13/00 ,  G01J2001/446

Abstract: There is provided an optical sensor including a photodiode, a wave converter, a pixel array and a processor. The photodiode detects ambient light flicker to generate sine waves. The wave converter converts the sine waves to square waves. The processor uses a sampling frequency to count the square waves, and identifies whether the ambient light flicker is well detected according to a counting value of each square wave and a counting value variation of multiple square waves within a count period to accordingly determine whether to recognize a frequency of ambient light flicker and adjust an acquiring phase of the image frame.