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公开(公告)号：US20240411382A1
公开(公告)日：2024-12-12
申请号：US18207691
申请日：2023-06-09
Applicant: PixArt Imaging Inc.
Inventor： Zi Hao Tan , Joon Chok Lee , Kevin Len-Li Lim
IPC: G06F3/03
Abstract: A pointing method, applied to a pointing device comprising a processing circuit, comprising: (a) receiving input delta by the processing circuit, wherein the input delta indicates supposed movement of the pointing device; (b) adjusting the input delta to generate output delta by the processing circuit, wherein the input delta has a first magnitude and the output delta has a second magnitude, wherein the second magnitude is smaller than or equal to the first magnitude; and (c) output the output delta by the processing circuit.
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公开(公告)号：US10928931B2
公开(公告)日：2021-02-23
申请号：US15883696
申请日：2018-01-30
Applicant: PixArt Imaging Inc.
Inventor： Joon-Chok Lee , Kevin Len-Li Lim
IPC: G06F3/0354 , G01B11/14 , G06F3/03
Abstract: There is provided a navigation device including an image sensor and a processing unit. The image sensor is configured to capture reflected light of a work surface with a low-speed period to generate image frames, wherein the image sensor captures a pair of image frames in each low-speed period. The processing unit is configured to calculate acceleration according to the pair of image frames to accordingly identify whether to adjust the low-speed period to a high-speed period.
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公开(公告)号：US10775868B2
公开(公告)日：2020-09-15
申请号：US16171485
申请日：2018-10-26
Applicant: PixArt Imaging Inc.
Inventor： Joon-Chok Lee , Kevin Len-Li Lim
IPC: G06F1/32 , G06F3/03 , G06F1/3234 , H04N5/235 , H04N5/3745 , H04N5/357 , G06F3/0354 , G06F3/038
Abstract: There is provided a navigation device including an image sensor, an analog to digital converter and a processor. The image sensor is used to output an analog image using an exposure time. The analog to digital converter is used to convert the analog image to a digital image using a resolution. The processor is used to identify an image quality of the digital image, and adjust at least one of the exposure time of the image sensor and the resolution of the analog to digital converter according to the image quality thereby adjusting the operation power by changing data length actually processed by the processor.
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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.
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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
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.
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Patent Agency Ranking
公开(公告)号：US11941886B2
公开(公告)日：2024-03-26
申请号：US17385957
申请日：2021-07-27
Applicant: PixArt Imaging Inc.
Inventor： Kevin Len-Li Lim , Joon Chok Lee
CPC classification number: G06V20/52 , G06V10/50 , G06V10/60 , G06V10/758
Abstract: An object detection method of effectively increasing identification accuracy is applied to a camera apparatus and includes acquiring a reference image and a second reference image containing a specific surveillance area respectively via a first exposure parameter and a second exposure parameter greater than the first exposure parameter, utilizing the first exposure parameter and the second exposure parameter to respectively capture a first detection image and a second detection image during an object detection period, computing a first pixel value variation between the first reference image and the first detection image and a second pixel value variation between the second reference image and the second detection image, and comparing the first pixel value variation with the second pixel value variation to determine whether a target object is within the specific surveillance area.
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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
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.
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公开(公告)号：US10572033B2
公开(公告)日：2020-02-25
申请号：US15927254
申请日：2018-03-21
Applicant: PIXART IMAGING INC.
Inventor： Joon-Chok Lee , Kevin Len-Li Lim
IPC: G06F3/0354 , G06F3/044 , G06F3/0362
Abstract: There is provided a mouse device including a mouse case, a detection switch and a control chip. The mouse case is held by a user and operated on a work surface. The detection switch is arranged on the mouse case and configured to output a detected signal according to user operation. The control chip is electrically coupled to the detection switch and configured to enable or disable an angle snapping function according to the detected signal.
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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.
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公开(公告)号：US20180157346A1
公开(公告)日：2018-06-07
申请号：US15883696
申请日：2018-01-30
Applicant: PixArt Imaging Inc.
Inventor： Joon-Chok Lee , Kevin Len-Li Lim
IPC: G06F3/0354 , G06F3/03 , G01B11/14
CPC classification number: G06F3/03543 , G01B11/14 , G06F3/0304
Abstract: There is provided a navigation device including an image sensor and a processing unit. The image sensor is configured to capture reflected light of a work surface with a low-speed period to generate image frames, wherein the image sensor captures a pair of image frames in each low-speed period. The processing unit is configured to calculate acceleration according to the pair of image frames to accordingly identify whether to adjust the low-speed period to a high-speed period.
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