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公开(公告)号：US12125240B2
公开(公告)日：2024-10-22
申请号：US17467683
申请日：2021-09-07
Inventor： Yao Cheng Liang , Ho Man Cheng , Ka Ho Mui
CPC classification number: G06T7/80 , G06T7/74 , G06T2207/30236
Abstract: Described is a method of calibrating a camera. The method comprises defining an area observed in a field of view (FOV) of the camera as a region of interest (ROI). The method includes selecting a plurality of physical reference points in said ROI and obtaining for each reference point physical position coordinates. The method also includes obtaining from said camera FOV or camera image data pixel locations for each point of reference and pairing each pixel location with the physical position coordinates of its respective reference point. Then, a relationship is derived from the paired pixel locations and physical position coordinates to enable a selected or identified pixel location in the camera FOV or camera image data to be transformed to physical position coordinates for a corresponding physical location in said ROI.
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公开(公告)号：US12055601B2
公开(公告)日：2024-08-06
申请号：US17960283
申请日：2022-10-05
Inventor： Xin Li , Kwong Yin Tsang , Qingchun Li , Tin Ho Li
Abstract: Described is a method of identifying a short-circuit (SC) like event in a circuit breaker (CB). The method comprises sampling an incoming current to the CB to determine a maximum value of a slope of a curve of the incoming current. The method includes sampling the incoming current again before a level of the incoming current reaches a predetermined, preset, selected, or calculated SC threshold value THSC for the CB. The method involves determining from the sampled incoming current that a value of the slope of the incoming current has changed from its maximum slope value to a lower slope value to thereby determine that the incoming current is indicative of a SC like event and does not comprise a real SC event.
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3.发明公开公开(公告)号：US20240069196A1
公开(公告)日：2024-02-29
申请号：US17898956
申请日：2022-08-30
Inventor： Weiwen Yu , Ka Sing Anthony Yuen
IPC: G01S17/10 , G01S7/481 , G01S7/4865
CPC classification number: G01S17/10 , G01S7/4817 , G01S7/4865
Abstract: Systems and methods which provide time of flight (ToF) measurement techniques implementing threshold-based sampling for waveform digitizing to generate a signal waveform representing a detected ToF measurement signal from which a ToF distance measurement is determinable are described. An example ToF measurement system may apply one or more curve fitting techniques, such as using one or more curve fitting hardware accelerators, to data from threshold-based sampling for waveform digitizing of the received pulse. Examples of a ToF measurement system may implement time-to-digital converters (TDCs) to sample a received pulse using a plurality of thresholds. ToF measurement systems of examples may implement multi-point filtering, such as using a hardware accelerator.
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公开(公告)号：US20230384481A1
公开(公告)日：2023-11-30
申请号：US18448619
申请日：2023-08-11
Inventor： Yunhe Lai , Ying Suet Lau , Qingyi Yang , Jinbo Jiang
CPC classification number: G02B1/002 , G02B3/02 , G02B2207/101
Abstract: Systems and methods which provide single nanostructure-integrated metalens configurations implementing light focusing functionality are described. A single nanostructure-integrated metalens may comprise an optical substrate having a preconfigured mapping of integrated nanostructures providing metasurfaces for modulating the behaviors of electromagnetic waves to implement a thin, flat lens. A period distance for the nanostructures, a height of the nanostructures, and a quantization for lateral sizes of the nanostructures may be selected for a particular single nanostructure-integrated metalens configuration. One or more phase maps configured for light focusing may be computed with respect to one or more design wavelengths selected for focusing. The consolidated phase retardation requirements of the one ore more phase maps may be satisfied by a preconfigured mapping which defines the phase distribution for the nanostructures of a single nanostructure-integrated metalens implementation.
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公开(公告)号：US20230375747A1
公开(公告)日：2023-11-23
申请号：US17746508
申请日：2022-05-17
Inventor： Yunhe Lai , Haoyuan Bai , Qingyi Yang , Jinbo Jiang
CPC classification number: G02B1/002 , G02B27/30 , G02B27/0012 , G02B2207/101 , G01B11/22
Abstract: Systems and methods which provide single nanostructure-integrated metalens configurations implementing projector and light shaper functionality are described. A single nanostructure-integrated metalens may comprise an optical substrate having a preconfigured mapping of integrated nanostructures providing metasurfaces for modulating the behaviors of electromagnetic waves to implement a thin, flat lens. A period distance for the nanostructures, a height of the nanostructures, and a quantization for lateral sizes of the nanostructures may be selected for a particular single nanostructure-integrated metalens configuration. A first phase map may be computed with respect to structured light generation and a second phase map may be computed with respect to light collimation, wherein fusion of these phase maps may be used to define a preconfigured mapping for the nanostructures of a single nanostructure-integrated metalens implementation. The phase distribution of the first phase map may be inverse designed, such as using an inverse phase design technique.
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Patent Agency Ranking
公开(公告)号：US20230134538A1
公开(公告)日：2023-05-04
申请号：US17513148
申请日：2021-10-28
Inventor： Sui Pung Cheung , Qing Chun Li , Tin Ho Li
Abstract: The invention provides a power converter apparatus for converting an alternating current (AC) power input to a direct current (DC) power output. The apparatus comprises a plurality of n single-phase power converting circuits arranged in parallel, where n is equal to or greater than 2, wherein one of said n single-phase power converting circuits comprises a single-stage AC/DC converter module having an operating AC/DC converter; and each of a remaining n−1 of said single-phase power converting circuits comprises a two-stage converter module having an AC/DC converter as an input stage and a DC/DC transformer as an output stage.
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公开(公告)号：US11625860B1
公开(公告)日：2023-04-11
申请号：US17467664
申请日：2021-09-07
Inventor： Ho Man Cheng , Yao Cheng Liang , Ka Ho Mui
Abstract: Described is a method of calibrating a camera. The method comprises obtaining geographical coordinates of a selected physical point location within an image view of the camera and measuring an angle between an x-axis of a real-world coordinate system passing through said selected point location with respect to true north. The method includes using said obtained geographical coordinates, said measured angle, and projection data derived from characteristics of the camera to derive modified projection data for transforming a two-dimensional pixel coordinate system of the camera image view into a three-dimensional geographical coordinate system for point locations within the image view of the camera.
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公开(公告)号：US20230083307A1
公开(公告)日：2023-03-16
申请号：US17467683
申请日：2021-09-07
Inventor： Yao Cheng Liang , Ho Man Cheng , Ka Ho Mui
Abstract: Described is a method of calibrating a camera. The method comprises defining an area observed in a field of view (FOV) of the camera as a region of interest (ROI). The method includes selecting a plurality of physical reference points in said ROI and obtaining for each reference point physical position coordinates. The method also includes obtaining from said camera FOV or camera image data pixel locations for each point of reference and pairing each pixel location with the physical position coordinates of its respective reference point. Then, a relationship is derived from the paired pixel locations and physical position coordinates to enable a selected or identified pixel location in the camera FOV or camera image data to be transformed to physical position coordinates for a corresponding physical location in said ROI.
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9.发明授权公开(公告)号：US11435584B2
公开(公告)日：2022-09-06
申请号：US16352127
申请日：2019-03-13
Inventor： Dehua Liu , Chun Yip Wong , Kin Lung Chan
Abstract: Systems and methods providing optical structures providing a large field of view (FOV) for personal portable displays are described. An optical structure of embodiments comprises a catadioptric optical configuration configured to produce a magnified curved intermediate image, wherein the magnified curved intermediate image is furthered magnified with proper reflection angle and transmitted to viewer's eye. The catadioptric optical configuration may comprise two curved mirrors and a polarization prism. Optical structures comprising such catadioptric optical configurations may utilize relatively small sized image sources to produce a large FOV. Such optical structures are well suited for use in large FOV optical see through (OST) head-mounted displays (HMDs).
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10.发明申请公开(公告)号：US20220256642A1
公开(公告)日：2022-08-11
申请号：US17171190
申请日：2021-02-09
Inventor： Yaming Luo , Yunxiang Yao , Man Wai Kwan , Xiangyu Liu , Yiu Wing Edwin Chan , Kong Chau Tsang
Abstract: Described is a method and device for detecting a discontinuous transmission state (DTX) at an uplink control information (UCI) receiver device in a wireless communication system. The method involves receiving a linear block encoded signal on an uplink (UL) at said UCI receiver device and processing the received linear block encoded signal after resource element (RE) dernapping to obtain channel estimation data. The method includes determining from said channel estimation data a DTX metric for one or more selected resource blocks (RBs) and determining if a DTX state has occurred by comparing the determined DTX metric to a calculated, selected, or predetermined threshold.
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