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    DETERMINING REFRACTION USING ECCENTRICITY IN A VISION SCREENING SYSTEM
    1.
    发明申请
    DETERMINING REFRACTION USING ECCENTRICITY IN A VISION SCREENING SYSTEM 有权

    公开(公告)号：US20210386287A1

    公开(公告)日：2021-12-16

    申请号：US17347079

    申请日：2021-06-14

    Applicant: Welch Allyn, Inc.

    Inventor： Yaolong Lou ,  See Heng Lee

    IPC: A61B3/103 ,  A61B3/00 ,  A61B3/11

    Abstract: A system for determining refractive error of an eye includes at least two light-emitting diodes (LEDs), an image capture component, and a processor configured to execute instructions to perform operations associated with a vision screening exam. For example, the processor causes each of the two LEDs to emit light to form a combined light that is output to a pupil. The processor causes the image capture component to capture an image depicting the eye while the combined light is being output. The processor determines an eccentricity at a time that the image was captured, corresponding to a simulated source location of the combined light caused by combining the light from the two LEDs. The processor determines an amount of light reflected on the pupil in the image, and a refractive error of the eye based on the eccentricity and the amount of light reflected on the pupil in the image.

    FREQUENCY-ADAPTIVE NOTCH FILTER
    5.
    发明申请
    FREQUENCY-ADAPTIVE NOTCH FILTER 有权
    频率自适应滤波器

    公开(公告)号：US20140121548A1

    公开(公告)日：2014-05-01

    申请号：US13665226

    申请日：2012-10-31

    Applicant: WELCH ALLYN, INC.

    Inventor： Yaolong Lou ,  Yong Sern Gwee ,  Peter Glocker

    IPC: A61B5/0402 ,  H03K5/00

    CPC classification number: H03H21/0021 ,  A61B5/04017 ,  A61B5/0402 ,  A61B5/7203 ,  A61B5/725 ,  A61B2560/0475

    Abstract: One apparatus includes a notch filter that has a state observer unit and a parameter adaptation unit. The state observer unit is configured to receive a sampled noisy electrical signal and a sampled filtered electrical signal, the state observer unit having an estimated noise signal output, the estimated noise signal output carrying an estimated noise signal to be subtracted from the sampled noisy electrical signal, resulting in the filtered electrical signal. The parameter adaptation unit is configured to receive the estimated noise signal and an error signal from the state observer unit. The parameter adaptation unit is also configured to determine, based on the estimated noise signal and the error signal, an updated estimated noise frequency, thereby causing the state observer unit to generate an updated estimated noise signal to be provided on the estimated noise signal output.

    Abstract translation: 一种装置包括具有状态观察单元和参数适配单元的陷波滤波器。 状态观察器单元被配置为接收采样的噪声电信号和采样的滤波电信号，状态观测器单元具有估计的噪声信号输出，所估计的噪声信号输出承载要从采样的噪声电信号中减去的估计噪声信号 ，导致滤波后的电信号。 参数适配单元被配置为从状态观察器单元接收估计的噪声信号和误差信号。 参数调整单元还被配置为基于所估计的噪声信号和误差信号来确定更新的估计噪声频率，从而使状态观察器单元产生要在估计的噪声信号输出上提供的更新的估计噪声信号。

    VISION SCREENING SYSTEMS AND METHODS
    7.
    发明申请
    VISION SCREENING SYSTEMS AND METHODS 有权

    公开(公告)号：US20220076417A1

    公开(公告)日：2022-03-10

    申请号：US17531320

    申请日：2021-11-19

    Applicant: Welch Allyn, Inc.

    Inventor： Edward Charles Bremer ,  Yaolong Lou

    IPC: G06T7/00 ,  A61B3/00 ,  G06K9/00

    Abstract: A system includes system housing, an eccentric radiation source, and a radiation sensor. The radiation produced by the eccentric radiation source can be collected by the radiation sensor to generate images of retinas for a patient. The system also includes a vision screening device connected with the eccentric radiation source and the radiation sensor via the system house that can control and synchronize actions for the eccentric radiation source and the radiation sensor. The vision screening device further analyzes the images generated by the radiation sensor via neural network algorithms to determine spherical error slopes, refractive errors, and recommendations for the patient.

    VISION SCREENING SYSTEMS AND METHODS
    8.
    发明申请
    VISION SCREENING SYSTEMS AND METHODS 有权

    公开(公告)号：US20210393120A1

    公开(公告)日：2021-12-23

    申请号：US17344838

    申请日：2021-06-10

    Applicant: Welch Allyn, Inc.

    Inventor： Yaolong Lou ,  Yuan Ing Chow ,  Shadakshari Devarajaiah Chikkanaravangala

    IPC: A61B3/103 ,  A61B3/00 ,  A61B3/14 ,  G16H30/40

    Abstract: A system includes system housing, an eccentric radiation source, and a radiation sensor. The radiation produced by the eccentric radiation source can be collected by the radiation sensor to generate images of retinas for a patient. The system also includes a vision screening device connected with the eccentric radiation source and the radiation sensor via the system house that can control and synchronize actions for the eccentric radiation source and the radiation sensor. The vision screening device further analyzes the images generated by the radiation sensor via neural network algorithms to determine spherical error slopes, refractive errors, and recommendations for the patient.

    FREQUENCY-ADAPTIVE NOTCH FILTER
    9.
    发明申请
    FREQUENCY-ADAPTIVE NOTCH FILTER 有权
    频率自适应滤波器

    公开(公告)号：US20160043704A1

    公开(公告)日：2016-02-11

    申请号：US14921039

    申请日：2015-10-23

    Applicant: Welch Allyn, Inc.

    Inventor： Yaolong Lou ,  Yong Sern Gwee ,  Peter Glocker

    IPC: H03H21/00 ,  A61B5/04 ,  A61B5/00 ,  A61B5/0402

    CPC classification number: H03H21/0021 ,  A61B5/04017 ,  A61B5/0402 ,  A61B5/7203 ,  A61B5/725 ,  A61B2560/0475

    Abstract: One apparatus includes a notch filter that has a state observer unit and a parameter adaptation unit. The state observer unit is configured to receive a sampled noisy electrical signal and a sampled filtered electrical signal, the state observer unit having an estimated noise signal output, the estimated noise signal output carrying an estimated noise signal to be subtracted from the sampled noisy electrical signal, resulting in the filtered electrical signal. The parameter adaptation unit is configured to receive the estimated noise signal and an error signal from the state observer unit. The parameter adaptation unit is also configured to determine, based on the estimated noise signal and the error signal, an updated estimated noise frequency, thereby causing the state observer unit to generate an updated estimated noise signal to be provided on the estimated noise signal output.

    Abstract translation: 一种装置包括具有状态观察单元和参数适配单元的陷波滤波器。 状态观察器单元被配置为接收采样的噪声电信号和采样的滤波电信号，状态观测器单元具有估计的噪声信号输出，所估计的噪声信号输出承载要从采样的噪声电信号中减去的估计噪声信号 ，导致滤波后的电信号。 参数适配单元被配置为从状态观察器单元接收估计的噪声信号和误差信号。 参数调整单元还被配置为基于所估计的噪声信号和误差信号来确定更新的估计噪声频率，从而使状态观察器单元产生要在估计的噪声信号输出上提供的更新的估计噪声信号。

    Frequency-adaptive notch filter
    10.
    发明授权
    Frequency-adaptive notch filter 有权

    公开(公告)号：US09503056B2

    公开(公告)日：2016-11-22

    申请号：US14921039

    申请日：2015-10-23

    Applicant: Welch Allyn, Inc.

    Inventor： Yaolong Lou ,  Yong Sern Gwee ,  Peter Glocker

    IPC: G06F17/10 ,  H03H21/00 ,  A61B5/0402 ,  A61B5/00 ,  A61B5/04

    CPC classification number: H03H21/0021 ,  A61B5/04017 ,  A61B5/0402 ,  A61B5/7203 ,  A61B5/725 ,  A61B2560/0475

    Abstract: One apparatus includes a notch filter that has a state observer unit and a parameter adaptation unit. The state observer unit is configured to receive a sampled noisy electrical signal and a sampled filtered electrical signal, the state observer unit having an estimated noise signal output, the estimated noise signal output carrying an estimated noise signal to be subtracted from the sampled noisy electrical signal, resulting in the filtered electrical signal. The parameter adaptation unit is configured to receive the estimated noise signal and an error signal from the state observer unit. The parameter adaptation unit is also configured to determine, based on the estimated noise signal and the error signal, an updated estimated noise frequency, thereby causing the state observer unit to generate an updated estimated noise signal to be provided on the estimated noise signal output.

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