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    Displacement detection device with no hovering function and computer system including the same
    11.
    发明授权
    Displacement detection device with no hovering function and computer system including the same 有权
    无悬停功能的位移检测装置和包含相同的计算机系统

    公开(公告)号：US09310903B2

    公开(公告)日：2016-04-12

    申请号：US14100120

    申请日：2013-12-09

    Applicant: PIXART IMAGING INC.

    Inventor： Willie Song ,  Kevin Len-Li Lim

    IPC: G06F3/038 ,  G06F3/0354 ,  A63F13/213

    CPC classification number: G06F3/0383 ,  A63F13/213 ,  G06F3/0317 ,  G06F3/03543 ,  G06F2203/0381

    Abstract: A displacement detection device includes an image sensor, a processing unit and an output unit. The image sensor is configured to detect reflected light from a working surface to successively output image frames. The processing unit is configured to identify a hovering height and calculate a first axis displacement and a second axis displacement according to the image frames. The output unit is controlled by the processing unit to output a first ratio of the first axis displacement but not to output the second axis displacement when the hovering height is higher than a predetermined height.

    Abstract translation: 位移检测装置包括图像传感器，处理单元和输出单元。 图像传感器被配置为检测来自工作表面的反射光以连续地输出图像帧。 处理单元被配置为识别悬停高度并根据图像帧计算第一轴位移和第二轴位移。 输出单元由处理单元控制以输出第一轴位移的第一比例，但是当悬停高度高于预定高度时不输出第二轴位移。

    Sensor, clock frequency adjusting system and method thereof
    12.
    发明授权
    Sensor, clock frequency adjusting system and method thereof 有权
    传感器，时钟频率调节系统及其方法

    公开(公告)号：US09025712B2

    公开(公告)日：2015-05-05

    申请号：US13953800

    申请日：2013-07-30

    Applicant: Pixart Imaging Inc.

    Inventor： Kevin Len-Li Lim

    IPC: H04L7/00 ,  G06F3/0354 ,  H03L7/00

    CPC classification number: G06F3/03543 ,  G06F1/12 ,  G06F3/038 ,  H03L7/00 ,  H03L7/08

    Abstract: A clock frequency adjusting system is disclosed. The clock frequency adjusting system includes a sensing clock generating unit, a frequency-dividing unit and a controller. The frequency-dividing unit makes frequency of the sensing clock signal be divided by a frequency-dividing modulus and then outputs a clock calibration signal. The controller includes a period counter and a frequency adjusting unit. The period counter samples the clock calibration signal through the external clock signal so as to acquire a second count value. The frequency adjusting unit calculates a frequency difference data between the clock calibration signal and the predetermined clock signal according to the first count value and the second count value, and determines a number of adjustment according to the frequency difference data and a step adjusting frequency so as to output a clock adjusting signal to the sensing clock unit to adjust frequency of the sensing clock signal.

    Abstract translation: 公开了一种时钟频率调节系统。 时钟频率调整系统包括感测时钟发生单元，分频单元和控制器。 分频单元使感测时钟信号的频率除以分频模数，然后输出时钟校准信号。 该控制器包括一个周期计数器和一个频率调节单元。 周期计数器通过外部时钟信号对时钟校准信号进行采样，以获得第二计数值。 所述频率调整单元根据所述第一计数值和所述第二计数值，计算所述时钟校准信号与所述规定时钟信号之间的频率差数据，并且根据所述频率差数据和阶跃调整频率来确定调整次数，以便 向感测时钟单元输出时钟调整信号，以调整感测时钟信号的频率。

    Pointing method and pointing device
    13.
    发明授权
    Pointing method and pointing device 有权

    公开(公告)号：US12236019B2

    公开(公告)日：2025-02-25

    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: G06F3/0354 ,  G06F3/03 ,  G06F3/038 ,  G06F3/041

    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.

    Security camera and motion detecting method for security camera
    19.
    发明授权
    Security camera and motion detecting method for security camera 有权

    公开(公告)号：US11893753B2

    公开(公告)日：2024-02-06

    申请号：US16937612

    申请日：2020-07-24

    Applicant: PixArt Imaging Inc.

    Inventor： Kevin Len-Li Lim ,  Joon Chok Lee ,  Zi Hao Tan ,  Ching Geak Chan ,  Keen-Hun Leong

    IPC: G06T7/20 ,  H04N7/18 ,  G06T7/254 ,  G06T7/246

    CPC classification number: G06T7/254 ,  G06T7/248 ,  H04N7/18

    Abstract: A security camera with a motion detection function, which comprises: an image sensor, configured to capture original images; a variation level computation circuit, configured to compute image variation levels of the original images; a long term computation circuit, configured to calculate a first average level for the image variation levels corresponding to M of the original images; a short term computation circuit, configured to calculate a second average level for the image variation levels corresponding to N of the original images, wherein M>N; and a motion determining circuit, configured to determine whether a motion of an object appears in a detection range of the image sensor according to a relation between the first average level and the second average level. By such security camera, the interference caused by noise or small object can be avoided. Accordingly, the motion detection of the security camera can be more accurate.

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