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    QUANTIFYING GAS LEAK RATES USING FRAME IMAGES ACQUIRED BY A CAMERA
    2.
    发明申请
    QUANTIFYING GAS LEAK RATES USING FRAME IMAGES ACQUIRED BY A CAMERA 审中-公开

    公开(公告)号：US20190154536A1

    公开(公告)日：2019-05-23

    申请号：US16099648

    申请日：2017-06-21

    Applicant: Konica Minolta Laboratory U.S.A., Inc.

    Inventor： Leiming Wang

    IPC: G01M3/04 ,  G01M3/38 ,  G01M3/00 ,  G01N21/3504 ,  G01J5/00 ,  H04N5/33

    Abstract: A method of quantifying gas leak rate includes receiving image frames acquired with a camera and including a plume from a gas leak source, determining a real-world size that each pixel represents, identifying pixels corresponding to the plume in a first image frame, calculating gas concentration path lengths of the plume for the pixels in the first image frame, calculating, based on the first image frame and a second image frame, an image velocity field of the plume including displacement vectors for the pixels, identifying, within the first image, a closed boundary enclosing the gas leak source of the plume, and calculating a first gas leak rate in the first image frame by calculating a volume rate of the plume flowing across the closed boundary based on the image velocity field, the gas concentration path lengths, and a time interval between the first and the second image frames.

    TERAHERTZ SPECTRAL IMAGING SYSTEM AND SECURITY SURVEILLANCE SYSTEM EMPLOYING THE SAME
    3.
    发明申请
    TERAHERTZ SPECTRAL IMAGING SYSTEM AND SECURITY SURVEILLANCE SYSTEM EMPLOYING THE SAME 审中-公开

    公开(公告)号：US20180364158A1

    公开(公告)日：2018-12-20

    申请号：US15628566

    申请日：2017-06-20

    Applicant: KONICA MINOLTA LABORATORY U.S.A., INC.

    Inventor： Leiming Wang ,  Jun Amano

    IPC: G01N21/3581 ,  G06K9/00 ,  G01J3/12

    CPC classification number: G01N21/3581 ,  G01J3/108 ,  G01J3/1256 ,  G01J2003/423 ,  G06K9/0063

    Abstract: A terahertz (THz) spectral imaging system includes a THz 2D imaging camera, a tunable THz bandpass filter before the THz camera, and a broadband THz light source. The tunable THz bandpass filter includes a visible or infrared laser source, a spatial light modulator modulating the light to generate a spatially structured light pattern, and a semiconductor plate onto which the light pattern is projected. The light pattern generates carriers in the semiconductor plate to turn it into a metamaterial THz bandpass filter, which is tunable by changing the light patterns. A controller controls the light patterns and the THz camera in a timing sequence to acquire multiple 2D THz images at different THz frequencies. Such THz spectral image data can be further combined with visible images and LiDAR images in a security surveillance system to automatically detect security threats using image fusion and deep learning techniques.

    MULTI-SPECTRAL GAS QUANTIFICATION AND DIFFERENTIATION METHOD FOR OPTICAL GAS IMAGING CAMERA
    5.
    发明申请
    MULTI-SPECTRAL GAS QUANTIFICATION AND DIFFERENTIATION METHOD FOR OPTICAL GAS IMAGING CAMERA 审中-公开

    公开(公告)号：US20190302013A1

    公开(公告)日：2019-10-03

    申请号：US15942097

    申请日：2018-03-30

    Applicant: Konica Minolta Laboratory U.S.A., Inc.

    Inventor： Leiming Wang

    IPC: G01N21/3518 ,  G01N21/31

    Abstract: A gas concentration-length quantification method may include: acquiring a multi-spectral image of detected radiance including a plurality of pixels using a multi-spectral optical gas imaging camera; estimating a background radiance for at least one of the pixels; calculating a gas concentration-length for the at least one of the pixels based on the detected radiance and the estimated background radiance; and triggering an alert when each alert condition in a list of alert conditions is satisfied. A multi-spectral configuration of the camera may include a reference band that is outside an absorption window of a target gas and an active band that includes at least a portion of the absorption window. Estimating the background radiance may include determining a model relating a detected radiance of the active band to a detected radiance of the reference band and using the model to estimate the background radiance for the active band.

    Background radiance estimation and gas concentration-length quantification method for optical gas imaging camera
    6.
    发明授权
    Background radiance estimation and gas concentration-length quantification method for optical gas imaging camera 有权

    公开(公告)号：US10359359B2

    公开(公告)日：2019-07-23

    申请号：US16263576

    申请日：2019-01-31

    Applicant: Konica Minolta Laboratory U.S.A., Inc.

    Inventor： Leiming Wang ,  Ting Xu

    IPC: G01N21/3504 ,  G01M3/38

    Abstract: A gas concentration-length quantification method, including: acquiring a first image including a gas plume with a camera; identifying and segmenting pixels corresponding to the gas plume in the first image; generating a background image corresponding to the first image using an image inpainting algorithm with the first image and positional information of the segmented pixels corresponding to the gas plume as inputs; calculating a gas concentration-length for each pixel corresponding to the gas plume in the first image, based on the first image and the background image data; and triggering an alert when the gas concentration-length for at least one pixel exceeds a threshold level.

    Terahertz spectral imaging system and security surveillance system employing the same
    9.
    发明授权
    Terahertz spectral imaging system and security surveillance system employing the same 有权

    公开(公告)号：US10234383B2

    公开(公告)日：2019-03-19

    申请号：US15628566

    申请日：2017-06-20

    Applicant: KONICA MINOLTA LABORATORY U.S.A., INC.

    Inventor： Leiming Wang ,  Jun Amano

    IPC: G01N21/35 ,  G01N21/3581 ,  G06K9/00 ,  G01J3/12 ,  G01J3/10 ,  G01J3/42

    Abstract: A terahertz (THz) spectral imaging system includes a THz 2D imaging camera, a tunable THz bandpass filter before the THz camera, and a broadband THz light source. The tunable THz bandpass filter includes a visible or infrared laser source, a spatial light modulator modulating the light to generate a spatially structured light pattern, and a semiconductor plate onto which the light pattern is projected. The light pattern generates carriers in the semiconductor plate to turn it into a metamaterial THz bandpass filter, which is tunable by changing the light patterns. A controller controls the light patterns and the THz camera in a timing sequence to acquire multiple 2D THz images at different THz frequencies. Such THz spectral image data can be further combined with visible images and LiDAR images in a security surveillance system to automatically detect security threats using image fusion and deep learning techniques.

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