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    Scan method, scan system and radiation scan controller
    16.
    发明授权
    Scan method, scan system and radiation scan controller 有权

    公开(公告)号：US10578765B2

    公开(公告)日：2020-03-03

    申请号：US16253221

    申请日：2019-01-22

    Applicant: NUCTECH COMPANY LIMITED ,  TSINGHUA UNIVERSITY

    Inventor： Kejun Kang ,  Yaohong Liu ,  Ziran Zhao ,  Wei Jia ,  Jianping Gu ,  Chuanxiang Tang ,  Huaibi Chen ,  Jianjun Gao ,  Wei Yin ,  Xiying Liu

    IPC: G01V5/00 ,  G01T1/29 ,  G01N23/04

    Abstract: This invention provides a scan method, scan system and radiation scan controller, and relates to the field of radiation. The scanning method includes obtaining detection data of an object to be inspected under radiation scanning using a detector, adjusting an accelerator output beam dose rate and/or an output electron beam energy level of a radiation emission device according to the detection data. With this method, working conditions of the accelerator of the radiation emission device may be adjusted according to the detection data detected by the detector, so that for a region having a larger mass thickness, a higher output beam dose rate or a higher electron beam output energy level is adopted to guarantee satisfied imaging technical indexes, for a region having a smaller mass thickness, a lower output beam dose rate or a lower electron beam output energy level is adopted to reduce the environmental dose level while guaranteeing satisfied imaging technical indexes.

    Dual-energy ray imaging methods and systems
    18.
    发明授权
    Dual-energy ray imaging methods and systems 有权

    公开(公告)号：US10339673B2

    公开(公告)日：2019-07-02

    申请号：US15129455

    申请日：2015-12-23

    Applicant: Tsinghua University ,  NUCTECH COMPANY LIMITED

    Inventor： Liang Li ,  Zhiqiang Chen ,  Kejun Kang ,  Li Zhang ,  Ziran Zhao ,  Yuxiang Xing ,  Yongshun Xiao ,  Jianping Gu ,  Juan Zheng

    IPC: G01N23/04 ,  G06T11/00 ,  G06T7/00

    Abstract: Disclosed is a dual-energy ray imaging method and system. The method comprises: calculating the mass thicknesses of the materials in the overlapped area of two materials by using a calibrated surface fitting method, and then decomposing a pair of original high-energy and low-energy data for this pixel into two high-low-energy data sets corresponding to the two materials, and finally calculating and acquiring the composition result of different materials for each pixel. The disclosure is especially advantageous in that the problem of error recognition of materials due to the two overlapped materials can be eliminated and the stratified imaging of multiple materials can be achieved, thereby improving the accuracy of the substance recognition and reducing the rate of false positive and false negative which is very important to the applications in the field of security check and anti-smuggling.

    Vehicle inspection methods and systems
    19.
    发明授权
    Vehicle inspection methods and systems 有权

    公开(公告)号：US10289699B2

    公开(公告)日：2019-05-14

    申请号：US15282134

    申请日：2016-09-30

    Applicant: Tsinghua University ,  Nuctech Company Limited

    Inventor： Zhiqiang Chen ,  Li Zhang ,  Ziran Zhao ,  Yaohong Liu ,  Jianping Gu ,  Zheng Hu ,  Qiang Li

    IPC: G06K9/00 ,  G06F17/30 ,  G01N23/04 ,  G06T7/00 ,  G06T7/33 ,  G06K9/42 ,  G06K9/62

    Abstract: A vehicle inspection method and system are disclosed. In one aspect, the method includes acquiring a transmission image of an inspected vehicle. The method further includes acquiring a transmission image template of a vehicle model corresponding to the model of the inspected vehicle from a database. The method further includes performing registration on the transmission image of the inspected vehicle and the transmission image template. The method further includes determining a difference between a transmission image after the registration and a transmission image template after the registration, to obtain a difference area of the transmission image of the vehicle relative to the transmission image template. The method further includes processing the difference area to determine whether the vehicle carries a suspicious object or not. In some embodiments, this solution can avoid the problems of a detection loophole and a poor effect of manually determining an image in a conventional manner, and is important to assist the security inspection for small vehicles.

    Method and system for estimating point spread function
    20.
    发明授权
    Method and system for estimating point spread function 有权

    公开(公告)号：US10152774B2

    公开(公告)日：2018-12-11

    申请号：US15217613

    申请日：2016-07-22

    Applicant: Tsinghua University ,  Nuctech Company Limited

    Inventor： Kejun Kang ,  Zhiqiang Chen ,  Yuanjing Li ,  Li Zhang ,  Ziran Zhao ,  Yaohong Liu ,  Jianping Gu ,  Zhiming Wang

    IPC: G06K9/00 ,  G06T5/00 ,  G06T7/77 ,  G06T7/44

    Abstract: The present disclosure relates to a method and device for estimating a point spread function. In one implementation, a method includes capturing, by a scanning device, an image by scanning a plurality of rectangle blocks which are same sized and closely arranged, wherein the plurality of rectangle blocks are made of different materials and/or have different mass thicknesses, and an incident direction of rays is perpendicular to a scanning direction and a surface of the plurality of rectangle blocks arranged closely during scanning; obtaining line spread functions for two directions along a length side and a width side of each of the rectangle blocks based on the scanned image, and obtaining standard deviation parameters of the line spread functions; and combining the standard deviation parameters for the two directions to obtain a two dimensional Point Spread Function (PSF) parameter so as to estimate the point spread function.

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