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    Dual-energy ray imaging methods and systems
    92.
    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
    93.
    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
    97.
    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.

    Sampling device and gas curtain guide
    98.
    发明授权
    Sampling device and gas curtain guide 有权

    公开(公告)号：US10151671B2

    公开(公告)日：2018-12-11

    申请号：US15238598

    申请日：2016-08-16

    Applicant: Nuctech Company Limited

    Inventor： Qingjun Zhang ,  Yuanjing Li ,  Zhiqiang Chen ,  Huishao He ,  Qiufeng Ma ,  Ziran Zhao ,  Yinong Liu ,  Yaohong Liu ,  Weiping Zhu ,  Xiang Zou ,  Jianping Chang

    IPC: G01N1/24 ,  G01N30/30 ,  G01N1/22

    Abstract: A sampling device and a gas curtain guide are disclosed. In one aspect, the sampling device includes a chamber body. The chamber body includes a sample inlet, located at a first end of the chamber body, configured for suction of a sample. The chamber body further includes a sample outlet, located adjacent to a second end opposite to the first end of the chamber body, configured to discharge the sample. The chamber body further includes a gas inflation inlet, in a wall of the chamber body, configured to introduce a swirl gas flow into the chamber body. The chamber body further includes a gas exhaust opening configured to discharge gas so as to, together with the gas inflation inlet, generate a tornado type gas flow in the chamber body, which moves spirally from the first end to the second end of the chamber body.

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