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    VEHICLE INSPECTION METHOD AND SYSTEM
    1.
    发明公开
    VEHICLE INSPECTION METHOD AND SYSTEM 审中-公开

    公开(公告)号：EP4160274A1

    公开(公告)日：2023-04-05

    申请号：EP21812904.7

    申请日：2021-05-24

    申请人： Nuctech Company Limited ,  Tsinghua University

    发明人： CHEN, Zhiqiang ,  ZHANG, Li ,  LI, Yuanjing ,  XING, Yuxiang ,  SHI, Jie

    IPC分类号： G01V5/00

    摘要： A method for inspecting a vehicle includes: acquiring a to-be-inspected image of an inspected vehicle (S11); acquiring a visual feature of the to-be-inspected image using a first neural network model (S12); retrieving a template image from a vehicle template library based on the visual feature of the to-be-inspected image (S13); determining a variation region between the to-be-inspected image and the template image (S14); and presenting the variation region to a user (S15). The system for inspecting a vehicle includes a radiation imaging device (150), a display device (130), an image processor (140), and a storage device (120). The present disclosure further includes a computer-readable storage medium.

    IMAGE PROCESSING METHOD, IMAGE PROCESSING DEVICE AND STORAGE MEDIUM
    2.
    发明公开
    IMAGE PROCESSING METHOD, IMAGE PROCESSING DEVICE AND STORAGE MEDIUM 审中-公开

    公开(公告)号：EP3506209A1

    公开(公告)日：2019-07-03

    申请号：EP18215939.2

    申请日：2018-12-31

    申请人： Tsinghua University ,  Nuctech Company Limited

    发明人： XING, Yuxiang ,  LIANG, Kaichao ,  SHEN, Le ,  ZHANG, Li ,  YANG, Hongkai ,  KANG, Kejun ,  CHEN, Zhiqing ,  LI, Jianmin ,  LIU, Yinong

    IPC分类号： G06T11/00

    摘要： An image processing method, an image processing device and a storage medium are disclosed. The image processing method includes processing input projection domain data using a convolutional neural network. The neural network includes a projection domain network, an analytical reconstruction network layer and an image domain network. The projection domain network may process the projection domain data to recover possible missing data, thereby improving quality of the projection. The image domain network processes a reconstructed image to obtain an estimated image. The image domain network is adjusted by using an a priori model cost function based on the estimated image, and back propagation of a gradient is performed through the analytical reconstruction network layer to adjust parameters of a convolutional kernel of the projection domain network. A projection operation is performed on the estimated image by using a system projection matrix of the CT scanning system to obtain a projection result.

    IMAGING SYSTEM USING A STRAIGHT-LINE TRAJECTORY SCAN AND METHOD THEREOF
    3.
    发明授权
    IMAGING SYSTEM USING A STRAIGHT-LINE TRAJECTORY SCAN AND METHOD THEREOF 有权

    公开(公告)号：EP2273257B1

    公开(公告)日：2018-11-21

    申请号：EP09733473.4

    申请日：2009-04-01

    申请人： Tsinghua University ,  Nuctech Company Limited

    发明人： ZHANG, Li ,  LIU, Yinong ,  CHEN, Zhiqiang ,  LI, Yuanjing ,  GAO, Hewei ,  XING, Yuxiang ,  ZHAO, Ziran ,  XIAO, Yongshun

    IPC分类号： G01N23/04 ,  G01V5/00

    CPC分类号： G01V5/005 ,  G01B15/00 ,  G01V5/0016 ,  G03B42/00

    摘要： A linear track scanning imaging system and method, the imaging system comprising: a ray generating unit comprising a plurality of ray sources, where the plurality of ray sources emit beams alternately and only one ray source emits a beam at a same time; an actuating means for causing an object under examination to perform a relative movement with respect to the linear track scanning system along a linear track, thereby leading the object under examination to pass through the scanning area of the linear track scanning imaging system; a data collecting unit which collects the projection data of the object under examination for each ray source respectively; an imaging unit which reconstructs an image of the object under examination based on the projection data collected for each ray source; and a display unit for displaying the reconstructed image. By adopting a plurality of ray sources arranged according to a certain spatial distribution and emitting beams alternately according to a certain time sequence, it is possible to achieve a larger scanning viewing angle with a shorter detector length, thereby reducing the number of the detector units required by the system and shortening the total scanning distance of the examined object.

    SCANNING IMAGING SYSTEM FOR SECURITY INSPECTION OF AN OBJECT AND IMAGING METHOD THEREOF
    5.
    发明公开
    SCANNING IMAGING SYSTEM FOR SECURITY INSPECTION OF AN OBJECT AND IMAGING METHOD THEREOF 审中-公开

    公开(公告)号：EP3460531A1

    公开(公告)日：2019-03-27

    申请号：EP18178449.7

    申请日：2018-06-19

    申请人： Nuctech Company Limited ,  Tsinghua University

    发明人： ZHANG, Li ,  CHEN, Zhiqiang ,  SHEN, Le ,  HUANG, Qingping ,  SUN, Yunda ,  JIN, Xin ,  DING, Hui ,  XING, Yuxiang

    IPC分类号： G01V5/00

    摘要： A scanning imaging system for security inspection of an object and an imaging method thereof are disclosed, the system comprising: a conveying unit (101) configured for bringing the object to move along a conveying direction; a plurality of radiographic sources (102) at one side of the conveying unit, being arranged successively in a direction vertical to a plane, in which the conveying unit is located, configured for alternately emitting ray beams to form a scanning area; a linear detector array (103) at the other side of the conveying unit, being configured for detecting first projection images, which are formed after the ray beams emitted by the plurality of radiographic sources penetrate through the object, in the process of the object passing through the scanning area; an imaging unit configured for obtaining a first reconstructed image of the object based on the first projection images of the plurality of radiographic sources.

    PHASE CONTRAST IMAGING METHOD AND APPARATUS
    8.
    发明授权
    PHASE CONTRAST IMAGING METHOD AND APPARATUS 有权
    VEFAHREN和设备相衬成像

    公开(公告)号：EP2256477B1

    公开(公告)日：2012-08-01

    申请号：EP09717946.9

    申请日：2009-02-16

    申请人： Tsinghua University ,  Nuctech Company Limited

    发明人： KANG, Kejun ,  CHEN, Zhiqiang ,  ZHANG, Li ,  WANG, Yingxin ,  ZHAO, Ziran ,  LI, Yuanjing ,  LIU, Yinong ,  HUANG, Zhifeng ,  XING, Yuxiang

    IPC分类号： G01N21/35

    CPC分类号： G01N21/3581

    摘要： A phase contrast imaging method comprises: using a Terahertz radiation to radiate an object in order to interact with the object; making the Terahertz radiation after interacting with the object radiating a diffraction grating; shifting the diffraction grating along the diffraction grating wave vector direction in order to measure the light intensity distribution of the Terahertz radiation after interacting with the object and the grating in the diffraction field for the different grating positions; and recovering a phase contrast image of the object based on the light intensity distribution. Besides, a phase contrast imaging apparatus comprises: a Terahertz radiation emitter(1), which produces the Terahertz radiation to radiate an object in order to interact with the object; a diffraction grating(3), which is radiated by the Terahertz radiation after interacting with the object; a Terahertz radiation detector(4), which measures the light intensity distribution of the Terahertz radiation after interacting with the object and the grating in the diffraction field for the different grating positions; a data collecting and processing system(6), which recovers a phase contrast image of the object based on the light intensity distribution.

    METHOD AND DEVICE FOR DETECTING LIQUID ARTICLE
    9.
    发明公开
    METHOD AND DEVICE FOR DETECTING LIQUID ARTICLE 有权
    VERFAHREN UND VORRICHTUNG ZUM NACHWEISEN EINESFLÜSSIGENARTIKELS

    公开(公告)号：EP2189785A1

    公开(公告)日：2010-05-26

    申请号：EP08800646.5

    申请日：2008-09-25

    申请人： Tsinghua University ,  Nuctech Company Limited

    发明人： ZHANG, Li ,  CHEN, Zhiqiang ,  WANG, Xuewu ,  HU, Haifeng ,  WU, Hongxin ,  LI, Yuanjing ,  LIU, Yinong ,  ZHAO, Ziran ,  XING, Yuxiang ,  TANG, Hu ,  YI, Yumin ,  ZHANG, Jinyu

    IPC分类号： G01N23/04 ,  G01N23/083

    CPC分类号： G01N9/24 ,  G01V5/00

    摘要： Disclosed are a method and a device for security-inspection of liquid articles with dual-energy CT imaging. The method comprises the steps of obtaining one or more CT images including physical attributes of liquid article to be inspected by CT scanning and a dual-energy reconstruction method; acquiring the physical attributes of each liquid article from the CT image; and determining whether the inspected liquid article is dangerous based on the physical attributes. The CT scanning can be implemented by a normal CT scanning technique, or a spiral CT scanning technique. In the normal CT scanning technique, the scan position can be preset, or set by the operator with a DR image, or set by automatic analysis of the DR image.

    摘要翻译： 公开了用于双能CT成像的液体物品的安全检查的方法和装置。 该方法包括以下步骤：通过CT扫描获得包括要检查的液体物品的物理属性的一个或多个CT图像和双能量重建方法; 从CT图像获取每个液体物品的物理属性; 并根据物理属性确定被检液体是否危险。 CT扫描可以通过正常的CT扫描技术或螺旋CT扫描技术来实现。 在正常的CT扫描技术中，扫描位置可以由操作员预先设置，也可以通过DR图像进行设置，或者通过DR图像的自动分析设置。

    X-RAY DETECTION METHOD AND X-RAY DETECTOR
    10.
    发明公开
    X-RAY DETECTION METHOD AND X-RAY DETECTOR 审中-公开

    公开(公告)号：EP3454048A1

    公开(公告)日：2019-03-13

    申请号：EP17792367.9

    申请日：2017-02-03

    申请人： Tsinghua University ,  Nuctech Company Limited

    发明人： XING, Yuxiang ,  GUO, Xiaoyue ,  DENG, Zhi ,  SHEN, Le ,  ZHANG, Li ,  CHEN, Zhiqiang ,  LI, Liang

    IPC分类号： G01N23/04

    摘要： An X-ray detection method and an X-ray detector are provided. The X-ray detection method according to embodiments of the present disclosure includes: dividing an energy range of photons emitted by an X-ray source into a number N of energy windows, where N is an integer greater than 0; obtaining a weighting factor for each of the number N of energy windows based on linear attenuation coefficients of a substance of interest and a background substance of an imaging target; obtaining a weighting factor matrix for M output channels of an X-ray detector based on the weighting factor for each of the number N of energy windows, where M is an integer greater than 0; and obtaining output results of the M output channels based on the weighting factor matrix and numbers of photons having an energy range falling into individual energy windows of the number N of energy windows.