公开(公告)号：US10769821B2

公开(公告)日：2020-09-08

申请号：US16045383

申请日：2018-07-25

Applicant: NUCTECH COMPANY LIMITED ,  Tsinghua University

Inventor： Yuxiang Xing ,  Li Zhang ,  Jianmin Li ,  Zhiqiang Chen ,  Jianping Gu

IPC: G06T5/20 ,  G06T11/00 ,  G06T5/00 ,  G06T3/40 ,  G06N3/04

Abstract: A method and device for reconstructing a CT image and a storage medium are disclosed. CT scanning is performed on an object to be inspected to obtain projection data on a first scale. Projection data on a plurality of other scales is generated from the projection data on the first scale. Projection data on each scale is processed on the corresponding scale by using a first convolutional neural network to obtain processed projection data, and a back-projection operation is performed on the processed projection data to obtain a CT image on the corresponding scale. CT images on the plurality of scales are fused to obtain a reconstructed image of the object to be inspected.

公开(公告)号：US20180059262A1

公开(公告)日：2018-03-01

申请号：US15609476

申请日：2017-05-31

Applicant: NUCTECH COMPANY LIMITED

Inventor： Lan ZHANG ,  Yingshuai Du ,  Bo Li ,  Zonggui Wu ,  Jun Li ,  Xuepeng Cao ,  Haifan Hu ,  Jianping Gu ,  Guangming Xu ,  Bicheng Liu

IPC: G01T1/24 ,  H01L31/0224 ,  H01L31/032

CPC classification number: G01T1/24 ,  G01T1/241 ,  H01L31/022408 ,  H01L31/0324

Abstract: A semiconductor may include a semiconductor detection material including a first side and a second side opposite to each other, a cathode disposed on the first side, and an anode disposed on the second side. The anode includes an array of pixel anodes defining detection pixels of the semiconductor detector, and intermediate anodes disposed between adjacent ones of the pixel anodes. According to an embodiment of the present disclosure, it is possible to achieve signal correction to improve the energy resolution and the signal-to-noise ratio of the detector.

公开(公告)号：US09557436B2

公开(公告)日：2017-01-31

申请号：US14138447

申请日：2013-12-23

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Zhiqiang Chen ,  Li Zhang ,  Ziran Zhao ,  Qiang Li ,  Jianping Gu ,  Qingping Huang

IPC: G06T17/00 ,  G01V5/00 ,  G06T7/00 ,  G06K9/00

CPC classification number: G01V5/005 ,  G06K9/00214 ,  G06K2209/09 ,  G06T7/11 ,  G06T7/187 ,  G06T17/00 ,  G06T2207/10081 ,  G06T2207/30112

Abstract: Disclosed are methods and apparatuses for creating a 3-Dimensional model for objects in an inspected luggage in a CT system. The method includes acquiring slice data of the luggage with the CT system; interpolating the slice data to generate 3D volume data of the luggage; performing unsupervised segmentation on the 3D volume data of the luggage to obtain a plurality of segmental regions; performing isosurface extraction on the plurality of segmental regions to obtain corresponding isosurfaces; and performing 3D surface segmentation on the isosurfaces to form a 3D model for the objects in the luggage. The above solutions can create a 3D model for objects in the inspected luggage in a relatively accurate manner, and thus provide better basis for subsequent shape feature extraction and security inspection, and reduce omission factor.

Abstract translation: 公开了用于在CT系统中检查的行李中的物体创建三维模型的方法和装置。 该方法包括采用CT系统获取行李的切片数据; 内插切片数据以生成行李的3D体积数据; 对行李的3D体积数据执行无监督分割以获得多个分段区域; 在多个分段区域进行等值面提取以获得相应的等值面; 并在等面上执行3D表面分割，以形成行李中物体的3D模型。 上述解决方案可以以相对准确的方式为被检查行李中的对象创建3D模型，从而为随后的形状特征提取和安全检查提供更好的依据，并减少遗漏因素。

公开(公告)号：US09250180B2

公开(公告)日：2016-02-02

申请号：US14495233

申请日：2014-09-24

Applicant: Nuctech Company Limited ,  Tsinghua University

Inventor： Zhiqiang Chen ,  Li Zhang ,  Jianhong Zhang ,  Hongqiu Wang ,  Ziran Zhao ,  Yumin Yi ,  Jianping Gu ,  Qingping Huang

IPC: G01J3/44 ,  G01N21/47 ,  G01N33/15 ,  G01N21/65

CPC classification number: G01N21/47 ,  G01J3/44 ,  G01N21/65 ,  G01N21/658 ,  G01N33/15

Abstract: A raman spectrum measuring method for drug inspection is provided, comprising: measuring raman spectrum of a sample to be inspected to acquire an original raman spectrum curve of the sample; determining whether the original raman spectrum curve has a characterizing portion, and if not, measuring a mixture of the sample and an enhancing agent to acquire an enhanced raman spectrum curve of the sample; and if the original raman spectrum curve of the sample to be inspected has a characterizing portion, comparing the original raman spectrum curve of the sample with data in an original raman spectrum database of a drug to determine whether the sample contains the drug, otherwise, comparing the enhanced raman spectrum curve of the sample with data in an enhanced raman spectrum database of the drug to determine whether the sample to be inspected contains the drug.

Abstract translation: 提供了用于药物检查的拉曼光谱测量方法，包括：测量被检样品的拉曼光谱以获得样品的原始拉曼光谱曲线; 确定原始拉曼光谱曲线是否具有特征部分，如果不是，则测量样品和增强剂的混合物以获得样品的增强的拉曼光谱曲线; 如果要检查的样本的原始拉曼光谱曲线具有特征部分，则将样品的原始拉曼光谱曲线与药物的原始拉曼光谱数据库中的数据进行比较，以确定样品是否含有药物，否则比较 增强的拉曼光谱曲线的样品与增强的拉曼光谱数据库中的数据，以确定待检样品是否含有药物。

公开(公告)号：US08891081B1

公开(公告)日：2014-11-18

申请号：US14145454

申请日：2013-12-31

Applicant: Nuctech Company Limited ,  Tsinghua University

Inventor： Zhiqiang Chen ,  Li Zhang ,  Jianhong Zhang ,  Hongqui Wang ,  Ziran Zhao ,  Jianping Gu ,  Zhiming Wang ,  Qingping Huang ,  Yumin Yi

IPC: G01J3/44 ,  G01N21/65

CPC classification number: G01N21/65

Abstract: A raman spectroscopy method of measuring melamine contents in dairy products having different matrixes. The method includes: (a) establishing a database of characteristic curves of dairy products having different matrixes; (b) taking several copies of the dairy products having one certain unknown matrix and adding melamine standard solutions having different concentrations therein, to obtain a series of dairy product samples in which the relative concentrations of the melamine are known; (c) performing raman spectrum testing analysis and obtaining corresponding characteristic peak intensities to obtain a slope of the characteristic curve showing variation of the characteristic peak intensities with the relative concentrations of the melamine; (d) searching the database of step (a) using the slope of the characteristic curve of the dairy product samples to find a matching characteristic curve, and (e) calculating concentration of melamine in the dairy products by using the matched characteristic curve and the characteristic peak intensity.

Abstract translation: 测量具有不同基质的乳制品中三聚氰胺含量的拉曼光谱法。 该方法包括：（a）建立具有不同矩阵的乳制品特征曲线数据库; （b）取几份具有一定未知基质的乳制品，并加入其中浓度不同的三聚氰胺标准溶液，以获得其中已知三聚氰胺的相对浓度的一系列乳制品样品; （c）进行拉曼光谱测试分析并获得相应的特征峰强度，以获得特征曲线的斜率，显示特征峰强度与三聚氰胺的相对浓度的变化; （d）使用乳制品样品的特征曲线的斜率来搜索步骤（a）的数据库，以找到匹配的特征曲线，以及（e）通过使用匹配的特征曲线计算乳制品中三聚氰胺的浓度， 特征峰强度。

公开(公告)号：US20140185923A1

公开(公告)日：2014-07-03

申请号：US14136462

申请日：2013-12-20

Applicant: NUCTECH COMPANY LIMITED ,  TSINGHUA UNIVERSITY

Inventor： Zhiqiang Chen ,  Li Zhang ,  Ziran Zhao ,  Qingping Huang ,  Qiang Li ,  Jianping Gu ,  Yunda Sun

IPC: G06K9/00

CPC classification number: G06T7/596 ,  G06K9/00201 ,  G06K9/00523 ,  G06K9/00536 ,  G06K9/6215 ,  G06K9/627 ,  G06K2209/09 ,  G06T7/0004 ,  G06T7/68 ,  G06T11/008 ,  G06T2207/10081 ,  G06T2207/30112 ,  G06T2211/408

Abstract: Methods for extracting a shape feature of an object and security inspection methods and apparatuses. Use is made of CT's capability of obtaining a 3D structure. The shape of an object in an inspected luggage is used as a feature of a suspicious object in combination with a material property of the object. For example, a false alarm rate in detection of suspicious explosives may be reduced.

Abstract translation: 用于提取对象的形状特征的方法和安全检查方法和装置。 使用CT可以获得3D结构。 检查行李中的物体的形状被用作可疑物体的特征，与物体的材料属性相结合。 例如，可能会减少检测可疑炸药的误报率。

公开(公告)号：US10509979B2

公开(公告)日：2019-12-17

申请号：US16255738

申请日：2019-01-23

Applicant: NUCTECH COMPANY LIMITED

Inventor： Zhiqiang Chen ,  Li Zhang ,  Ziran Zhao ,  Yaohong Liu ,  Duokun Zhang ,  Jianping Gu ,  Qiang Li ,  Jian Zhang

IPC: G06K9/32 ,  G01V5/00 ,  G01N23/046

Abstract: An inspection method and system for inspecting whether there is any liquor in goods is provided. The method includes: acquiring a radiation image of goods being inspected; processing on the radiation image to obtain an ROI; inspecting on the ROI using a liquor goods inspection model to determine if the ROI of the radiation image contains liquor goods. The above solution performs liquor inspection on scanned images of goods, especially containers, so as to intelligently assist the image inspectors.

公开(公告)号：US10229336B2

公开(公告)日：2019-03-12

申请号：US15129389

申请日：2015-12-23

Applicant: NUCTECH COMPANY LIMITED

Inventor： Zhiqiang Chen ,  Li Zhang ,  Ziran Zhao ,  Yaohong Liu ,  Duokun Zhang ,  Jianping Gu ,  Qiang Li ,  Jian Zhang

IPC: G01V5/00 ,  G06K9/32 ,  G01N23/046

Abstract: An inspection method and system for inspecting whether there is any liquor in goods is provided. The method includes: acquiring a radiation image of goods being inspected; processing on the radiation image to obtain an ROI; inspecting on the ROI using a liquor goods inspection model to determine if the ROI of the radiation image contains liquor goods. The above solution performs liquor inspection on scanned images of goods, especially containers, so as to intelligently assist the image inspectors.

公开(公告)号：US10101473B2

公开(公告)日：2018-10-16

申请号：US15606071

申请日：2017-05-26

Applicant: Nuctech Company Limited

Inventor： Lan Zhang ,  Yingshuai Du ,  Bo Li ,  Zonggui Wu ,  Jun Li ,  Xuepeng Cao ,  Haifan Hu ,  Jianping Gu ,  Guangming Xu ,  Bicheng Liu

IPC: G01T1/24 ,  H01L31/02 ,  H05K1/18 ,  H05K1/02 ,  H05K1/11 ,  H01L31/119 ,  H01L31/0296

Abstract: The present disclosure provides a semiconductor detector. The semiconductor detector comprises: a detector crystal including a crystal body, an anode and a cathode; a field enhance electrode for applying a voltage to the detector crystal; an insulating material disposed between the field enhanced electrode and a surface of the detector crystal. The semiconductor detector further comprises a field enhanced electrode circuit board having a bottom connection layer in contact with the surface of the detector crystal and a top layer opposite to the bottom connection layer, wherein the top layer is connected to a high voltage input terminal of the semiconductor detector, and an insulating material is provided between the bottom connection layer and the detector surface of the detector crystal.

公开(公告)号：US20180196158A1

公开(公告)日：2018-07-12

申请号：US15868378

申请日：2018-01-11

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Gang Fu ,  Jun Zhang ,  Jianping Gu ,  Yaohong Liu ,  Ziran Zhao

IPC: G01V5/00 ,  G06T7/00

CPC classification number: G01V5/0016 ,  G06T7/001 ,  G06T2207/10116

Abstract: An inspection device and a method for detecting a firearm are disclosed. X-ray inspection is performed on an inspected object to obtain a transmission image. A plurality of candidate regions in the transmission image are determined using a trained firearm detection neural network. The plurality of candidate regions are classified using the firearm detection neural network to determine whether there is a firearm included in the transmission image. With the above solution, it is possible to determine more accurately whether there is a firearm included in a container/vehicle.