公开(公告)号：US10302578B2

公开(公告)日：2019-05-28

申请号：US15494884

申请日：2017-04-24

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Liang Li ,  Zhiqiang Chen ,  Kejun Kang ,  Li Zhang ,  Ziran Zhao ,  Yuxiang Xing ,  Jianmin Li ,  Yulan Li ,  Tiao Zhao

IPC: G01N23/046 ,  G01N23/087

Abstract: Methods and system for decomposing a high-energy dual-energy X-ray CT material are disclosed. In the method, two types of effect such as Compton effect and electron pairing effect which dominates are reserved and the influence of the other effect such a photoelectric effect is removed so as to improve the accuracy of the material decomposition. The unique advantage of the present disclosure is to effectively remove the error of the calculated atomic number Z due to directly selecting two effects during processes of material decomposition in the conventional dual-energy CT method. This may greatly improve the accuracy of dual-energy CT identification of the material, and it is important to improve the conventional dual-use CT imaging system applications, such as clinical therapy, security inspection, industrial non-destructive testing, customs anti-smuggling and other fields.

公开(公告)号：US10262410B2

公开(公告)日：2019-04-16

申请号：US15279664

申请日：2016-09-29

Applicant: NUCTECH COMPANY LIMITED

Inventor： Zhiqiang Chen ,  Li Zhang ,  Ziran Zhao ,  Yaohong Liu ,  Cun Cheng ,  Qiang Li ,  Jianping Gu ,  Jian Zhang ,  Gang Fu

IPC: G06T7/00 ,  G06K9/00 ,  G06K9/46 ,  G06Q30/00 ,  G06K9/32 ,  G06T7/11 ,  G06K9/18 ,  G06K9/62 ,  G06T7/136

Abstract: The present disclosure provides a method and a system for inspecting goods. The method includes the steps of: obtaining a transmission image and a HSCODE of inspected goods; processing the transmission image to obtain a region of interest; retrieving from a model library a model created based on the HSCODE, in accordance with the HSCODE of the inspected goods; and determining whether there are any goods not registered in a customs declaration that are contained in the region of interest based on the model. With the above solution, it is possible to inspect goods in a container efficiently, so as to find out whether there are goods not indicated in the customs declaration that are concealed in the container.

公开(公告)号：US10217204B2

公开(公告)日：2019-02-26

申请号：US15409738

申请日：2017-01-19

Applicant: Nuctech Company Limited

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

IPC: G06K9/62 ,  G06T5/00 ,  G06T7/00 ,  G06T3/00 ,  G06K9/46

Abstract: A method of evaluating an image quality for an imaging system and the imaging system are provided. The method in some examples includes: acquiring an image to be evaluated which is generated by the imaging system; extracting a number of sub-images from the image; obtaining a coefficient vector indicating a degree of sparsity by applying a sparse decomposition on the sub-images based on a pre-set redundant sparse representation dictionary; and performing a linear transformation on the coefficient vector so as to obtain an evaluation value for the image quality. The sparse dictionary is learned by only using a few high quality perspective images, and then the image quality is evaluated based on the sparse degree of the image obtained by using the sparse dictionary. A convenient and rapid no-reference image quality evaluation is achieved.

公开(公告)号：US10156528B2

公开(公告)日：2018-12-18

申请号：US15691748

申请日：2017-08-31

Applicant: NUCTECH COMPANY LIMITED

Inventor： Zhiqiang Chen ,  Yuanjing Li ,  Shangmin Sun ,  Yu Hu ,  Yuan Ma ,  Qiangqiang Wang ,  Long Du ,  Wei Li

IPC: G01F23/00 ,  G01N23/04 ,  G05D1/00 ,  G01V5/00

Abstract: This invention relates to a movable divided inspection system and method, wherein the scanning inspection system comprises a first radiation source, a first detection means, a first automated guided vehicle and a second automated guided vehicle. The first radiation source is mounted on the first automated guided vehicle. The first detection means is mounted on the second automated guided vehicle. The first automated guided vehicle and the second automated guided vehicle are able to drive the first radiation source and the first detection means to a preset scan inspection position, so as to form a scanning passage for passage of an article to be scanned between the first and second automated guided vehicle, such that scanning inspection of said article to be scanned is realized by relative movement of said article to be scanned with reference to said first automated guided vehicle and said second automated guided vehicle.

公开(公告)号：US10145977B2

公开(公告)日：2018-12-04

申请号：US15300668

申请日：2015-12-15

Applicant: NUCTECH COMPANY LIMITED

Inventor： Zhiqiang Chen ,  Li Zhang ,  Shuo Wang ,  Yunda Sun ,  Qingping Huang ,  Zhi Tang

IPC: G01V5/00 ,  G01N23/046 ,  G06T11/00

Abstract: A method for positioning a target in a three-dimensional CT image and a security check system. The method includes: displaying a three-dimensional CT image; receiving a selection by a user of at least one area of the three-dimensional CT image at a first viewing angle to generate a first three-dimensional description; receiving a selection by the user of at least one area of the three-dimensional CT image at a second viewing angle to generate a second three-dimensional description, wherein an angle between the first viewing angle and the second viewing angle is within a predetermined range and the first three-dimensional description and the second three-dimensional description are related to a size, a location, and/or a physical property of a target at corresponding viewing angles; and determining the target in the three-dimensional CT image based on the first three-dimensional description and the second three-dimensional description.

公开(公告)号：US10078056B2

公开(公告)日：2018-09-18

申请号：US14901970

申请日：2015-08-27

Applicant: Nuctech Company Limited

Inventor： Huaping Tang ,  Zhiqiang Chen ,  Yuanjing Li ,  Zhuoyan Liu ,  Yonggang Wang ,  Zhanfeng Qin

IPC: A61B6/03 ,  G01N23/04 ,  B07C5/34

CPC classification number: G01N23/04 ,  B07C5/3416 ,  B07C2501/0009

Abstract: An X-ray product quality online inspection device of the present invention comprises: a distributed X-ray source having a plurality of targets and being able to generate X-rays for irradiating an inspected product from the plurality of targets in a predetermined sequence; a detector for receiving the X-rays generated by the distributed X-ray source and outputting a signal representing characteristics of the received X-rays; a transport device which is located between the distributed X-ray source and the detector for carrying the inspected product to pass through an X-ray radiation region, wherein the transport device is arranged as a continuous transport mechanism which matches a production line of the inspected product; and a power supply and control device, which is used to supply power to and control the X-ray product quality online inspection device.

公开(公告)号：US20180217071A1

公开(公告)日：2018-08-02

申请号：US15505199

申请日：2015-12-23

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Zhiqiang Chen ,  Li Zhang ,  Le Shen ,  Qingping Huang ,  Xin Jin

IPC: G01N23/046

CPC classification number: G01N23/046 ,  G01N23/041 ,  G01N2223/1016 ,  G01N2223/419

Abstract: An X-ray imaging system and method are provided. The system may include: an X-ray source configured to irradiate X-ray beams; a first grating and a second grating arranged sequentially in an irradiation direction of the X-ray beams; a detector arranged at downstream of the second grating in the irradiation direction; and a controller and data processing device configured to control the X-ray source to irradiate the X-ray beams, to control the detector to receive X-ray beams passing through the first grating and the second grating to generate phase contrast information and/or dark field information, and to perform CT check on an object under check based on the phase contrast information and/or the dark field information to obtain a CT image. In this way, it is possible to obtain more characteristic information about the object under check, so as to achieve more precise material recognition and security check.

公开(公告)号：US10013615B2

公开(公告)日：2018-07-03

申请号：US15034021

申请日：2014-11-07

Applicant: Nuctech Company Limited

Inventor： Li Zhang ,  Zhiqiang Chen ,  Qiang Li ,  Jian Zhang ,  Jianping Gu ,  Jin Cui

IPC: G06K9/00 ,  G06K9/32 ,  G06K9/38 ,  G06K9/40 ,  G06K9/42 ,  G06K9/46 ,  G06K9/62

CPC classification number: G06K9/00771 ,  G06K9/00 ,  G06K9/3241 ,  G06K9/38 ,  G06K9/40 ,  G06K9/42 ,  G06K9/4642 ,  G06K9/627 ,  G06K2209/09

Abstract: The present disclosure discloses an inspection method and device. The method comprises steps of acquiring a perspective image of an inspected object; processing the perspective image to obtain a region of interest; and automatically detecting the region of interest using a cigarette model, to determine whether the region of interest of the perspective image belongs to a cigarette. In the present disclosure, cigarette detection is implemented on a scanned image of goods, particularly a container, which can avoid the problem of detection vulnerability and poor effect of manual image judgment for the conventional manner, and is of significance in fighting against cigarette smuggling.

公开(公告)号：US20180038970A1

公开(公告)日：2018-02-08

申请号：US15597003

申请日：2017-05-16

Applicant: Tsinghua University ,  NUCTECH COMPANY LIMITED

Inventor： Liang Li ,  Zhiqiang Chen ,  Li Zhang ,  Ziran Zhao ,  Yuxiang Xing ,  Kejun Kang ,  Lan Zhang ,  Ruizhe Li

IPC: G01T7/00 ,  G01N23/223

CPC classification number: G01T7/005 ,  G01N23/223 ,  G01N2223/076 ,  G01N2223/303

Abstract: A method and apparatus for reconstructing an incident energy spectrum for a detector are disclosed. In this method, an object to be inspected is illuminated with rays, and then rays transmitted through the object to be inspected are received by the detector to convert the received rays into data of a detected energy spectrum. The incident energy spectrum for the detector is reconstructed based on the data of the energy spectrum using a statistical iterative algorithm with a pre-established detector response function. With the above solution of the embodiments, the incident energy spectrum for the detector can be more accurately acquired, thereby reducing a distortion of the incident energy spectrum caused by the detector.

公开(公告)号：US20180038808A1

公开(公告)日：2018-02-08

申请号：US15609012

申请日：2017-05-31

Applicant: NUCTECH COMPANY LIMITED

Inventor： Zhiqiang Chen ,  Ziran Zhao ,  Jin Cui ,  Dong Lin ,  Bin Hu ,  Xianshun Tan ,  Hong Wang

IPC: G01N23/203

CPC classification number: G01N23/203 ,  G01V5/0025

Abstract: The present disclosure proposes a security inspection apparatus and method, relates to the technical field of radiation, wherein the security inspection apparatus of the disclosure comprises: radiation emitting device, back-scatter detector, size-distance detecting device, orientation adjusting device; the back-scatter detector located between the radiation emitting device and an inspected object; the size-distance detecting device located between the radiation emitting device and the inspected object, for detecting a size of the inspected object and/or a distance between the inspected object and the size-distance detecting device; and the orientation adjusting device adjusts orientation of the radiation emitting device according to the size of the inspected object and/or the distance from the inspected object. Such a security inspection apparatus can detect size and position information of the inspected object, and automatically adjust the position of the radiation emitting device according to the size and position of the inspected object, thereby reducing or avoiding detection dead angles, and improving accuracy of the detection.