公开(公告)号：US20190204240A1

公开(公告)日：2019-07-04

申请号：US16231373

申请日：2018-12-21

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Ke LI ,  Jianmin LI ,  Weifeng YU ,  Yulan LI ,  Xuejing YANG ,  Yuanjing LI ,  Chunguang ZONG ,  Zhiqiang CHEN ,  Li ZHANG

IPC: G01N23/04

CPC classification number: G01N23/04 ,  G01N2223/04 ,  G01N2223/303 ,  G01N2223/33 ,  G01N2223/401

Abstract: The present disclosure provides a scanned image correction apparatus, method and a mobile scanning device. The apparatus includes an image collector, an arm swing detector, and an image processor. The image collector is configured to collect a scanned image of an object under inspection during a scanning process of scanning the object under inspection by the mobile scanning device, and determine an image parameter of the scanned image. The arm swing detector is disposed at a monitor point on a detector arm of the mobile scanning device, and configured to detect a displacement offset of the detector arm in a specified direction and build an arm swing model of the detector arm. The image processor is configured to determine a change relationship between the image parameter of the scanned image and the displacement offset of the detector arm, and correct the scanned image based on the change relationship.

公开(公告)号：US20190094407A1

公开(公告)日：2019-03-28

申请号：US16037810

申请日：2018-07-17

Applicant: Nuctech Company Limited ,  Tsinghua University

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

IPC: G01V5/00 ,  G01N23/046

Abstract: The disclosure provides a scanning imaging system for security inspection of an object and an imaging method thereof, the system comprising: a conveying unit configured for bringing the object to move along a conveying direction; a plurality of radiographic sources at one side of the conveying unit, being arranged successively in a direction vertical to a plane, in which the conveying unit is located, and configured for alternately emitting ray beams to form a scanning area; a linear detector array 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.

公开(公告)号：US20180182129A1

公开(公告)日：2018-06-28

申请号：US15580005

申请日：2016-08-22

Applicant: TSINGHUA UNIVERSITY ,  Nuctech Company Limited

Inventor： Yuxiang XING ,  Li ZHANG ,  Huayu ZHANG ,  Le SHEN

IPC: G06T11/00 ,  G06T7/00

CPC classification number: G06T11/005 ,  G06T7/0012 ,  G06T2207/10081 ,  G06T2207/20081 ,  G06T2211/408

Abstract: A spectral CT image reconstructing method includes: collecting incomplete original projection data in each of a plurality of energy windows; performing a projection data cross estimation using corresponding original projection data in at least one pair of energy windows constituted by different energy windows of the plurality of energy windows to obtain estimated projection data, wherein each pair of energy windows comprises a first energy window and a second energy window; combining the original projection data and the corresponding estimated projection data to obtain complete projection data; and reconstructing a spectral CT image using the complete projection data.

公开(公告)号：US20170213331A1

公开(公告)日：2017-07-27

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: G06T7/00 ,  G06K9/62 ,  G06T11/00 ,  G06K9/66 ,  G06T7/11 ,  G06T3/00

CPC classification number: G06T7/0002 ,  G06K9/6245 ,  G06K9/6298 ,  G06K2009/4695 ,  G06T3/0056 ,  G06T5/002 ,  G06T2207/10116 ,  G06T2207/20021 ,  G06T2207/20052 ,  G06T2207/20076 ,  G06T2207/20081

Abstract: A method of evaluating an image quality for an imaging system and the imaging system are provided. The method may comprise: acquiring an image to be evaluated which is generated by the imaging system; extracting a plurality of sub-images from the image; obtaining a coefficient vector indicating a degree of sparsity by applying a sparse decomposition on the plurality of 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 which is obtained by using the sparse dictionary, thereby achieving a convenient and rapid no-reference image quality evaluation.

公开(公告)号：US20170184757A1

公开(公告)日：2017-06-29

申请号：US15279239

申请日：2016-09-28

Applicant: CINTS CO. LTD. ,  NUCTECH COMPANY LIMITED

Inventor： Qitian MIAO ,  Zhiqiang CHEN ,  Li ZHANG ,  Ming HUANG ,  Yunda SUN ,  Ming HU ,  Qingping HUANG ,  Jie XIA ,  Lei LEI

IPC: G01V5/00

CPC classification number: G01V5/005 ,  G01V5/0041

Abstract: An inspection device for quarantine that includes a dual-energy CT apparatus capable of distinguishing substances, a DR apparatus, a substance identification system capable of enhancing display of an object (plant, animal, meat, etc.) focused for quarantine and automatically so labeling, and an image processing system capable of highlighting a suspect of quarantine and providing a corresponding automatic alarm. Compared to the prior art, the present disclosure can highlight a focused object for quarantine, which may improve accuracy and efficiency of inspection for quarantine at a port.

公开(公告)号：US20170176631A1

公开(公告)日：2017-06-22

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 ,  G01N23/04

CPC classification number: G01V5/005 ,  G01N23/046 ,  G01N2223/401 ,  G01N2223/419 ,  G01N2223/643 ,  G01V5/0041 ,  G01V5/0058 ,  G06T11/008

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：US20150339521A1

公开(公告)日：2015-11-26

申请号：US14414515

申请日：2014-07-23

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Zhiqiang CHEN ,  Ziran ZHAO ,  Yuanjing LI ,  Wanlong WU ,  Xianli DING ,  Li ZHANG ,  Yingkang JIN ,  Zongjun SHEN ,  Le TANG

IPC: G06K9/00 ,  G07C9/00 ,  G06T7/00

CPC classification number: G06K9/00362 ,  A61B5/0064 ,  A61B5/1077 ,  A61B6/12 ,  A61B6/463 ,  A61B6/563 ,  G01V5/0008 ,  G06K9/00771 ,  G06K2209/09 ,  G06T7/0002 ,  G06T2207/30196 ,  G06T2207/30232 ,  G07C9/00158

Abstract: The present invention provides a privacy protection method and a human body security inspection system having the same function. The privacy protection method comprises the steps of: acquiring in real-time scanning row or column image data of a personal to be inspected; displaying a physical profile image and an outline image of the personal to be inspected, on basis of the processed image of the scanning row or column image data; transmitting the physical profile image to an equipment end display in a human body security inspection system and displaying it thereon, and displaying the outline image of the personal to be inspected on a remote operation end display of the human body security inspection system; performing the suspicious matter recognition based on the outline image; and correspondingly displaying a suspected frame on the physical profile image, based on the suspicious matter recognized in the outline image.

Abstract translation: 本发明提供了具有相同功能的隐私保护方法和人体安全检查系统。 隐私保护方法包括以下步骤：实时扫描待检查的个人的行或列图像数据; 基于扫描行或列图像数据的处理图像，显示待检查的个人的物理轮廓图像和轮廓图像; 将物理轮廓图像发送到人体安全检查系统中的设备端显示器并在其上显示，并且在人体安全检查系统的远程操作终端显示器上显示被检查人员的轮廓图像; 基于轮廓图像执行可疑物识别; 并且基于在轮廓图像中识别的可疑物，相应地在物理轮廓图像上显示可疑帧。

公开(公告)号：US20150241368A1

公开(公告)日：2015-08-27

申请号：US14572528

申请日：2014-12-16

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Zhiqiang CHEN ,  Ziran ZHAO ,  Yuanjing LI ,  Wanlong WU ,  Ming RUAN ,  Li ZHANG ,  Yingkang JIN ,  Le TANG ,  Xianli DING ,  Chenguang ZHU

IPC: G01N23/203

CPC classification number: G01N23/203 ,  G01T1/167 ,  G01V5/0025 ,  G01V5/0091

Abstract: A human body back-scattering inspection method and system are discloses. The method includes: obtaining a back-scattering scan image of a human body under inspection; distinguishing a body image from a background image in the back-scattering scan image; and calculating a feature parameter of the background image to determine whether radioactive substance is carried with the human body. With some embodiments of the present disclosure, it is possible to determine whether any radioactive substance is carried with a human body during back-scattering inspection of the human body. In further embodiments of the present disclosure, it is possible to approximately determine which part(s) of the human body carries the radioactive substance. This improves efficiency of inspection.

Abstract translation: 公开了人体背散射检查方法和系统。 该方法包括：获得检查中的人体的背散射​​扫描图像; 在背散射扫描图像中区分身体图像与背景图像; 并计算背景图像的特征参数，以确定放射性物质是否与人体携带。 利用本公开的一些实施例，可以在人体的后散射检查期间确定任何放射性物质是否携带人体。 在本公开的另外的实施例中，可以大致确定人体的哪一部分携带放射性物质。 这提高了检查的效率。

公开(公告)号：US20150220683A1

公开(公告)日：2015-08-06

申请号：US14540457

申请日：2014-11-13

Applicant: Nuctech Company Limited

Inventor： Zhiqiang CHEN ,  Yuanjing LI ,  Li ZHANG ,  Ziran ZHAO ,  Jianping GU ,  Shuo WANG

IPC: G06F19/12 ,  G06F17/18

CPC classification number: G16B5/00 ,  G06F17/18 ,  G06K9/6209 ,  G06K2209/055 ,  G06T17/20 ,  G06T2210/41

Abstract: Disclosed is method and apparatus for creating a statistical average model of an enamel-dentine junction. The method includes steps of: acquiring CT image data of a tooth; segmenting the CT image data to obtain a surface of an enamel-dentine junction; segmenting the obtained surface using a curvature-based clustering algorithm to remove a bottom of the enamel-dentine junction; spherical-parameterizing, by means of spherical harmonic analysis, the surface of the enamel-dentine junction after removal of the bottom; and aligning different samples of the tooth to obtain a statistical average model.

Abstract translation: 公开了用于创建釉质 - 牙质结的统计平均模型的方法和装置。 该方法包括以下步骤：获取牙齿的CT图像数据; 分割CT图像数据以获得釉 - 牙质结的表面; 使用基于曲率的聚类算法分割所获得的表面以去除釉质 - 牙质结的底部; 球形参数化，通过球面谐波分析，去除底部后的釉质 - 牙质结的表面; 并对齐不同牙齿样本以获得统计学平均模型。

公开(公告)号：US20150199804A1

公开(公告)日：2015-07-16

申请号：US14576705

申请日：2014-12-19

Applicant: Tsinghua University ,  Nuctech Company Limited

Inventor： Zhiqiang CHEN ,  Li ZHANG ,  Ji ZHAO ,  Qingping HUANG ,  Xin JIN

IPC: G06T7/00

CPC classification number: G06T7/0002 ,  G01V5/005 ,  G06T2207/30112

Abstract: A CT system and method thereof are discloses. The system includes: a fixed multi-plane multi-source X-ray generation device and a control system thereof that provide X-ray source used in luggage inspection; a single-energy, pseudo-dual-energy or spectral detector system and data transfer system that receive perspective data of X ray penetrating the luggage, and transfer the data to a computer for processing; a conveyor and a control system thereof that control a speed for moving the luggage forth and back, and perform tomogram scanning; and a host computer system that performs tomogram reconstruction and provides man-machine interaction. The system takes full advantage of characteristics, such as high speed and stability, brought by the distributed ray sources which replace the normal slip ring technology. The system also adopts the idea of inverse-geometry CT, and reduces detector area and cost by increasing the number of ray sources. With the reduction of detector area, cone-beam artifacts and cup-shape artifacts caused by scattering are also reduced, and influence of the oblique effect on registration of dual-energy data is suppressed.

Abstract translation: 公开了一种CT系统及其方法。 该系统包括：提供行李检查中使用的X射线源的固定多平面多源X射线产生装置及其控制系统; 单能量，伪双能量或光谱检测器系统和数据传输系统，其接收穿透行李的X射线的透视数据，并将数据传送到计算机进行处理; 输送机及其控制系统，其控制行李前后移动的速度，并执行断层图像扫描; 以及执行断层图像重建并提供人机交互的主计算机系统。 系统充分利用了代替普通滑环技术的分布式射线源带来的高速度，稳定性等特点。 该系统还采用反几何CT的思想，通过增加射线源数量，减少探测器面积和成本。 随着检测器面积的减小，散射引起的锥束伪影和杯形伪影也减少，并且斜率对双能数据配准的影响受到抑制。