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公开(公告)号：US20150356755A1
公开(公告)日：2015-12-10
申请号：US14758795
申请日：2013-10-31
Applicant: NUCTECH COMPANY LIMITED , TSINGHUA UNIVERSITY
Inventor： Le Shen , Yuxiang Xing , Yuanji Li , Chuqing Feng , Li Zhang , Zhiqiang Chen
CPC classification number: G06T11/005 , A61B6/032 , A61B6/4241 , A61B6/4266 , A61B6/482 , A61B6/5205 , G01N23/046 , G01N2223/419 , G01T1/2985 , G06T5/50 , G06T2207/10081 , G06T2207/20182
Abstract: CT imaging systems and methods thereof are disclosed. A common CT scanning is performed on an object to obtain a common CT imaging. An area of interest is determined from the image. A CT scanning is performed on the area of interest under a plurality of energy windows by a photon counter detector. A high resolution image of the area of interest is reconstructed. The discrimination of energy spectrum is higher and the result so obtained is more stable by using a photon counter detector to collect photon count projection data of a plurality of energy windows and thus it may be decomposed into a plurality of basis functions.
Abstract translation: 公开了CT成像系统及其方法。 对物体执行常见的CT扫描以获得常见的CT成像。 根据图像确定感兴趣的区域。 通过光子计数器检测器在多个能量窗口下对感兴趣的区域进行CT扫描。 重建感兴趣区域的高分辨率图像。 通过使用光子计数器检测器来收集多个能量窗口的光子计数投影数据，能量谱的辨别较高，得到的结果更加稳定，因此可将其分解为多个基本函数。
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公开(公告)号：US20150332486A1
公开(公告)日：2015-11-19
申请号：US14708866
申请日：2015-05-11
Applicant: Nuctech Company Limited , Tsinghua University
Inventor： Li Zhang , Zhiqiang Chen , Le Shen , Yuxiang Xing , Xin Jin , Qingping Huang
CPC classification number: G06T11/006 , A61B6/027 , A61B6/032 , A61B6/4085 , A61B6/4266 , A61B6/5205 , G06T7/0012 , G06T2207/10081 , G06T2207/30004 , G06T2211/421
Abstract: The present disclosure discloses a spiral CT system and a reconstruction method thereof. In some embodiments, it is proposed that data missing due to a large pitch is compensated by weighting the complementary projection data of the projection data obtained using the spiral CT system. After the data is complemented, the projection data is rebinned as cone parallel beam data, cone-angle cosine weighting and one-dimensional filtering are implemented on the rebinned data, and parallel beam back projection is finally implemented on the filtered data, to obtain the reconstructed images. In some embodiments, with the above method, the speed of the belt can be increased by more than one time in a case that the existing area of the detectors and the existing speed of the slip ring are unchanged, thereby improving the pass rate of the luggage and maintaining the quality of the reconstructed images unchanged.
Abstract translation: 本公开公开了一种螺旋CT系统及其重建方法。 在一些实施例中，提出通过对使用螺旋CT系统获得的投影数据的互补投影数据进行加权来补偿由于大音调而丢失的数据。 数据补充后，将投影数据重新设置为锥形平行光束数据，对重定位数据进行锥角余弦加权和一维滤波，最后在滤波数据上实现平行光束反投影，获得 重建图像。 在一些实施例中，利用上述方法，在检测器的现有区域和滑环的现有速度不变的情况下，带的速度可以增加多于一次，从而提高了传感器的通过率 行李保持重建图像的质量不变。
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公开(公告)号：US20150185153A1
公开(公告)日：2015-07-02
申请号：US14575381
申请日：2014-12-18
Applicant: Nuctech Company Limited , Tsinghua University
Inventor： Li Zhang , Li Jiang , Jianhong Zhang , Hongqiu Wang , Yumin Yi
IPC: G01N21/65
CPC classification number: G01N21/65 , G01N21/658
Abstract: Embodiments of the present invention disclose a pesticide residue detection method, comprising the steps: (a) irradiating a sample to be detected by an exciting light and collecting a Raman scattered light from the sample; (b) acquiring a Raman spectrum of the sample from the collected Raman scattered light; and (c) comparing the Raman spectrum with reference Raman spectra for known pesticides in a reference Raman library to determine composition and concentration of the pesticide residue in the sample. The method may achieve effective, convenient and accurate inspection of the pesticide residue in foods, in particular suitable for rapid detection.
Abstract translation: 本发明的实施方式公开了农药残留检测方法，其特征在于，包括以下步骤：（a）用激发光照射被检测体，从所述样品收集拉曼散射光; （b）从所收集的拉曼散射光中获取样品的拉曼光谱; 和（c）将参考拉曼文库中的已知农药的拉曼光谱与参考拉曼光谱进行比较，以确定样品中农药残留的组成和浓度。 该方法可以有效，方便，准确地检测食品中的农药残留，特别适合快速检测。
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公开(公告)号：US09020279B2
公开(公告)日：2015-04-28
申请号：US14146263
申请日：2014-01-02
Applicant: Tsinghua University , Nuctech Company Limited
Inventor： Li Zhang , Zhiqiang Chen , Jia Hao
CPC classification number: G06K9/6202 , G06T5/50 , G06T2211/408
Abstract: Provided are image processing method and apparatus. The method includes selecting one of a plurality of images matched in structure as reference image, and select another of the images as subject image; for a subject pixel in the subject image, determining a pixel corresponding to the subject pixel in the reference image; calculating similarity values of at least part of pixels in the reference image with respect to the pixel corresponding to the subject pixel; establishing weight coefficients based on the similarity values, and weighted averaging the subject pixel in the subject image to obtain a processed pixel value. With the above solutions, it is possible to use structure information of a higher-quality image in processing another image, and thus improve quality of the other image.
Abstract translation: 提供图像处理方法和装置。 该方法包括选择结构中匹配的多个图像中的一个作为参考图像，并且选择另一个图像作为被摄体图像; 对于所述被摄体图像中的被摄体像素，确定与所述参考图像中的所述被摄体像素相对应的像素; 计算参考图像中与像素对应的像素的至少部分像素的相似度值; 基于相似度值建立权重系数，并对被摄体图像中的被摄体像素进行加权平均以获得经处理的像素值。 利用上述解决方案，可以在处理另一图像时使用较高质量图像的结构信息，从而提高其他图像的质量。
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公开(公告)号：US20140211917A1
公开(公告)日：2014-07-31
申请号：US14129655
申请日：2012-12-31
Applicant: Tsinghua University , Nuctech Company Limited
Inventor： Zhiqiang Chen , Li Zhang , Ziran Zhao , Yuxiang Xing , Jia Hao , Liang Li
IPC: G01V5/00
CPC classification number: G01V5/0016 , A61B6/032 , A61B6/4007 , A61B6/4014 , A61B6/4078 , A61B6/4233 , A61B6/4275 , G01N23/046 , G01T1/2985 , G01V5/005
Abstract: The present invention discloses apparatus and method for ray scanning imaging. The apparatus comprises a plurality of ray generators and a ray detection device. The plurality of ray generators are arranged uniformly along a circular arc and emit ray beams in sequence or simultaneously to an object to be inspected within a single scanning period. The ray detection device may be either in a multi-segmental semi-closed configuration composed of a plurality of linear arrays of ray detectors or in a circular arc configuration where a plurality of ray detection units arranged uniformly along a circular arc. During the inspection, the apparatus is advantageous in obtaining the complete ray projection values without rotation thereof, so as to effectively shorten the inspection time.
Abstract translation: 本发明公开了一种用于射线扫描成像的装置和方法。 该装置包括多个射线发生器和射线检测装置。 多个射线发生器沿着圆弧均匀地布置，并且在单个扫描周期内依次发射射线束或同时发射到被检查物体。 射线检测装置可以是由多个线状阵列的射线检测器组成的多段半封闭构造，也可以是多个沿着圆弧均匀排列的射线检测单元的圆弧结构。 在检查期间，该装置有利于获得完整的射线投影值而不旋转，以便有效地缩短检查时间。
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Patent Agency Ranking
公开(公告)号：US12131543B2
公开(公告)日：2024-10-29
申请号：US17202088
申请日：2021-03-15
Applicant: Tsinghua University , Nuctech Company Limited
Inventor： Li Zhang , Zhiqiang Chen , Yuanjing Li , Yuxiang Xing , Fanhua Meng , Qiang Li , Wei Li , Gang Fu
IPC: G06F16/583 , G06F16/55 , G06V10/20 , G06V10/75 , G06V10/764 , G06V10/82 , G06V20/20 , G06V20/52 , G06Q10/0832
CPC classification number: G06V20/52 , G06F16/55 , G06F16/583 , G06V10/255 , G06V10/75 , G06V10/764 , G06V10/82 , G06V20/20 , G06Q10/0832
Abstract: A semantic-based method and apparatus for retrieving a perspective image, an electronic device and a computer-readable storage medium are provided. An method includes obtaining a perspective image for a space containing an inspected object therein. A semantic division on the perspective image is performed using a first method, to obtain a plurality of semantic region units. A feature extraction network is constructed using a second method. Based on the perspective image and each of the plurality of semantic region units, a feature of each semantic region unit is extracted using the feature extraction network. Based on the feature of each semantic region unit, an image most similar to the semantic region unit is retrieved from an image feature database, to assist in determining an inspected object in the semantic region unit.
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公开(公告)号：US11340177B2
公开(公告)日：2022-05-24
申请号：US15733630
申请日：2020-01-20
Applicant: Nuctech Company Limited , Tsinghua University
Inventor： Zhiqiang Chen , Li Zhang , Zhenhua Zhao , Yunda Sun , Xin Jin , Wuyang Liang
Abstract: Disclosed are calibration assembly and calibration method of calibrating geometric parameters of a CT apparatus. The calibration assembly includes at least one calibration unit each including a plurality of calibration wires, and the plurality of calibration wires are arranged regularly in a same plane. The calibration assembly is easy to be processed and can be used to calibrate geometric parameters of a CT apparatus, and the calibration operations are simple and easy to be implemented.
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公开(公告)号：US20210323696A1
公开(公告)日：2021-10-21
申请号：US16336750
申请日：2019-01-04
Applicant: Nuctech Company Limited
Inventor： Li Zhang , Zhiqiang Chen , Qingping Huang , Wenyuan Bi , Xin Jin , Ming Chang , Mingzhi Hong , Yancai Wang
Abstract: A baggage cart is disclosed. The baggage cart is used for security inspection in an airport, comprising: a cart body, comprising at least one compartment having a door; and a locking device, coupled to the compartment and configured to lock the compartment in response to receiving an indication signal.
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公开(公告)号：US20210286842A1
公开(公告)日：2021-09-16
申请号：US17202088
申请日：2021-03-15
Applicant: Tsinghua University , Nuctech Company Limited
Inventor： Li Zhang , Zhiqiang Chen , Yuanjing Li , Yuxiang Xing , Fanhua Meng , Qiang Li , Wei Li , Gang Fu
IPC: G06F16/583 , G06K9/00 , G06F16/55
Abstract: A semantic-based method and apparatus for retrieving a perspective image, an electronic device and a computer-readable storage medium are provided. An method includes obtaining a perspective image for a space containing an inspected object therein. A semantic division on the perspective image is performed using a first method, to obtain a plurality of semantic region units. A feature extraction network is constructed using a second method. Based on the perspective image and each of the plurality of semantic region units, a feature of each semantic region unit is extracted using the feature extraction network. Based on the feature of each semantic region unit, an image most similar to the semantic region unit is retrieved from an image feature database, to assist in determining an inspected object in the semantic region unit.
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公开(公告)号：US11104309B2
公开(公告)日：2021-08-31
申请号：US16233398
申请日：2018-12-27
Applicant: TSINGHUA UNIVERSITY , Nuctech Company Limited
Inventor： Yuan He , Jianmin Li , Hongqi Li , Yulan Li , Qiangqiang Wang , Yuanjing Li , Zhiqiang Chen , Li Zhang
Abstract: A fork-arm lift tractor includes a vehicle body, a supporting plate disposed above the vehicle body, a lifting device for driving the supporting plate to be lifted, a front and rear fork-arm assemblies, a front and rear fork-arm drive assemblies. The front fork-arm assembly includes two front fork-arms rotatably disposed at the supporting plate. The rear fork-arm assembly includes two rear fork-arms rotatably disposed at the supporting plate, and the front and rear fork-arms may be deployed or retracted from both sides of the supporting plate. The front fork-arm driving assembly includes a front transmission part, and a front power device disposed at the supporting plate and may drive the front transmission part to move horizontally linearly so as to rotate the two front fork-arms. The rear fork-arm driving assembly has almost the same structure of the front fork-arm driving assembly and is used to rotate the two rear fork-arms.
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