Patents by Inventor Le SHEN
Le SHEN has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11917523Abstract: A polymorphic network control system and a polymorphic network control system method supporting terminal mobile access. A network architecture is redesigned based on the idea of separation of an identifier from a locator. In this network mode, the three-layer protocol is no longer a traditional IP message, but a message carrying a locator and an identifier. The polymorphic SDN network controller is responsible for forwarding the data packet to a destination corresponding to a destination locator. When the network location of a mobile device is changed, the transmission connection established based on the identifier will suspend communication due to the disconnection of the physical link. When the mobile device is re-accessed and a new forwarding path is established, the transmission connection can recover communication.Type: GrantFiled: May 30, 2023Date of Patent: February 27, 2024Assignees: ZHEJIANG LAB, INFORMATION ENGINEERING UNIVERSITYInventors: Zhongxia Pan, Peng Yi, Le Tian, Tao Zou, Juan Shen
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Patent number: 11906447Abstract: A multi-channel static CT device is provided, and the multi-channel static CT device includes: a scanning channel including a plurality of scanning sub-channels; a distributed X-ray source including a plurality of ray emission points arranged around the scanning channel; and a detector module including a plurality of detectors arranged around the scanning channel, wherein the plurality of detectors are arranged corresponding to the plurality of ray emission points.Type: GrantFiled: September 10, 2021Date of Patent: February 20, 2024Assignees: NUCTECH COMPANY LIMITED, Tsinghua UniversityInventors: Zhiqiang Chen, Li Zhang, Xiaofei Xu, Le Shen, Ming Chang, Hu Tang, Xin Jin, Yunda Sun
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Patent number: 11768163Abstract: The present application discloses a CT system and a detection apparatus for the CT system. The detection apparatus includes: a high-energy detector assembly including a plurality of rows of high-energy detectors arranged along a predetermined trajectory; a low-energy detector assembly including a plurality of rows of low-energy detectors arranged at intervals along the predetermined trajectory, the low-energy detector assembly and the high-energy detector assembly being disposed in a stack; a number of rows of the low-energy detectors is smaller than a number or rows of the high-energy detectors; and each row of the low-energy detectors covers a row of high-energy detectors.Type: GrantFiled: September 10, 2019Date of Patent: September 26, 2023Assignees: Nuctech Company Limited, Tsinghua UniversityInventors: Li Zhang, Zhiqiang Chen, Qingping Huang, Yunda Sun, Xin Jin, Le Shen, Liang Li, Tiao Zhao
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Publication number: 20230144259Abstract: The method includes: receiving an encoder signal and a ray machine output beam signal, and initially synchronizing the encoder signal and the ray machine output beam signal; recording coded value M of the encoder at moment tm, and coded value N of the encoder at moment tm+1, where M, N, and m are integers; determining that duration from the moment tm to the moment tm+1 is an actual output beam time interval T of the ray machine, when it is determined that a difference value between the coded value M and the coded value N satisfies preset value a, a being an integer; determining gap time TG in the actual output beam time interval T based on a preset output beam time interval TJ of the imaging system and the actual output beam time interval T; and controlling the ray machine not to emit beam within the gap time TG.Type: ApplicationFiled: November 4, 2022Publication date: May 11, 2023Inventors: Zhiqiang CHEN, Li ZHANG, Yunda SUN, Zhenhua ZHAO, Xin JIN, Le SHEN, Wuyang LIANG
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Patent number: 11516430Abstract: A video processing method and a video processor are provided. The video processing method can be utilized in a video processing system that includes a transmission terminal for generating an input video, the video processor, and a receiving terminal for receiving an output video. The method includes determining whether or not the input video is in at least one of an idle status, an unstable status and a terminated status; switching from outputting the output video to outputting a mute video when the input video is determined to be in at least one of the idle status, the unstable status and the terminated status; inserting a first general control packet for setting mute into one of a plurality of output frames of the mute video; and stopping outputting the mute video after the plurality of output frames of the mute video are outputted.Type: GrantFiled: September 14, 2021Date of Patent: November 29, 2022Assignee: REALTEK SEMICONDUCTOR CORP.Inventors: Chun-Chieh Chan, Yu-Le Shen, Tai-Jung Wu, Chia-Hao Chang
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Publication number: 20220166952Abstract: A video processing method and a video processor are provided. The video processing method can be utilized in a video processing system that includes a transmission terminal for generating an input video, the video processor, and a receiving terminal for receiving an output video. The method includes determining whether or not the input video is in at least one of an idle status, an unstable status and a terminated status; switching from outputting the output video to outputting a mute video when the input video is determined to be in at least one of the idle status, the unstable status and the terminated status; inserting a first general control packet for setting mute into one of a plurality of output frames of the mute video; and stopping outputting the mute video after the plurality of output frames of the mute video are outputted.Type: ApplicationFiled: September 14, 2021Publication date: May 26, 2022Inventors: CHUN-CHIEH CHAN, YU-LE SHEN, TAI-JUNG WU, CHIA-HAO CHANG
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Publication number: 20220091051Abstract: A multi-channel static CT device is provided, and the multi-channel static CT device includes: a scanning channel including a plurality of scanning sub-channels; a distributed X-ray source including a plurality of ray emission points arranged around the scanning channel; and a detector module including a plurality of detectors arranged around the scanning channel, wherein the plurality of detectors are arranged corresponding to the plurality of ray emission points.Type: ApplicationFiled: September 10, 2021Publication date: March 24, 2022Inventors: Zhiqiang CHEN, Li ZHANG, Xiaofei XU, Le SHEN, Ming CHANG, Hu TANG, Xin JIN, Yunda SUN
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Publication number: 20220042929Abstract: The present application discloses a CT system and a detection apparatus for the CT system. The detection apparatus includes: a high-energy detector assembly including a plurality of rows of high-energy detectors arranged along a predetermined trajectory; a low-energy detector assembly including a plurality of rows of low-energy detectors arranged at intervals along the predetermined trajectory, the low-energy detector assembly and the high-energy detector assembly being disposed in a stack; a number of rows of the low-energy detectors is smaller than a number or rows of the high-energy detectors; and each row of the low-energy detectors covers a row of high-energy detectors.Type: ApplicationFiled: September 10, 2019Publication date: February 10, 2022Applicants: Nuctech Company Limited, Tsinghua UniversityInventors: Li ZHANG, Zhiqiang CHEN, Qingping HUANG, Yunda SUN, Xin JIN, Le SHEN, Liang Ll, Tiao ZHAO
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Patent number: 10984565Abstract: An image processing method, comprising: acquiring, by a CT scanning system, projection data of an object; and processing, by using a convolutional neural network, the projection data, to acquire an estimated image of the object. The convolutional neural network comprises: a projection domain network for processing input projection data to obtain estimated projection data; an analytical reconstruction network layer for performing analytical reconstruction to obtain a reconstructed image; an image domain network for processing the reconstructed image to obtain an estimated image, a projection layer for performing a projection operation by using a system projection matrix of the CT scanning system, to obtain a projection result of the estimated image; and a statistical model layer for determining consistency among the input projection data, the estimated projection data, and the projection result of the estimated image based on a statistical model.Type: GrantFiled: December 28, 2018Date of Patent: April 20, 2021Assignees: Tsinghua University, NUCTECH COMPANY LIMITEDInventors: Yuxiang Xing, Kaichao Liang, Le Shen, Li Zhang, Hongkai Yang, Kejun Kang, Zhiqiang Chen, Jianmin Li, Yinong Liu
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Patent number: 10724969Abstract: 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.Type: GrantFiled: October 30, 2018Date of Patent: July 28, 2020Assignees: NUCTECH COMPANY LIMITED, TSINGHUA UNIVERSITYInventors: Yuxiang Xing, Xiaoyue Guo, Zhi Deng, Le Shen, Li Zhang, Zhiqiang Chen, Liang Li
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Patent number: 10641715Abstract: 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.Type: GrantFiled: December 23, 2015Date of Patent: May 5, 2020Assignees: Nuctech Company Limited, Tsinghua UniversityInventors: Zhiqiang Chen, Li Zhang, Le Shen, Qingping Huang, Xin Jin
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Patent number: 10643759Abstract: The disclosure relates to a grating and a radiation imaging device. The grating comprises a plurality of stacked grating elements. The grating elements are stacked to form a grid. The grating element comprises a first sheet and a second sheet having two parallel planes. The second sheet is stacked at the first sheet in a length direction of the first sheet. The first sheet is almost impervious to radiation. The present disclosure stacks the sheets having different specifications together to form the grating with uniform grating slits, such that there is no limitation on the thickness of the grating and the grating can be used along with high-energy radiations.Type: GrantFiled: November 3, 2017Date of Patent: May 5, 2020Assignees: Nuctech Company Limited, Tsinghua UniversityInventors: Li Zhang, Mingzhi Hong, Qingping Huang, Le Shen
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Patent number: 10634810Abstract: 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.Type: GrantFiled: July 17, 2018Date of Patent: April 28, 2020Assignees: Nuctech Company Limited, Tsinghua UniversityInventors: Li Zhang, Zhiqiang Chen, Le Shen, Qingping Huang, Yunda Sun, Xin Jin, Hui Ding, Yuxiang Xing
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Patent number: 10489939Abstract: 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.Type: GrantFiled: August 22, 2016Date of Patent: November 26, 2019Assignees: TSINGHUA UNIVERSITY, NUCTECH COMPANY LIMITEDInventors: Yuxiang Xing, Li Zhang, Huayu Zhang, Le Shen
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Publication number: 20190206095Abstract: An image processing method, comprising: acquiring, by a CT scanning system, projection data of an object; and processing, by using a convolutional neural network, the projection data, to acquire an estimated image of the object. The convolutional neural network comprises: a projection domain network for processing input projection data to obtain estimated projection data; an analytical reconstruction network layer for performing analytical reconstruction to obtain a reconstructed image; an image domain network for processing the reconstructed image to obtain an estimated image, a projection layer for performing a projection operation by using a system projection matrix of the CT scanning system, to obtain a projection result of the estimated image; and a statistical model layer for determining consistency among the input projection data, the estimated projection data, and the projection result of the estimated image based on a statistical model.Type: ApplicationFiled: December 28, 2018Publication date: July 4, 2019Inventors: Yuxiang XING, Kaichao LIANG, Le SHEN, Li ZHANG, Hongkai YANG, Kejun KANG, Zhiqiang CHEN, Jianmin LI, Yinong LIU
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Publication number: 20190094407Abstract: 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.Type: ApplicationFiled: July 17, 2018Publication date: March 28, 2019Applicants: Nuctech Company Limited, Tsinghua UniversityInventors: Li ZHANG, Zhiqiang CHEN, Le SHEN, Qingping HUANG, Yunda SUN, Xin JIN, Hui DING, Yuxiang XING
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Publication number: 20190086562Abstract: 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.Type: ApplicationFiled: October 30, 2018Publication date: March 21, 2019Applicants: Tsinghua University, Nuctech Company LimitedInventors: Yuxiang XING, Xiaoyue GUO, Zhi DENG, Le SHEN, Li ZHANG, Zhiqiang CHEN, Liang LI
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Publication number: 20180217071Abstract: 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.Type: ApplicationFiled: December 23, 2015Publication date: August 2, 2018Inventors: Zhiqiang Chen, Li Zhang, Le Shen, Qingping Huang, Xin Jin
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Publication number: 20180182129Abstract: 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.Type: ApplicationFiled: August 22, 2016Publication date: June 28, 2018Inventors: Yuxiang XING, Li ZHANG, Huayu ZHANG, Le SHEN
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Publication number: 20180075938Abstract: The disclosure relates to a grating and a radiation imaging device. The grating comprises a plurality of stacked grating elements. The grating elements are stacked to form a grid. The grating element comprises a first sheet and a second sheet having two parallel planes. The second sheet is stacked at the first sheet in a length direction of the first sheet. The first sheet is almost impervious to radiation. The present disclosure stacks the sheets having different specifications together to form the grating with uniform grating slits, such that there is no limitation on the thickness of the grating and the grating can be used along with high-energy radiations.Type: ApplicationFiled: November 3, 2017Publication date: March 15, 2018Applicants: Tsinghua University, Nuctech Company LimitedInventors: Li ZHANG, Mingzhi HONG, Qingping HUANG, Le SHEN