Patents by Inventor Zhaohua Liu
Zhaohua Liu 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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Publication number: 20240178898Abstract: A method for transmitting a compressed codebook, and a method for obtaining a channel state information matrix are disclosed. The method may include acquiring a channel state information (CSI) matrix for subsequent feedback; inputting the CSI matrix into an encoder network structure to acquire a first compressed codebook corresponding to the CSI matrix, wherein a number of elements of the first compressed codebook is less than a number of elements of the CSI matrix; and transmitting the first compressed codebook to a base station.Type: ApplicationFiled: December 10, 2021Publication date: May 30, 2024Inventors: Lei LIU, Hao WU, Lun LI, Huahua XIAO, Zhaohua LU
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Publication number: 20240172022Abstract: A wireless communication method includes requesting, by a wireless communication entity, user equipment (UE) to provide location information; and providing, by the wireless communication entity, a measurement gap to a wireless communication node or the UE.Type: ApplicationFiled: July 6, 2023Publication date: May 23, 2024Applicant: ZTE CorporationInventors: Guozeng ZHENG, Chuangxin JIANG, Yansheng LIU, Yu PAN, Zhaohua LU, Hao WU
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Patent number: 11991570Abstract: Disclosed are a signal transmission method and device, and a computer storage, including that: a base station sends or receives a signal within a sweep time interval, an access signal time interval, which is comprised of sweep time blocks sweep time blocks. The access signal time interval includes a downlink access signal time interval and an uplink access signal time interval. The base station sends the signal over the downlink access signal time interval, and receives the signal over the uplink access signal time interval. A terminal sends or receives a signal within the access signal time interval which is comprised of the sweep time blocks. The terminal sends the signal over the uplink access signal time interval, or receives the signal over the downlink access signal time interval.Type: GrantFiled: May 22, 2023Date of Patent: May 21, 2024Assignee: ZTE CorporationInventors: Peng Hao, Junfeng Zhang, Xing Liu, Zhaohua Lu, Xinhui Wang, Liujun Hu, Gang Bai
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Publication number: 20230321072Abstract: A use of anisodamine or a pharmaceutically acceptable salt thereof in the preparation of a cellular glycocalyx protectant and a use of the anisodamine or the pharmaceutically acceptable salt thereof as a cellular glycocalyx protectant in the restoration and protection of cellular glycocalyx and a cell adhesion junction are provided. The use of the anisodamine or the pharmaceutically acceptable salt thereof in the preparation of cellular glycocalyx protectant also has an effect of protecting the structure and function of an endothelial cell.Type: ApplicationFiled: September 1, 2021Publication date: October 12, 2023Applicant: CHENGDU FIRST PHARMACEDTICAL CO., LTDInventors: Zhaohua LIU, Ye ZENG
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Patent number: 11382559Abstract: An intra-oral imaging apparatus for obtaining a contour image of a tooth has a fringe pattern generator energizable to emit a fringe pattern illumination. The fringe pattern generator has (i) at least one structured light source that is energizable to emit a patterned light beam; (ii) at least one reflective element in the path of the emitted patterned light beam and actuable to rotate about an axis to scan the emitted patterned light beam along a tooth surface as fringe pattern illumination. A detector is configured to acquire one or more images of the fringe pattern illumination from the tooth surface. A control logic processor is configured to control the fringe pattern generator for illuminating the tooth and to obtain and process the one or more images acquired by the detector.Type: GrantFiled: September 16, 2014Date of Patent: July 12, 2022Inventors: Zhaohua Liu, Tan Wang
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Publication number: 20210322138Abstract: A method for imaging a region of interest of patient dentition acquires an intraoral scan and forms a 3D digital model of a first surface contour of patient dentition that includes the region of interest and acquires a physical impression that includes at least the region of interest. The method scans the physical impression and generates a second surface contour of the identified region of interest. The digital model is modified by combining a portion of the second surface contour with the first surface contour over the region of interest. The modified digital model is displayed.Type: ApplicationFiled: February 23, 2018Publication date: October 21, 2021Inventors: Yu ZHOU, Qinran CHEN, Siqi ZHUANG, Zhaohua LIU
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Patent number: 10347031Abstract: A method for color texture imaging of teeth with a monochrome sensor array obtains a 3-D mesh representing a surface contour image according to image data from views of the teeth. For each view, recording image data generates sets of at least three monochromatic shading images. Each set of the monochromatic shading images is combined to generate 2-D color shading images, corresponding to one of the views. Each polygonal surface in the mesh is assigned to one of a subset of the views. Polygonal surfaces assigned to the same view are grouped into a texture fragment. Image coordinates for the 3-D mesh surfaces in each texture fragment are determined from projection of vertices onto the view associated with the texture fragment. The 3-D mesh is rendered with texture values in the 2-D color shading images corresponding to each texture fragment to generate a color texture surface contour image.Type: GrantFiled: September 11, 2015Date of Patent: July 9, 2019Assignee: Carestream Dental Technology Topco LimitedInventors: Yingqian Wu, Victor C. Wong, Qinran Chen, Zhaohua Liu
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Publication number: 20180025529Abstract: A method for color texture imaging of teeth with a monochrome sensor array obtains a 3-D mesh representing a surface contour image according to image data from views of the teeth. For each view, recording image data generates sets of at least three monochromatic shading images. Each set of the monochromatic shading images is combined to generate 2-D color shading images, corresponding to one of the views. Each polygonal surface in the mesh is assigned to one of a subset of the views. Polygonal surfaces assigned to the same view are grouped into a texture fragment. Image coordinates for the 3-D mesh surfaces in each texture fragment are determined from projection of vertices onto the view associated with the texture fragment. The 3-D mesh is rendered with texture values in the 2-D color shading images corresponding to each texture fragment to generate a color texture surface contour image.Type: ApplicationFiled: September 11, 2015Publication date: January 25, 2018Inventors: Yingqian Wu, Victor C. Wong, Qinran Chen, Zhaohua Liu
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Publication number: 20170224272Abstract: An intra-oral imaging apparatus for obtaining a contour image of a tooth has a fringe pattern generator energizable to emit a fringe pattern illumination. The fringe pattern generator has (i) at least one structured light source that is energizable to emit a patterned light beam; (ii) at least one reflective element in the path of the emitted patterned light beam and actuable to rotate about an axis to scan the emitted patterned light beam along a tooth surface as fringe pattern illumination. A detector is configured to acquire one or more images of the fringe pattern illumination from the tooth surface. A control logic processor is configured to control the fringe pattern generator for illuminating the tooth and to obtain and process the one or more images acquired by the detector.Type: ApplicationFiled: September 16, 2014Publication date: August 10, 2017Inventors: Zhaohua LIU, Tan WANG
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Publication number: 20170135655Abstract: A method for forming a 3-D facial model obtains a reconstructed radiographic image volume of a patient and extracts a soft tissue surface of the patient's face from the image volume and forms a dense point cloud of the extracted surface. Reflection images of the face are acquired using a camera, wherein each reflection image has a different corresponding camera angle with respect to the patient. Calibration data is calculated for one or more of the reflection images. A sparse point cloud corresponding to the reflection images is formed by processing the reflection images using multi-view geometry. The sparse point cloud is registered to the dense point cloud and a transformation calculated between reflection image texture data and the dense point cloud. The calculated transformation is applied for mapping texture data from the reflection images to the dense point cloud to form a texture-mapped volume image that is displayed.Type: ApplicationFiled: August 8, 2014Publication date: May 18, 2017Inventors: Wei Wang, Zhaohua Liu, Guijian Wang, Jean-Marc Inglese
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Patent number: 9204788Abstract: An autofocus method for an intra-oral camera modulates the focus of a liquid lens in a cycle that has at least first, second, and third focus positions and obtains an image at each focus position, measuring focus of the obtained image. The position of the liquid lens is adjusted according to the measured focus. Steps of modulating the focus of the liquid lens in the cycle with at least first, second, and third focus positions, and obtaining the image at each focus position and measuring focus of the obtained image are repeated.Type: GrantFiled: March 14, 2012Date of Patent: December 8, 2015Assignee: Carestream Health, Inc.Inventors: Zaiguang Yu, Guijian Wang, Zhaohua Liu
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Publication number: 20140017625Abstract: An intra-oral camera (10) includes an imaging system (12), an imaging sensor (16) and an image stabilization apparatus (14) comprising a liquid lens (36), lens driver elements (38), a microprocessor (34) and a motion sensor (32). The motion sensor (32) provides a motion signal indicating camera movement. The adjustable liquid lens (36) has an interface between first and second immiscible liquids and is actuable to change refraction with respect to a first axis in response to a first adjustment signal at a first pair of electrodes and with respect to a second axis in response to a second adjustment signal at a second pair of electrodes. The microprocessor (34) is responsive to stored instructions for obtaining the motion signal from the motion sensor (32) and in communication with lens driver elements (38) for providing the first and second adjustment signals to the adjustable liquid lens (36).Type: ApplicationFiled: April 8, 2011Publication date: January 16, 2014Inventors: Zhaohua Liu, Jean-Marc Inglese, Tan Wang, Xiaogin Yu, Jiwu Zhang
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Publication number: 20140002626Abstract: An autofocus method for an intra-oral camera modulates the focus of a liquid lens in a cycle that has at least first, second, and third focus positions and obtains an image at each focus position, measuring focus of the obtained image. The position of the liquid lens is adjusted according to the measured focus. Steps of modulating the focus of the liquid lens in the cycle with at least first, second, and third focus positions, and obtaining the image at each focus position and measuring focus of the obtained image are repeated.Type: ApplicationFiled: March 14, 2012Publication date: January 2, 2014Inventors: Zaiguang Yu, Guijian Wang, Zhaohua Liu
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Patent number: 8571397Abstract: The present invention related to an auto focus intraoral camera. The auto focus intraoral camera includes an illumination module for providing illuminating light, an imager, and a lens system for collecting light reflected from an object and focusing the light onto the imager, wherein said lens system further comprises at least one liquid lens including a vessel filled with a first liquid, and a second liquid being in contact with said first liquid, the first and second liquids being immiscible, of different optical indexes, and of substantially same density; wherein the lens system further includes a driver integrated circuit applying variable voltage to control the focal length of said lens. According to the present application, a compact auto focus intraoral camera with a small size and simple structure is provided, which decreases the camera complexity and improve the performance.Type: GrantFiled: November 21, 2008Date of Patent: October 29, 2013Assignee: Carestream Health, Inc.Inventors: Zhaohua Liu, Tan Wang, Jiwu Zhang
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Patent number: 8305486Abstract: An auto-focus camera has an optical system for forming an image of a target, a moveable sensor for recording a set of one or more images of the target, the set of one or more images corresponding to a set of one or more positions for the moveable sensor, and a linear piezoelectric actuator mechanically coupled to the moveable sensor for driving the moveable sensor to the set of one or more positions along a predetermined moving direction in response to a stimulus. A driving system is actuable to generate the stimulus to drive the piezoelectric actuator. An image processor, in response to stored instructions, obtains the set of one or more recorded images from the moveable sensor, processes the set of one or more obtained recoded images, and identifies the image that is in focus.Type: GrantFiled: April 20, 2010Date of Patent: November 6, 2012Assignee: Carestream Health, Inc.Inventors: Yufeng Mo, Tan Wang, Zhaohua Liu
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Publication number: 20120200686Abstract: An auto focus intraoral camera with liquid lens includes: a digital imaging sensor (304) for capturing a digital image of an object; a light source for illuminating the object; an imaging lens assembly (302) for directing the light from the object along an optical path toward the digital imaging sensor; a liquid lens (100) disposed in the optical path between the imaging lens assembly and the digital imaging sensor, where the liquid lens has an adjustable focal length; a driver (306) for applying a variable voltage to the liquid lens to control the focal length of the liquid lens; and a processor (308) for processing the digital image captured by the digital imaging sensor. Meanwhile, a continuously auto focusing method for an intraoral camera is disclosed.Type: ApplicationFiled: October 30, 2009Publication date: August 9, 2012Inventors: Zaiguang Yu, Zhaohua Liu, Tan Wang, Mantao Xu, jiwu Zhang
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Publication number: 20110222841Abstract: The present invention related to an auto focus intraoral camera. The auto focus intraoral camera includes an illumination module for providing illuminating light, an imager, and a lens system for collecting light reflected from an object and focusing the light onto the imager, wherein said lens system further comprises at least one liquid lens including a vessel filled with a first liquid, and a second liquid being in contact with said first liquid, the first and second liquids being immiscible, of different optical indexes, and of substantially same density; wherein the lens system further includes a driver integrated circuit applying variable voltage to control the focal length of said lens. According to the present application, a compact auto focus intraoral camera with a small size and simple structure is provided, which decreases the camera complexity and improve the performance.Type: ApplicationFiled: November 21, 2008Publication date: September 15, 2011Inventors: Zhaohua Liu, Tan Wang, Jiwu Zhang
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Publication number: 20110157457Abstract: An auto-focus camera has an optical system for forming an image of a target, a moveable sensor for recording a set of one or more images of the target, the set of one or more images corresponding to a set of one or more positions for the moveable sensor, and a linear piezoelectric actuator mechanically coupled to the moveable sensor for driving the moveable sensor to the set of one or more positions along a predetermined moving direction in response to a stimulus. A driving system is actuable to generate the stimulus to drive the piezoelectric actuator. An image processor, in response to stored instructions, obtains the set of one or more recorded images from the moveable sensor, processes the set of one or more obtained recoded images, and identifies the image that is in focus.Type: ApplicationFiled: April 20, 2010Publication date: June 30, 2011Inventors: Yufeng Mo, Tan Wang, Zhaohua Liu