Patents by Inventor Guohua GU

Guohua GU 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).

  • Patent number: 11106029
    Abstract: An annular-irradiation high-resolution quantitative phase microimaging based on light intensity transfer equation is proposed here includes designing an annular aperture for the imaging system illumination; invoking the weak object approximation by using the parameters of annular illumination aperture and bright field microscopy to calculate a weak object optical transfer function (WOTF) on the basis of a partially coherent imaging theory; and collecting three intensity images by a camera and obtaining the quantitative phase image of object by resolving the light intensity transfer equation with a deconvolution algorithm.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: August 31, 2021
    Assignee: NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Qian Chen, Chao Zuo, Jiasong Sun, Shijie Feng, Yuzhen Zhang, Guohua Gu
  • Patent number: 11029144
    Abstract: A super-rapid three-dimensional measurement method and system based on an improved Fourier transform contour technique is disclosed.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: June 8, 2021
    Assignee: NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Qian Chen, Chao Zuo, Shijie Feng, Jiasong Sun, Yuzhen Zhang, Guohua Gu
  • Publication number: 20210112187
    Abstract: A high-illumination numerical aperture-based large field-of-view high-resolution microimaging device, and a method for iterative reconstruction, the device comprising an LED array (1), a stage (2), a condenser (3), a microscopic objective (5), a tube lens (6), and a camera (7), the LED array (1) being arranged on the forward focal plane of the condenser (3). Light emitted by the i-th lit LED unit (8) of the LED array (1) passes through the condenser (3) and converges to become parallel light illuminating a specimen (4) to be examined, which is placed on the stage (2); part of the diffracted light passing through the specimen (4) is collected by the microscopic objective (5), converged by the tube lens (6), and reaches the imaging plane of the camera (7), forming an intensity image recorded by the camera (1). The present device and method ensure controllable programming of the illumination direction, while also ensuring an illumination-numerical-aperture up to 1.
    Type: Application
    Filed: February 26, 2018
    Publication date: April 15, 2021
    Applicant: NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Qian CHEN, Chao ZUO, Jiasong SUN, Shijie FENG, Yuzhen ZHANG, Guohua GU
  • Publication number: 20210102801
    Abstract: A super-rapid three-dimensional measurement method and system based on an improved Fourier transform contour technique is disclosed.
    Type: Application
    Filed: February 26, 2018
    Publication date: April 8, 2021
    Applicant: NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Qian CHEN, Chao ZUO, Shijie FENG, Jiasong SUN, Yuzhen ZHANG, Guohua GU
  • Publication number: 20210103135
    Abstract: Annular-irradiation high-resolution quantitative phase microimaging based on light intensity transfer equation is proposed here. First, an annular aperture is designed for the imaging system illumination. And then, by invoking the weak object approximation, the parameters of annular illumination aperture and bright field microscopy are used to calculate a weak object optical transfer function (WOTF) on the basis of a partially coherent imaging theory. Finally, three intensity images are collected by a camera and the quantitative phase image of object is obtained by resolving the light intensity transfer equation with a deconvolution algorithm. The present method effectively resolves the tradeoff between the cloudy low-frequency noise and high-frequency fuzziness in the light intensity transfer equation, and the spatial imaging resolution of phase reconstruction is greatly increased.
    Type: Application
    Filed: February 26, 2018
    Publication date: April 8, 2021
    Applicant: NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Qian CHEN, Chao ZUO, Jiasong SUN, Shijie FENG, Yuzhen ZHANG, Guohua GU
  • Patent number: 10911672
    Abstract: A highly efficient three-dimensional image acquisition method based on multi-mode composite encoding and epipolar constraint, respectively using a fast imaging mode or a high-precision imaging mode, wherein in the fast imaging mode, two phase maps having different frequencies are obtained by four stripe gratings, and a high-frequency absolute phase is obtained by means of the epipolar constraint and a left-right consistency check, and the three-dimensional image is obtained by means of a mapping relationship between the phase and three-dimensional coordinates; and in the high precision imaging mode, two phases having different frequencies are obtained by means of N+2 stripe gratings, a low-frequency absolute phase is obtained by the epipolar constraint, and the unwrapping of a high-frequency phase is assisted by means of the low-frequency absolute phase, so as to obtain the high-frequency absolute phase, and finally, the three-dimensional image is obtained by the mapping relationship between the phase and the
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: February 2, 2021
    Assignee: NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Qian Chen, Chao Zuo, Shijie Feng, Jiasong Sun, Yuzhen Zhang, Guohua Gu
  • Publication number: 20200209604
    Abstract: The invention discloses a programmable annular LED illumination-based high efficiency quantitative phase microscopy imaging method, the proposed method comprising the following steps: the derivation of system optical transfer function in a partially coherent illumination imaging system; the derivation of phase transfer function with the weak object approximation under the illumination of tilted axially symmetric coherent point illumination source; the extension of illumination from an axially symmetric coherence point source to a discrete annular point source, and the optical transfer function can be treated as an incoherent superposition of each pair of tilted axially symmetric coherent point sources. The acquisition of raw intensity dataset; the implementation of deconvolution for quantitative phase reconstruction.
    Type: Application
    Filed: February 26, 2018
    Publication date: July 2, 2020
    Applicant: NANJING UNIVERSITY OF SCIENCE AND TECHNOLOGY
    Inventors: Qian CHEN, Chao Zuo, Jiasong SUN, Shijie FENG, Yuzhen ZHANG, Guohua GU
  • Publication number: 20200128180
    Abstract: A highly efficient three-dimensional image acquisition method based on multi-mode composite encoding and epipolar constraint, respectively using a fast imaging mode or a high-precision imaging mode, wherein in the fast imaging mode, two phase maps having different frequencies are obtained by four stripe gratings, and a high-frequency absolute phase is obtained by means of the epipolar constraint and a left-right consistency check, and the three-dimensional image is obtained by means of a mapping relationship between the phase and three-dimensional coordinates; and in the high precision imaging mode, two phases having different frequencies are obtained by means of N+2 stripe gratings, a low-frequency absolute phase is obtained by the epipolar constraint, and the unwrapping of a high-frequency phase is assisted by means of the low-frequency absolute phase, so as to obtain the high-frequency absolute phase, and finally, the three-dimensional image is obtained by the mapping relationship between the phase and the
    Type: Application
    Filed: February 26, 2018
    Publication date: April 23, 2020
    Applicant: Nanjing University of Science and Technology
    Inventors: Qian Chen, Chao Zuo, Shijie Feng, Jiasong Sun, Yuzhen Zhang, Guohua Gu
  • Patent number: 10135543
    Abstract: A clock recovery method is provided. The method has the following operations: performing clock balance pre-filtering on an input time/frequency domain signal according to a self-adaptive balance coefficient input currently, to obtain a balance pre-filtering signal; according to the balance pre-filtering signal, acquiring a phase error of the input time/frequency domain signal; and performing phase adjustment on the input time/frequency domain signal according to the phase error, and outputting a new self-adaptive balance coefficient after self-adaptive balance processing is performed on the phase-adjusted time/frequency domain signal. A clock recovery device and system and a non-transitory computer-readable storage medium are also provided.
    Type: Grant
    Filed: April 1, 2014
    Date of Patent: November 20, 2018
    Assignee: SANECHIPS TECHNOLOGY CO., LTD.
    Inventors: Yangzhong Yao, Yi Cai, Yunpeng Li, Guohua Gu, Wei Ren
  • Patent number: 9729232
    Abstract: Disclosed are a chromatic dispersion estimation method and device in optical coherent communication, wherein, the method includes: performing a fast Fourier transform on IQ-imbalance compensated data to obtain frequency-domain data in two polarization directions; calculating autocorrelation sequences of the frequency-domain data and performing an inverse fast Fourier transform on the values of the autocorrelation sequences; calculating modulus squares of the results of the inverse fast Fourier transform, and adding the results in the two polarization directions to obtain; determining a mean value of s of a plurality of data sets; calculating an index of the maximum value of, and estimating a dispersion value of the optical fiber link according to the index of the maximum value of. The abovementioned technical solution allows a significantly accurate and rapid estimation of dispersion values.
    Type: Grant
    Filed: May 23, 2014
    Date of Patent: August 8, 2017
    Assignees: ZTE CORPORATION, Sanechips Technology Co., Ltd.
    Inventors: Yangzhong Yao, Qiang Li, Yunpeng Li, Guohua Gu, Wei Ren
  • Publication number: 20160329970
    Abstract: A clock recovery method is provided. The method has the following operations: performing clock balance pre-filtering on an input time/frequency domain signal according to a self-adaptive balance coefficient input currently, to obtain a balance pre-filtering signal; according to the balance pre-filtering signal, acquiring a phase error of the input time/frequency domain signal; and performing phase adjustment on the input time/frequency domain signal according to the phase error, and outputting a new self-adaptive balance coefficient after self-adaptive balance processing is performed on the phase-adjusted time/frequency domain signal. A clock recovery device and system and a non-transitory computer-readable storage medium are also provided.
    Type: Application
    Filed: April 1, 2014
    Publication date: November 10, 2016
    Applicant: ZHONGXING MICROELECTRONICS TECHNOLOGY CO. LTD
    Inventors: Yangzhong YAO, Yi CAI, Yunpeng LI, Guohua GU, Wei REN
  • Publication number: 20160269108
    Abstract: Disclosed are a chromatic dispersion estimation method and device in optical coherent communication, wherein, the method includes: performing a fast Fourier transform on IQ-imbalance compensated data to obtain frequency-domain data in two polarization directions; calculating autocorrelation sequences of the frequency-domain data and performing an inverse fast Fourier transform on the values of the autocorrelation sequences; calculating modulus squares of the results of the inverse fast Fourier transform, and adding the results in the two polarization directions to obtain; determining a mean value of s of a plurality of data sets; calculating an index of the maximum value of, and estimating a dispersion value of the optical fiber link according to the index of the maximum value of. The abovementioned technical solution allows a significantly accurate and rapid estimation of dispersion values.
    Type: Application
    Filed: May 23, 2014
    Publication date: September 15, 2016
    Applicant: ZTE CORPORATION
    Inventors: Yangzhong YAO, Qiang LI, Yunpeng LI, Guohua GU, Wei REN