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    Aerothermal radiation effect frequency domain correction method
    1.
    发明授权
    Aerothermal radiation effect frequency domain correction method 有权

    公开(公告)号：US10521888B2

    公开(公告)日：2019-12-31

    申请号：US16359990

    申请日：2019-03-20

    Applicant: Huazhong University of Science and Technology

    Inventor： Tianxu Zhang ,  Xuan Hou ,  Chuan Zhang ,  Li Liu ,  Quan Chen ,  Ao Zhong ,  Mingxing Xu ,  Yutian Zhou

    IPC: G06K9/00 ,  G06T5/00 ,  G06T5/10 ,  G06T5/20 ,  G06T5/40 ,  G06T7/136

    Abstract: An aerothermal-radiation correction method, including: using a Gaussian surface to approximate a thermal radiation noise, performing a Fourier transform on the Gaussian surface so as to obtain a centralized spectrum of the thermal radiation noise, constructing a filter function H based on the centralized spectrum of the thermal radiation noise; performing a Fourier transform on the aerothermal-radiation degraded image f so as to obtain a centralized spectrum F, taking dot product of F and H to obtain a filtered spectrum G; and performing an inverse Fourier transform on filtered spectrum G to obtain a modulus, and acquire a corrected image. The method effectively removes background noise generated by aerothermal radiation, greatly improves image quality and image signal-to-noise ratio. The method features reduced computational complexity and a shorter operation time, and is suited for real-time processing.

    Aerodynamic optical effect correction and identification integrated real-time processing system and method
    2.
    发明授权
    Aerodynamic optical effect correction and identification integrated real-time processing system and method 有权

    公开(公告)号：US10297013B2

    公开(公告)日：2019-05-21

    申请号：US15576847

    申请日：2016-04-13

    Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

    Inventor： Tianxu Zhang ,  Xuan Hou ,  Chuan Zhang ,  Li Liu ,  Quan Chen ,  Ao Zhong ,  Mingxing Xu ,  Yutian Zhou

    IPC: G06T5/00 ,  G06T5/10 ,  G06T7/73

    Abstract: An aerodynamic optical effect correction and identification integrated real-time processing system, comprising an FPGA module, a multi-core main processor DSP, a plurality of auxiliary processors ASICs and an infrared image non-uniformity correction system-on-chip (SoC). By means of the system, full-image thermal radiation correction, denoising, transmission effect correction and target detection processes of an aerodynamic optical effect degradation image are achieved. Correspondingly, provided is the corresponding method. The system effectively solves the problem of aerodynamic optical effect and the problem of the requirement for a short detection time interval of the processor in an aircraft flying at a high speed; due to the adoption of the independently researched and developed ASIC, the real-time property of the whole system is greatly improved; all tasks are rationally distributed and a multi-core parallel mode is adopted, so the image processing time is greatly shortened; and meanwhile, the FPGA module connects all units to form a closed-loop system, so that the system stability is further improved.

    Co-aperture broadband infrared optical system
    4.
    发明授权
    Co-aperture broadband infrared optical system 有权

    公开(公告)号：US09651763B2

    公开(公告)日：2017-05-16

    申请号：US15106699

    申请日：2015-02-10

    Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

    Inventor： Hong Zhang ,  Jindong Fei ,  Tlanxu Zhang ,  Xiaobing Dai ,  Xlangyan Liu ,  Li Liu

    IPC: G02B13/14 ,  G02B17/08 ,  G02B7/182 ,  G01J3/28 ,  G02B1/11 ,  G02B27/00 ,  G02B27/14

    CPC classification number: G02B17/0808 ,  G01J3/2823 ,  G02B1/11 ,  G02B7/182 ,  G02B13/146 ,  G02B27/0025 ,  G02B27/142

    Abstract: The present invention discloses a co-aperture broadband infrared optical system, belonging to the field of infrared optical system. The system realizes long wave infrared (LWIR) imaging and broadband infrared spectrum measurement, and solves the problems of limited optical path layout, large volume and high cost of an optical system. The present invention includes a Cassegrain lens, a spectroscope, a reflector, several lens groups, an FPA interface and an optical fiber interface. Light (2 μm˜12 μm) is incident to the Cassegrain lens to be focused, then is split by the spectroscope, where 50% of the LWIR light (8 μm˜10 μm) passes through the lens group for aberration correction, and the image plane is focused again at the imaging interface. The other 50% of the LWIR light (8 μm˜10 μm) and the infrared reflected light (2 μm˜8 μm and 10 μm˜12 μm) pass through the lens group, and are reflected by the reflector, then focused at the optical fiber interface. The present invention is compact in overall structure and convenient and flexible to use, has relatively low cost, and can be integrated into an image-spectrum associated detection device to implement automatic detection and tracking, which can be widely used in civil and military fields such as environmental monitoring and infrared guidance.

    METHOD FOR PTYCHOGRAPHY POSITION CORRECTION BASED ON PROBE WEIGHTING
    7.
    发明申请
    METHOD FOR PTYCHOGRAPHY POSITION CORRECTION BASED ON PROBE WEIGHTING 有权

    公开(公告)号：US20240377626A1

    公开(公告)日：2024-11-14

    申请号：US18346255

    申请日：2023-07-02

    Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

    Inventor： Honggang Gu ,  Lei Zhong ,  Shiyuan Liu ,  Li Liu

    IPC: G02B21/06 ,  G02B21/36

    Abstract: The disclosure provides a method for ptychography position correction based on probe weighting. The method includes: collecting diffraction light field intensity information and simultaneously initializing information functions of illumination probes and a sample to be tested and probe positions; obtaining and importing an exit wave into a propagation model to obtain a simulated diffraction light field and replacing the diffraction light field intensity information to obtain an updated diffraction light field; importing the updated diffraction light field into a backpropagation model and obtaining a diffraction exit wave and updating the information functions of the sample to be tested and the illumination probes at each scan position; and forming a probe matrix around the probe positions, updating the probe positions after calculating a correlation, and repeating the above steps to iterate until the predetermined number of iterations is completed or a predetermined condition is reached.

    De-noising system for remote images of ground buildings using spectrum constraints and de-noising method thereof
    8.
    发明授权
    De-noising system for remote images of ground buildings using spectrum constraints and de-noising method thereof 有权
    使用频谱约束和去噪方法对地面建筑物远距离图像进行去噪系统

    公开(公告)号：US09563939B2

    公开(公告)日：2017-02-07

    申请号：US14964559

    申请日：2015-12-09

    Applicant: Huazhong University of Science and Technology

    Inventor： Tianxu Zhang ,  Zheng Wang ,  Li He ,  Li Liu ,  Xuan Hou ,  Chuan Zhang ,  Sufei Fan ,  Yimeng Chen

    IPC: G06T5/00 ,  G06T7/00 ,  G06T5/10

    CPC classification number: G06T5/002 ,  G06T5/10 ,  G06T7/11 ,  G06T7/136 ,  G06T7/155 ,  G06T2207/20056 ,  G06T2207/30184

    Abstract: A de-noising method for remote images of ground buildings using spectrum constraints. The method includes: 1) obtaining a reference image of ground buildings from a remote image database of the ground buildings, performing a Fourier transformation on the reference image to obtain an amplitude spectrum, and performing a threshold segmentation, an erosion operation and a dilation operation successively on the amplitude spectrum to obtain a binary template of spectrum of the ground buildings; and 2) obtaining a real-time image of the ground buildings by a high-speed aircraft, performing a Fourier transformation on the real-time image to obtain a spectrum, filtering the spectrum of the real-time image in frequency domain by the binary template of spectrum of the ground buildings, and performing an inverse Fourier transformation thereon to generate a filtered real-time image of the ground buildings.

    Abstract translation: 使用频谱约束的地面建筑物远距离图像的去噪方法。 该方法包括：1）从地面建筑物的远程图像数据库获取地面建筑物的参考图像，对参考图像进行傅立叶变换以获得振幅谱，并执行阈值分割，侵蚀操作和扩张操作 连续振幅谱，得到地面建筑物光谱二元模板; 和2）通过高速飞行器获得地面建筑物的实时图像，对实时图像进行傅立叶变换以获得频谱，通过二进制码对频域中的实时图像的频谱进行滤波 地面建筑物的光谱模板，并对其进行逆傅里叶变换，以产生地面建筑物的滤波实时图像。

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