公开(公告)号：US20190220958A1

公开(公告)日：2019-07-18

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: 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.

公开(公告)号：US20180350041A1

公开(公告)日：2018-12-06

申请号：US15577335

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 ,  G06T5/40 ,  G06T5/10

CPC classification number: G06T5/00

Abstract: An aerothermal radiation effect frequency domain correction method, comprising: use a Gaussian surface to approximate a thermal radiation noise, perform a Fourier transform on the thermal radiation noise to obtain an amplitude spectrum, then normalize and segment the amplitude spectrum to obtain a filter thresholding template, BW, then use the filter thresholding template, BW, to construct a filter function, H; perform a Fourier transform on an image degraded by aerodynamic thermal radiation, f, to obtain a centralized frequency spectrum, F, then take the dot product of F and H to obtain a real-time image frequency spectrum, G; and perform an inverse Fourier transform on G to obtain a modulus, and acquire an image corrected for thermal radiation, g. Using the method effectively removes background noise generated by aerothermal radiation to restore a clear image, greatly improving image quality and image signal-to-noise ratio. The method further features reduced computational complexity and a shorter operation time, and is therefore better suited for real-time processing.

公开(公告)号：US20180293709A1

公开(公告)日：2018-10-11

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

CPC classification number: G06T5/002 ,  G06T5/00 ,  G06T5/009 ,  G06T5/10 ,  G06T2207/20056

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.

公开(公告)号：US20160189349A1

公开(公告)日：2016-06-30

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 ,  G06T5/40 ,  G06F17/30 ,  G06T5/20

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。

公开(公告)号：US20180286017A1

公开(公告)日：2018-10-04

申请号：US15562887

申请日：2016-04-13

Applicant: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Tianxu ZHANG ,  Chuan ZHANG ,  Xuan HOU ,  Li LIU ,  Quan CHEN ,  Ao ZHONG ,  Mingxing XU ,  Yutian ZHOU

IPC: G06T5/00 ,  G06T5/50 ,  G06T7/00

CPC classification number: G06T5/002 ,  G06T5/00 ,  G06T5/50 ,  G06T7/0002 ,  G06T2207/10048 ,  G06T2207/20024 ,  G06T2207/20182

Abstract: Disclosed in the present invention is a contrast constrained aerothermal radiation correction method. By analyzing features of images at different intensities of aerothermal radiation, it has been discovered that the stronger the aerothermal radiation effect is, the smaller the image contrast becomes, and when thermal radiation correction is performed using a gradient fitting algorithm, it has been discovered that time consumption thereof grows exponentially with an increase in a degree of a fitting surface and with an increase in an image size. The present invention can rapidly and effectively restore an aerothermal radiation image, remarkably improving a signal to noise ratio and quality of the image.