scholarly journals A Space-Variant Deblur Method for Focal-Plane Microwave Imaging

2018 ◽  
Vol 8 (11) ◽  
pp. 2166
Author(s):  
Shenshen Luan ◽  
Shuguo Xie ◽  
Tianheng Wang ◽  
Xuchun Hao ◽  
Meiling Yang ◽  
...  
Keyword(s):  
Point Spread Function ◽  
Focal Plane ◽  
Imaging System ◽  
Millimetre Wave ◽  
Point Spread ◽  
Processing Step ◽  
Wide Range ◽  
Spread Function ◽  
Polar Coordinate ◽  
Space Variant

In the research of passive millimetre wave (PMMW) imaging, the focal plane array (FPA) can realize fast, wide-range imaging and detection. However, it has suffered from a limited aperture and off-axis aberration. Thus, the result of FPA is usually blurred by space-variant point spread function (SVPSF) and is hard to restore. In this paper, a polar-coordinate point spread function (PCPSF) model is presented to describe the circle symmetric characteristic of space-variant blur, and a log-polar-coordinate transformation (LPCT) method is propagated as the pre-processing step before the Lucy–Richardson algorithm to eliminate the space variance of blur. Compared with the traditional image deblur method, LPCT solves the problem by analyzing the physical model instead of the approximating it, which has proved to be a feasible way to deblur the FPA imaging system.

A Splicing Method of Sectioned Restoration Algorithm for Images with Space-Variant Point Spread Function

2009 ◽  
Vol 29 (3) ◽  
pp. 648-653 ◽  
Author(s):  
陶小平 Tao Xiaoping ◽  
冯华君 Feng Huajun ◽  
雷华 Lei Hua ◽  
李奇 Li Qi ◽  
徐之海 Xu Zhihai
Keyword(s):  
Point Spread Function ◽  
Point Spread ◽  
Restoration Algorithm ◽  
Spread Function ◽  
Space Variant

Measurement of the Point Spread Function of a Photoacoustic Imaging System using Step Method

2013 ◽  
Vol 33 (4) ◽  
pp. 0411002
Author(s):  
周红仙 Zhou Hongxian ◽  
周有平 Zhou Youping ◽  
王毅 Wang Yi
Keyword(s):  
Point Spread Function ◽  
Imaging System ◽  
Photoacoustic Imaging ◽  
Step Method ◽  
Point Spread ◽  
Spread Function

Point Spread Function Model of Grating Imaging System Based on Boltzmann Function Edge Fitting

2020 ◽  
Vol 40 (14) ◽  
pp. 1405003
Author(s):  
卢泉 Lu Quan ◽  
张泽昊 Zhang Zehao ◽  
张卫平 Zhang Weiping ◽  
刘诣荣 Liu Yirong
Keyword(s):  
Point Spread Function ◽  
Imaging System ◽  
Function Model ◽  
Point Spread ◽  
Boltzmann Function ◽  
Spread Function

Point Spread Function of Pinhole Imaging System for Deviating from Center of Incident γ-Ray

2015 ◽  
Vol 44 (3) ◽  
pp. 311004
Author(s):  
马庆力 MA Qing-li ◽  
唐世彪 TANG Shi-biao ◽  
吴彦华 WU Yan-hua
Keyword(s):  
Point Spread Function ◽  
Imaging System ◽  
Point Spread ◽  
Spread Function ◽  
Pinhole Imaging ◽  
Γ Ray

Effect of point spread function position bias in wavefront coding infrared imaging system

2020 ◽  
Vol 22 (2) ◽  
pp. 025703
Author(s):  
Bin Feng ◽  
Zelin Shi ◽  
Haizheng Liu ◽  
Yaohong Zhao ◽  
Jianlei Zhang
Keyword(s):  
Point Spread Function ◽  
Infrared Imaging ◽  
Imaging System ◽  
Position Bias ◽  
Point Spread ◽  
Infrared Imaging System ◽  
Wavefront Coding ◽  
Spread Function

scholarly journals Fourier optics approach to imaging with sub-wavelength resolution through metal-dielectric multilayers

2010 ◽  
Vol 18 (4) ◽  
Author(s):  
R. Kotyński
Keyword(s):  
Point Spread Function ◽  
Imaging System ◽  
Diffraction Theory ◽  
Spatial Filter ◽  
Fourier Optics ◽  
Point Spread ◽  
Spread Function ◽  
Point Spread Function Engineering ◽  
Wavelength Resolution ◽  
Sub Wavelength

AbstractMetal-dielectric layered stacks for imaging with sub-wavelength resolution are regarded as linear isoplanatic systems — a concept popular in Fourier optics and in scalar diffraction theory. In this context, a layered flat lens is a one-dimensional spatial filter characterised by the point spread function. However, depending on the model of the source, the definition of the point spread function for multilayers with sub-wavelength resolution may be formulated in several ways. Here, a distinction is made between a soft source and hard electric or magnetic sources. Each of these definitions leads to a different meaning of perfect imaging. It is shown that some simple interpretations of the PSF, such as the relation of its width to the resolution of the imaging system are ambiguous for the multilayers with sub-wavelenth resolution. These differences must be observed in point spread function engineering of layered systems with sub-wavelength sized PSF.

Estimating the point spread function of an imaging system using wavefront measurement

2016 ◽  
Author(s):  
Hongjun Mao ◽  
Yonghui Liang ◽  
Zongfu Huang ◽  
Jin Liu ◽  
Pengzhi Jiang
Keyword(s):  
Point Spread Function ◽  
Imaging System ◽  
Point Spread ◽  
Wavefront Measurement ◽  
Spread Function
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