Numerical Solution for Radial Distortion Rectification in Optical Systems

2021 ◽  
pp. 319-333
Author(s):  
Obed I. Rios-Orellana ◽  
Rigoberto Juarez-Salazar ◽  
Victor H. Diaz-Ramirez
Keyword(s):  
Numerical Solution ◽  
Optical Systems ◽  
Radial Distortion ◽  
Distortion Rectification

DR-GAN: Automatic Radial Distortion Rectification Using Conditional GAN in Real-Time

2020 ◽  
Vol 30 (3) ◽  
pp. 725-733 ◽  
Author(s):  
Kang Liao ◽  
Chunyu Lin ◽  
Yao Zhao ◽  
Moncef Gabbouj
Keyword(s):  
Real Time ◽  
Radial Distortion ◽  
Distortion Rectification

Atomic Resolution in Crystal Aperture Stem

1990 ◽  
Vol 48 (1) ◽  
pp. 236-237
Author(s):  
J T Fourie
Keyword(s):  
Optical System ◽  
Spherical Aberration ◽  
Three Dimensional ◽  
Transmission Function ◽  
Optical Systems ◽  
Bragg Angle ◽  
Electron Optical System ◽  
Intimate Contact ◽  
Diffraction Effects ◽  
Design Aspect

The attempts at improvement of electron optical systems to date, have largely been directed towards the design aspect of magnetic lenses and towards the establishment of ideal lens combinations. In the present work the emphasis has been placed on the utilization of a unique three-dimensional crystal objective aperture within a standard electron optical system with the aim to reduce the spherical aberration without introducing diffraction effects. A brief summary of this work together with a description of results obtained recently, will be given.The concept of utilizing a crystal as aperture in an electron optical system was introduced by Fourie who employed a {111} crystal foil as a collector aperture, by mounting the sample directly on top of the foil and in intimate contact with the foil. In the present work the sample was mounted on the bottom of the foil so that the crystal would function as an objective or probe forming aperture. The transmission function of such a crystal aperture depends on the thickness, t, and the orientation of the foil. The expression for calculating the transmission function was derived by Hashimoto, Howie and Whelan on the basis of the electron equivalent of the Borrmann anomalous absorption effect in crystals. In Fig. 1 the functions for a g220 diffraction vector and t = 0.53 and 1.0 μm are shown. Here n= Θ‒ΘB, where Θ is the angle between the incident ray and the (hkl) planes, and ΘB is the Bragg angle.

SPATIAL AND TEMPORAL INSTABILITIES IN PASSIVE OPTICAL SYSTEMS

1988 ◽  
Vol 49 (C2) ◽  
pp. C2-343-C2-348
Author(s):  
L. A. LUGIATO ◽  
C. OLDANO ◽  
Kaige WANG ◽  
L. SANTIRANA ◽  
L. M. NARDUCCI ◽  
...  
Keyword(s):  
Optical Systems

Backscattering Analysis of Cylinder Shaped Scatterer in Vegetation Medium: Comparison Between Theories

2020 ◽  
Vol 2 (1) ◽  
pp. 15-18
Author(s):  
Syabeela Syahali ◽  
Ewe Hong Tat ◽  
Gobi Vetharatnam ◽  
Li-Jun Jiang ◽  
Hamsalekha A Kumaresan
Keyword(s):  
Numerical Solution ◽  
Cross Section ◽  
Traditional Method ◽  
Microwave Remote Sensing ◽  
Solution Model ◽  
Complex Nature ◽  
Good Match ◽  
Equivalent Source ◽  
Backscattering Cross Section ◽  
Method Model

This paper analyses the backscattering cross section of a cylinder both using traditional method model and a new numerical solution model, namely Relaxed Hierarchical Equivalent Source Algorithm (RHESA). The purpose of this study is to investigate the prospect of incorporating numerical solution model into volume scattering calculation, to be applied into microwave remote sensing in vegetation area. Results show a good match, suggesting that RHESA may be suitable to be used to model the more complex nature of vegetation medium.

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