Brightness enhancement method for a high-intensity positron beam produced by an electron accelerator

2008 ◽  
Vol 103 (9) ◽  
pp. 094916 ◽  
Author(s):  
Nagayasu Oshima ◽  
Ryoichi Suzuki ◽  
Toshiyuki Ohdaira ◽  
Atsushi Kinomura ◽  
Takamitsu Narumi ◽  
...  
Keyword(s):  
High Intensity ◽  
Electron Accelerator ◽  
Positron Beam ◽  
Brightness Enhancement ◽  
Enhancement Method

Underwater Image Enhancement Method Combining color and Luminance

2020 ◽  
Vol 13 ◽  
Author(s):  
ZHAO Baiting ◽  
WANG Feng ◽  
JIA Xiaofen ◽  
GUO Yongcun ◽  
WANG Chengjun
Keyword(s):  
Image Enhancement ◽  
Color Space ◽  
Low Frequency ◽  
Brightness Enhancement ◽  
Color Distortion ◽  
Underwater Image ◽  
Enhancement Method ◽  
Frequency Components ◽  
Image Contour ◽  
Objective Indicators

Background:: Aiming at the problems of color distortion, low clarity and poor visibility of underwater image caused by complex underwater environment, a wavelet fusion method UIPWF for underwater image enhancement is proposed. Methods:: First of all, an improved NCB color balance method is designed to identify and cut the abnormal pixels, and balance the color of R, G and B channels by affine transformation. Then, the color correction map is converted to CIELab color space, and the L component is equalized with contrast limited adaptive histogram to obtain the brightness enhancement map. Finally, different fusion rules are designed for low-frequency and high-frequency components, the pixel level wavelet fusion of color balance image and brightness enhancement image is realized to improve the edge detail contrast on the basis of protecting the underwater image contour. Results:: The experiments demonstrate that compared with the existing underwater image processing methods, UIPWF is highly effective in the underwater image enhancement task, improves the objective indicators greatly, and produces visually pleasing enhancement images with clear edges and reasonable color information. Conclusion:: The UIPWF method can effectively mitigate the color distortion, improve the clarity and contrast, which is applicable for underwater image enhancement in different environments.

High Intensity Positron Beam Generation by Synchrotron Radiation

1994 ◽  
Vol 175-178 ◽  
pp. 137-140
Author(s):  
V.N. Belyaev ◽  
I.S. Voronchev ◽  
G.N. Kulipanov ◽  
A.N. Mikheev ◽  
A.N. Skrinsky
Keyword(s):  
Synchrotron Radiation ◽  
High Intensity ◽  
Positron Beam ◽  
Beam Generation

scholarly journals Study of Positronium in Low-k Dielectric Films by Means of 2D-Angular Correlation Experiments at a High-Intensity Slow-Positron Beam

2001 ◽  
Vol 363-365 ◽  
pp. 585-587 ◽  
Author(s):  
Th. Gessmann ◽  
M.P. Petkov ◽  
Marc H. Weber ◽  
Kelvin G. Lynn ◽  
K.P. Rodbell ◽  
...  
Keyword(s):  
Angular Correlation ◽  
High Intensity ◽  
Positron Beam ◽  
Dielectric Films ◽  
Slow Positron ◽  
Low K

Demonstration of the superconducting electron accelerator as a high‐intensity high‐resolution device

1973 ◽  
Vol 22 (11) ◽  
pp. 605-607 ◽  
Author(s):  
M.S. McAshan ◽  
K. Mittag ◽  
H.A. Schwettman ◽  
L.R. Suelzle ◽  
J.P. Turneaure
Keyword(s):  
High Resolution ◽  
High Intensity ◽  
Electron Accelerator

scholarly journals Numerical study of positron production with short-pulse high-intensity lasers

2014 ◽  
Vol 32 (1) ◽  
pp. 171-176 ◽  
Author(s):  
Vaclav Hanus ◽  
Ladislav Drska ◽  
Emmanuel d'Humieres ◽  
Vladimir Tikhonchuk
Keyword(s):  
High Intensity ◽  
Numerical Study ◽  
Short Pulse ◽  
Positron Beam ◽  
Absolute Number ◽  
Particle In Cell ◽  
Electron Positron ◽  
Electrons And Positrons ◽  
High Intensity Laser ◽  
Intensity Laser

AbstractOne-dimensional particle-in-cell and Monte-Carlo (FLUKA) simulation methods were used together, in order to investigate the production of positrons in lead targets, illuminated by a short-pulse high-intensity laser. The study is focused on lead targets of 1 mm thickness and more and pulses of intensity in the range 1019–1022 W/cm2. The calculations provided an estimate of an absolute number of positrons and the ratio of electrons and positrons emerging from the target. The thickness of the target is scaled in order to find an optimal thickness that could provide a neutral electron-positron beam.

Development of a high intensity low energy positron beam

1994 ◽  
Author(s):  
W. B. Waeber ◽  
M. Shi ◽  
D. Taqqu ◽  
U. Zimmermann ◽  
D. Gerola ◽  
...  
Keyword(s):  
High Intensity ◽  
Positron Beam ◽  
Low Energy

Slow positron beam production by a 14 MeV C.W. electron accelerator

1982 ◽  
Vol 201 (2-3) ◽  
pp. 287-290 ◽  
Author(s):  
M. Begemann ◽  
G. Gräff ◽  
H. Herminghaus ◽  
H. Kalinowsky ◽  
R. Ley
Keyword(s):  
Electron Accelerator ◽  
Positron Beam ◽  
Slow Positron ◽  
Beam Production
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