Gradient-based optical flow techniques for tracking image motion due to atmospheric turbulence

2001 ◽  
Author(s):  
Ian Scott-Fleming ◽  
Keith Hege ◽  
David Clyde ◽  
Donald Fraser ◽  
Andrew Lambert
Keyword(s):  
Optical Flow ◽  
Atmospheric Turbulence ◽  
Image Motion ◽  
Gradient Based ◽  
Flow Techniques

scholarly journals Optical flow for large motion using gradient technique

2006 ◽  
Vol 3 (1) ◽  
pp. 103-113 ◽  
Author(s):  
Hossain Sarker ◽  
Kamal Bechkoum ◽  
K.K. Islam
Keyword(s):  
Optical Flow ◽  
Image Sequence ◽  
Object Motion ◽  
Two Dimensional ◽  
Optical Flow Method ◽  
Processing Step ◽  
Gradient Technique ◽  
Gradient Based ◽  
Large Motion ◽  
Flow Techniques

In this paper, we present the gradient-based optical flow method that estimates the two-dimensional velocity of object motion. a multi-resolution smoothing operation proposes in this paper as a pre-processing step for overcoming the difficulty of large motion estimation by gradient-based optical flow techniques. the effectiveness of the proposed method has confirmed by applying image sequence of large motion experimental results with an image sequence show a qualitative improvement.

Interferential seeing monitor, a seeing monitor for atmospheric turbulence studies: calibration with the differential image motion monitor

2020 ◽  
Vol 500 (2) ◽  
pp. 1884-1888
Author(s):  
Mohammed Sabil ◽  
A Habib ◽  
Z Benkhaldoun
Keyword(s):  
Structure Function ◽  
Atmospheric Turbulence ◽  
Wave Structure ◽  
Image Motion ◽  
Phase Fluctuations ◽  
Amplitude Fluctuations ◽  
Focus Plane ◽  
Cross Calibration ◽  
Double Slit ◽  
Good Agreement

ABSTRACT In this work, we aim to calibrate an interferential seeing monitor (ISM), which is a testing instument used at astronomical sites. Its method is based on the study of the diffraction pattern produced by a Young’s double-slit at the focus plane of a telescope. This method allows us to obtain the wave structure function by taking into account both phase and amplitude fluctuations of the light wavefront. A phase seeing εϕ was assigned to phase fluctuations and an amplitude seeing εχ was assigned to amplitude fluctuations (scintillation phenomenon), which allows us to obtain both phase and amplitude fluctuations. The feasibility of the ISM method was demonstrated by numerical simulations presented in a previous work. In this work, we have conducted a cross-calibration campaign of the ISM with a differential image motion monitor (DIMM) over 16 nights at the Oukaimeden and Atlas Golf Marrakech Observatories. The goal of this campaign was to study the reliability of this new method. In this paper, we present the calibration measurements and a comparison between the seeing measured by the ISM (εϕ, εχ) and that obtained by the DIMM (εdimm). These results show good agreement between the phase- eeing εϕ and εdimm.

A survey of variational and CNN-based optical flow techniques

2019 ◽  
Vol 72 ◽  
pp. 9-24 ◽  
Author(s):  
Zhigang Tu ◽  
Wei Xie ◽  
Dejun Zhang ◽  
Ronald Poppe ◽  
Remco C. Veltkamp ◽  
...  
Keyword(s):  
Optical Flow ◽  
Flow Techniques

scholarly journals Satellite Angular Velocity Estimation Based on Star Images and Optical Flow Techniques

Sensors ◽  
2013 ◽  
Vol 13 (10) ◽  
pp. 12771-12793 ◽  
Author(s):  
Giancarmine Fasano ◽  
Giancarlo Rufino ◽  
Domenico Accardo ◽  
Michele Grassi
Keyword(s):  
Angular Velocity ◽  
Optical Flow ◽  
Velocity Estimation ◽  
Angular Velocity Estimation ◽  
Star Images ◽  
Flow Techniques

Measurements of Atmospheric Turbulence from Image Motion of Laser Beam by Shack-Hartmann Wavefront Sensor

2019 ◽  
Author(s):  
Lidiia Bolbasova ◽  
Alexey Gritsuta ◽  
Vitaliy Lavrinov ◽  
Vladimir Lukin ◽  
Anton Selin ◽  
...  
Keyword(s):  
Laser Beam ◽  
Atmospheric Turbulence ◽  
Image Motion ◽  
Wavefront Sensor
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