scholarly journals Real-Time Diffraction Field Calculation Methods for Computer-Generated Holograms

2019 ◽  
Author(s):  
Gokhan Bora Esmer
Keyword(s):  
Real Time ◽  
Diffraction Field ◽  
Field Calculation ◽  
Calculation Methods ◽  
Computer Generated Holograms

Real-time photorealistic computer-generated holograms based on backward ray tracing and wavefront recording planes

2018 ◽  
Vol 429 ◽  
pp. 12-17 ◽  
Author(s):  
Yuan Wang ◽  
Xinzhu Sang ◽  
Zhidong Chen ◽  
Hui Li ◽  
Linmin Zhao
Keyword(s):  
Real Time ◽  
Ray Tracing ◽  
Computer Generated Holograms

A Novel Constraint Specification of Weakly Hard Real-Time System Based on Fixed Sliding Window

2013 ◽  
Vol 475-476 ◽  
pp. 1161-1166
Author(s):  
Xu Dong Zhu ◽  
Hui You Chang
Keyword(s):  
Real Time ◽  
Sliding Window ◽  
The Novel ◽  
Calculation Methods ◽  
Time System ◽  
Real Time System ◽  
Constraint Specification ◽  
Minimum Probability ◽  
System Constraint ◽  
Hard Real Time

This paper puts forward a novel constraint specification. By limitations on the maximum of consecutive miss of deadline and the minimum probability of meeting deadline on the fixed sliding window s×m, the novel constraint specification has three contributions to the research of the weakly hard real-time system constraint specification. Firstly, has configurable flexible parameters which can easily realize all hard real-time, soft real-time and weakly hard real-time only by changing the parameters. Secondly, replacing the "fixed sliding window" with the "any" window, the novel constraint specification not only simplify the calculation of real-time, which will reduce the time consume, but also broaden the application scope such as smoothly scheduling. Moreover, the fixed sliding window is helpful to find a schedulable μ-pattern. Thirdly, the novel constraint specification solves the invalidity of some constraint specification when the first invocation of task is lost or missed. Through analysis and experiments, the results demonstrate that our novel constraint specification outperform previous approaches in both calculation methods and application scopes.

Real-Time Display Of 3-D Computer Data Using Computer Generated Holograms

1989 ◽  
Author(s):  
Hamid Farhoosh ◽  
Yashaiahu Fainman ◽  
Kristopher Urquhart ◽  
Sing H. Lee
Keyword(s):  
Real Time ◽  
Computer Data ◽  
Computer Generated Holograms

scholarly journals The Spec-Radiation Method as a Fast Alternative to the Re-Radiation Method for the Detection of Flaws in Wooden Particleboards

2020 ◽  
Vol 10 (19) ◽  
pp. 6663 ◽  
Author(s):  
Andreas Sebastian Schmelt ◽  
Jens Twiefel
Keyword(s):  
Real Time ◽  
Ultrasonic Testing ◽  
Sound Field ◽  
Calculation Methods ◽  
Radiation Method ◽  
Non Destructive ◽  
Time Evaluation ◽  
Sub Wavelength

For real-time evaluation of non-destructive air-coupled ultrasonic testing of wood-based materials, efficient and reliable calculation methods from ultrasonic holography are essential. Presented here is the spec-radiation method as a fast alternative to the re-radiation method. The spec-radiation method offers a more accurate and up to 88% faster evaluation than the re-radiation method for the determination of flaws in particleboards. Flaws of sub-wavelength sizes can be identified and their shape and location can be determined with this method. The spec-radiation method produces a better reproduction of the sound field than the re-radiation method, especially in the area of the measuring plane.

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