Exploiting intervoxel covariance as prior information in millimeter-wave computational imaging systems

2020 ◽  
Author(s):  
Naren Viswanathan ◽  
David Schurig
Keyword(s):  
Millimeter Wave ◽  
Prior Information ◽  
Computational Imaging ◽  
Imaging Systems

scholarly journals Roadmap of Terahertz Imaging 2021

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4092
Author(s):  
Gintaras Valušis ◽  
Alvydas Lisauskas ◽  
Hui Yuan ◽  
Wojciech Knap ◽  
Hartmut G. Roskos
Keyword(s):  
Room Temperature ◽  
Continuous Wave ◽  
Computational Imaging ◽  
Imaging Systems ◽  
Thz Imaging ◽  
Operational Conditions ◽  
Frequency Combs ◽  
Wave Imaging ◽  
On Chip ◽  
Nano Imaging

In this roadmap article, we have focused on the most recent advances in terahertz (THz) imaging with particular attention paid to the optimization and miniaturization of the THz imaging systems. Such systems entail enhanced functionality, reduced power consumption, and increased convenience, thus being geared toward the implementation of THz imaging systems in real operational conditions. The article will touch upon the advanced solid-state-based THz imaging systems, including room temperature THz sensors and arrays, as well as their on-chip integration with diffractive THz optical components. We will cover the current-state of compact room temperature THz emission sources, both optolectronic and electrically driven; particular emphasis is attributed to the beam-forming role in THz imaging, THz holography and spatial filtering, THz nano-imaging, and computational imaging. A number of advanced THz techniques, such as light-field THz imaging, homodyne spectroscopy, and phase sensitive spectrometry, THz modulated continuous wave imaging, room temperature THz frequency combs, and passive THz imaging, as well as the use of artificial intelligence in THz data processing and optics development, will be reviewed. This roadmap presents a structured snapshot of current advances in THz imaging as of 2021 and provides an opinion on contemporary scientific and technological challenges in this field, as well as extrapolations of possible further evolution in THz imaging.

Super-Resolution Restoration for Image Based on Entropy Constraint and Projection onto Convex Set

2012 ◽  
Vol 468-471 ◽  
pp. 1041-1048 ◽  
Author(s):  
Xiao Qin Li ◽  
Kang Ling Fang ◽  
Can Jin
Keyword(s):  
Convergence Rate ◽  
Millimeter Wave ◽  
Convex Set ◽  
Super Resolution ◽  
Reconstruction Algorithm ◽  
Spatial Domain ◽  
Imaging Systems ◽  
Resolution Limit ◽  
Classical Algorithm ◽  
Restoration Algorithm

Super-resolution reconstruction for image breaks through the resolution limit of imaging systems without hardware change. The algorithm of projection onto convex set (POCS) is a typical super-resolution reconstruction algorithm in spatial domain. The classical algorithm of POCS lacks the overall constraint for the image, and the convergence rate for iteration is incontrollable. A new super-resolution restoration algorithm for image based on entropy constraint and POCS is proposed in this paper, and experiments with optical and millimeter wave images demonstrate that the new algorithm is effective in improving the precision of super-resolution restoration.

scholarly journals Performance Enhancement of Inexpensive Glow Discharge Detector Operating in Up-Conversion Mode in Millimeter Wave Detection for Focal Plane Arrays

2021 ◽  
Vol 11 (20) ◽  
pp. 9564
Author(s):  
Arun Ramachandra Kurup ◽  
Daniel Rozban ◽  
Lidor Kahana ◽  
Amir Abramovich ◽  
Yitzhak Yitzhaky ◽  
...  
Keyword(s):  
Glow Discharge ◽  
Millimeter Wave ◽  
Performance Enhancement ◽  
Signal To Noise Ratio ◽  
Focal Plane Arrays ◽  
Imaging Systems ◽  
Pass Filter ◽  
Detailed Derivation ◽  
Glow Discharge Detector ◽  
Thz Sensor

Performance enhancement of a very inexpensive millimeter-wave (MMW)/terahertz (THz) sensor for MMW/THz imaging systems is experimentally demonstrated in this study. The MMW sensor is composed of a glow discharge detector (GDD) and a light-to-frequency (LTF) converter combination. The experimental results given in this study show an improvement in the performance parameters of the detector element, such as the minimum detectable signal, as well as the signal to noise ratio (SNR) and the noise equivalent power (NEP), when a NIR long-pass filter was inserted between the GDD and the LTF combination. A detailed derivation of the NEP of this unique sensor is presented in this work. Based on this derivation and the experimental measurements, the NEP value was calculated.

scholarly journals Reducing complexity in computational imaging systems

2003 ◽  
Vol 11 (18) ◽  
pp. 2102 ◽  
Author(s):  
Kenneth Kubala ◽  
Edward Dowski ◽  
W. Cathey
Keyword(s):  
Computational Imaging ◽  
Imaging Systems

Low-cost space-varying FIR filter architecture for computational imaging systems

2010 ◽  
Author(s):  
Guotong Feng ◽  
Mohammed Shoaib ◽  
Edward L. Schwartz ◽  
M. Dirk Robinson
Keyword(s):  
Low Cost ◽  
Fir Filter ◽  
Computational Imaging ◽  
Imaging Systems ◽  
Filter Architecture
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