High Dynamic Imaging of Luminous Massive Stars

2003 ◽  
Vol 8 ◽  
pp. 49-54
Author(s):  
F. Vakili
Keyword(s):  
Massive Stars ◽  
Dynamic Imaging ◽  
High Dynamic

High Dynamic Imaging for Photometry and Graphic Arts Evaluation

2018 ◽  
Vol 99 (4) ◽  
pp. 383-389
Author(s):  
Sudheer Kumar T. S. ◽  
Ciji Pearl Kurian ◽  
Kumara Shama ◽  
Shailesh K. R.
Keyword(s):  
Dynamic Imaging ◽  
Graphic Arts ◽  
High Dynamic

scholarly journals Attention Mechanism Based Semi-Supervised Multi-Gain Image Fusion

Symmetry ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 451
Author(s):  
Ming Fang ◽  
Xu Liang ◽  
Feiran Fu ◽  
Yansong Song ◽  
Zhen Shao
Keyword(s):  
Image Fusion ◽  
Network Structure ◽  
Dynamic Range ◽  
High Dynamic Range ◽  
Dynamic Imaging ◽  
Motion Artifacts ◽  
Attention Mechanism ◽  
Source Image ◽  
Fused Image ◽  
High Dynamic

High-dynamic range imaging technology is an effective method to improve the limitations of a camera’s dynamic range. However, most current high-dynamic imaging technologies are based on image fusion of multiple frames with different exposure levels. Such methods are prone to various phenomena, for example motion artifacts, detail loss and edge effects. In this paper, we combine a dual-channel camera that can output two different gain images simultaneously, a semi-supervised network structure based on an attention mechanism to fuse multiple gain images is proposed. The proposed network structure comprises encoding, fusion and decoding modules. First, the U-Net structure is employed in the encoding module to extract important detailed information in the source image to the maximum extent. Simultaneously, the SENet attention mechanism is employed in the encoding module to assign different weights to different feature channels and emphasis important features. Then, a feature map extracted from the encoding module is input to the decoding module for reconstruction after fusing by the fusion module to obtain a fused image. Experimental results indicate that the fused images obtained by the proposed method demonstrate clear details and high contrast. Compared with other methods, the proposed method improves fused image quality relative to several indicators.

scholarly journals High-dynamic imaging system for real-time detection of illuminance by Vehicle Head lamps

OSA Continuum ◽  
2021 ◽  
Author(s):  
SHIH-KANG Lin ◽  
LI-WEI Hsiao ◽  
CHIH-SHOU WU ◽  
Quang-Khoi Nguyen ◽  
Ching-Cherng Sun ◽  
...  
Keyword(s):  
Real Time ◽  
Imaging System ◽  
Dynamic Imaging ◽  
High Dynamic ◽  
Real Time Detection

Description and visualization of the highly dynamic behavior of the electrorheological effect

2019 ◽  
Vol 31 (2) ◽  
pp. 308-317
Author(s):  
Tobias Bauerochs ◽  
Xiaoye Huo ◽  
Gilad Yossifon ◽  
Stephan Ulrich ◽  
Steffen Schneider ◽  
...  
Keyword(s):  
Electric Field ◽  
High Speed ◽  
Dynamic Range ◽  
Electrorheological Fluid ◽  
High Dynamic Range ◽  
Dynamic Imaging ◽  
Particle Behavior ◽  
Electrorheological Effect ◽  
High Dynamic ◽  
Field Lines

When an electrorheological fluid is located between two electrodes and an electrical voltage is applied to them, the particles in the fluid move and form chains along the electric field lines. This phenomenon is called the electrorheological effect. The exact behavior of the particles has not yet been studied completely. Some optical investigations of particle motion or behavior have been performed, but did not take into account the high dynamic range directly after the application of an electric field. This study is intended to help explain how the particles behave when they encounter an electric field and then try to align themselves with it. There is an investigation into how these chains develop in a microchannel within milliseconds. For this purpose, the particle behavior of the electrorheological fluid is investigated with high dynamic imaging using a microscope. A high-speed camera records videos of the first milliseconds at 3000 fps synchronously with the application of an electric field. The results provide a better understanding of the chain formation and particle behavior of the electrorheological effect in the high dynamic range and can be used for the design of electrorheological applications as well as simulations of the particle movement.

High-dynamic-range interferometric bragg-cell spectrum analyser

1986 ◽  
Vol 133 (1) ◽  
pp. 26
Author(s):  
J. Mellis ◽  
G.R. Adams ◽  
K.D. Ward
Keyword(s):  
Dynamic Range ◽  
High Dynamic Range ◽  
Spectrum Analyser ◽  
High Dynamic

Contrast-Enhanced Ultrasound: a Simple and Effective Tool in Defining a Rapid Diagnostic Work-up for Small Nodules Detected in Cirrhotic Patients during Surveillance

2016 ◽  
Vol 25 (2) ◽  
pp. 205-211 ◽  
Author(s):  
Antonio Giorgio ◽  
Luca Montesarchio ◽  
Piero Gatti ◽  
Ferdinando Amendola ◽  
Paolo Matteucci ◽  
...  
Keyword(s):  
Predictive Value ◽  
Imaging Modality ◽  
Dynamic Imaging ◽  
Contrast Enhanced Ultrasound ◽  
Histologic Diagnosis ◽  
Therapeutic Work ◽  
Contrast Enhanced ◽  
Arterial Vascularization ◽  
Cirrhotic Patients ◽  
Work Up

  Background & Aims: Disappearance of portal blood flow and arterial vascularization is the hallmark of hepatocarcinogenesis. The capability of a dynamic imaging modality detecting arterial hypervascularization of small nodules is crucial to promote a rapid diagnostic and therapeutic work-up improving survival. We aimed to evaluate the capability of CEUS to detect arterial vascularization of ≤ 2 cm HCC nodules arising during surveillance so as to shorten the diagnostic and therapeutic work-up. Methods: From October 2009 to September 2014, among 1757 consecutive cirrhotic patients under surveillance with ultrasound (US), 243 patients had new single nodules 7-20 mm; 229/243 had a conclusive histologic diagnosis and comprised the study group. All patients underwent CEUS followed by enhanced MRI and US guided percutaneous 18G needle core biopsy of the nodules. Of the 229 nodules, 27 were hyperechoic, 171 hypoechoic and 31 isoechoic lesions. Results: The histology results revealed that 199/229 nodules were HCC and 30 were benign. Of 199 HCC, CEUS evidenced arterial hypervascularity in 190 nodules (95.5%) (sensitivity 94.48 %, specificity 100%, PPV 100%, NPV 76.92 %). Of the 39 CEUS arterial-unenhanced nodules, 30 were benign and 9 (23%) were well-differentiated HCC. eMRI showed arterial hypervascularity in 199 nodules (86,9%). Of these, only 193 (97%) were histologically HCCs while 6 were benign (sensitivity: 97%, specificity: 80%, PPV: 97%, NPV: 80%). Conclusions: CEUS has a great capability to detect arterial hypervascularity of small HCC. Because only 4.5% of new nodules escape the demonstration of arterial hyervascularity, CEUS must be performed immediately after conventional US to contrast the malignant fate of small lesions arising in a cirrhotic liver.. Abbreviations: CEUS: contrast-enhanced ultrasound; CT: computed tomography; HCC: hepatocellular carcinoma;MRI: magnetic resonance; NPV: negative predictive value; PPV: positive predictive value; US: ultrasonography.

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