Video Systems and Components

2021 ◽  
pp. 201-219
Author(s):  
Jeromy Hopgood
Keyword(s):  
Video Systems

scholarly journals A Novel Mobile Video Community Discovery Scheme Using Ontology-Based Semantical Interest Capture

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Ruiling Zhang ◽  
Shengwu Xiong
Keyword(s):  
Network Virtualization ◽  
Estimation Algorithm ◽  
Mobile Video ◽  
Mobile Nodes ◽  
Community Discovery ◽  
Video Sharing ◽  
Video Systems ◽  
Estimate Method ◽  
Common Interests ◽  
Word Selection

Leveraging network virtualization technologies, the community-based video systems rely on the measurement of common interests to define and steady relationship between community members, which promotes video sharing performance and improves scalability community structure. In this paper, we propose a novel mobile Video Community discovery scheme using ontology-based semantical interest capture (VCOSI). An ontology-based semantical extension approach is proposed, which describes video content and measures video similarity according to video key word selection methods. In order to reduce the calculation load of video similarity, VCOSI designs a prefix-filtering-based estimation algorithm to decrease energy consumption of mobile nodes. VCOSI further proposes a member relationship estimate method to construct scalable and resilient node communities, which promotes video sharing capacity of video systems with the flexible and economic community maintenance. Extensive tests show how VCOSI obtains better performance results in comparison with other state-of-the-art solutions.

A Hierarchical Access Control Scheme Based on Lagrange Interpolation and ELGamal Algorithm with Numerical Experiments

2013 ◽  
Vol 385-386 ◽  
pp. 1705-1707
Author(s):  
Tzer Long Chen ◽  
Yu Fang Chung ◽  
Jian Mao Hong ◽  
Jeng Hong Jhong ◽  
Chin Sheng Chen ◽  
...  
Keyword(s):  
Access Control ◽  
Lagrange Interpolation ◽  
Control Mechanism ◽  
Key Generation ◽  
Electronic Documents ◽  
Control Scheme ◽  
Video Systems ◽  
Efficient Scheme ◽  
On Line ◽  
Access Control Mechanism

It is important to notice that the access control mechanism has been widely applied in various areas, such as on-line video systems, wireless network, and electronic documents. We propose an access control mechanism which is constructed based on two mathematical fundamentals: Lagrange interpolation and ElGamal algorithm. We conduct performance analysis to compare the efficiency of our proposed scheme with that of several related published schemes in both key generation phase and key derivation phase. Our new scheme is proven to be more efficient. It is shown, as expected, a more efficient scheme provides relatively less security and a more secure scheme is relatively less efficient for private keys of the same size.

The Design of Firing Mechanism Controlling Research of Natural Gas Vehicle Cylinder

2013 ◽  
Vol 333-335 ◽  
pp. 2044-2051
Author(s):  
Wei Pu Xu ◽  
Yi Ting Liu
Keyword(s):  
Natural Gas ◽  
Data Acquisition ◽  
Wireless Network ◽  
Fire Test ◽  
General Idea ◽  
Security Risks ◽  
Controlled System ◽  
Video Systems ◽  
Computer Controlled ◽  
Natural Gas Vehicle

This article described the current situation and the security risks of the natural gas vehicle cylinders, which introduced the principle of the fire test, proposed the general idea of the fire test equipment. Wireless network, video systems, data acquisition systems and computer-controlled system of the equipment researching are also introduced.

Use of stereo baited remote underwater video systems to estimate the presence and size of white sharks (Carcharodon carcharias)

2017 ◽  
Vol 68 (7) ◽  
pp. 1391 ◽  
Author(s):  
D. Harasti ◽  
K. A. Lee ◽  
R. Laird ◽  
R. Bradford ◽  
B. Bruce
Keyword(s):  
Relative Abundance ◽  
Fish Assemblages ◽  
New South ◽  
Underwater Video ◽  
Carcharodon Carcharias ◽  
South Wales ◽  
Video Systems ◽  
Near Shore ◽  
Number Of Individuals ◽  
Non Destructive

Stereo baited remote underwater video systems (stereo-BRUVs) are commonly used to assess fish assemblages and, more recently, to record the localised abundance and size of sharks. The present study investigated the occurrence and size of white sharks (Carcharodon carcharias) in the near-shore environment off Bennett’s Beach, part of a known nursery area for the species in central New South Wales, Australia. Six stereo-BRUV units were deployed approximately fortnightly between August and December 2015 for periods of 5h in depths of 7–14m. Stereo-BRUVs successfully recorded 34 separate sightings of 22 individual white sharks. The highest number of individuals detected during a single day survey was eight. All C. carcharias observed on stereo-BRUVs were juveniles ranging in size from 1.50 to 2.46-m total length (mean±s.e., 1.91±0.05m; n=22). The time to first appearance ranged from 15 to 299min (mean±s.e., 148±15min). This study demonstrates that the use of stereo-BRUVs is a viable, non-destructive method to obtain estimates of the size and presence of white sharks, and may be useful in estimating relative abundance in near-shore environments where white sharks are known to frequent.

Stereoscopic Visualization in Endoscopic Surgery: Problems, Benefits, and Potentials

1997 ◽  
Vol 6 (2) ◽  
pp. 198-217 ◽  
Author(s):  
Cletus von Pichler ◽  
Klaus Radermacher ◽  
Wieland Boeckmann ◽  
Günter Rau ◽  
Gerhard Jakse
Keyword(s):  
Visual Perception ◽  
Endoscopic Surgery ◽  
New Technology ◽  
Field Studies ◽  
3D Video ◽  
Video Endoscopy ◽  
Starting Point ◽  
Video Systems ◽  
Visualization Systems ◽  
Stereoscopic Visualization

In recent years the application of 3D video endoscopic systems in clinical routine, especially in the field of endoscopic surgery, has increased steadily. The number of 3D video endoscopic systems used in the operating theatre today is obviously lower than the number of established traditional 2D video endoscopic systems. The hesitant application of the new technology can be mainly explained by the lack of evaluation of its influence on the surgical procedure and on patient benefit as well as by the need for specific economic analysis. The starting point for our investigations was to analyze the influence of 3D video endoscopy on endoscopically guided manipulations in general. In order to achieve quantitative statements we performed laboratory experiments using human factors analyzing methods. In the next step we performed clinical field studies of the application of 3D video endoscopic systems for a side-by-side comparison of 2D and 3D systems. These studies showed that the use of 3D video endoscopy has an improving influence on endoscopically guided surgical manipulations as well as on the intraoperative procedures. We also found that spatial visual perception of stereoscopic images of 3D video systems may cause problems for some users. For the validation of stereoscopic visualization systems we additionally studied the influence of isolated technical, optical, and physiological parameters on visual perception as well as on transposition into visually guided manipulations. Detailed results of these investigations concerning the influence of 3D video endoscopy on binocular perception are presented.

scholarly journals Progress In Design and Applications Of CCD Cameras For Electron Microscopy

1995 ◽  
Vol 3 (10) ◽  
pp. 12-13 ◽  
Author(s):  
Kenneth H. Downing
Keyword(s):  
High Sensitivity ◽  
Ccd Cameras ◽  
Video Cameras ◽  
Quantum Leap ◽  
Fluorescent Screen ◽  
Lower Beam ◽  
Video Systems ◽  
On Line ◽  
Specimen Quality ◽  
Electron Microscopes

Over the last several years the long-awaited revolution in direct-digital readout systems has begun, with the introduction of efficient slow-scan CCD cameras. Earlier, the introduction of video cameras to electron microscopes had brought a quantum leap in the speed and efficiency of carrying out a host of operations. The high sensitivity of the video cameras provided the ability to see the image in much more detail and at a lower beam intensity than had been previously possible by viewing the fluorescent screen. The ability to assess, on line, characteristics such as specimen quality and image focus, even qualitatively, gave feedback to the operator that previously took hours to obtain. Due to the low resolution of these video systems, however, they were rarely useful for data recording.

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