Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "L4X0:0277 786X "

Sökning: L4X0:0277 786X

Sortera/gruppera träfflistan
  • Ahmad, Naeem, et al. (författare)
  • Cost Optimization of a Sky Surveillance Visual Sensor Network
  • 2012
  • Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - Belgium : SPIE - International Society for Optical Engineering. - 978-0-8194-9129-9 ; s. Art. no. 84370U
  • Konferensbidrag (refereegranskat)abstract
    • A Visual Sensor Network (VSN) is a network of spatially distributed cameras. The primary difference between VSN and other type of sensor network is the nature and volume of information. A VSN generally consists of cameras, communication, storage and central computer, where image data from multiple cameras is processed and fused. In this paper, we use optimization techniques to reduce the cost as derived by a model of a VSN to track large birds, such as Golden Eagle, in the sky. The core idea is to divide a given monitoring range of altitudes into a number of sub-ranges of altitudes. The sub-ranges of altitudes are monitored by individual VSNs, VSN1 monitors lower range, VSN2 monitors next higher and so on, such that a minimum cost is used to monitor a given area. The VSNs may use similar or different types of cameras but different optical components, thus, forming a heterogeneous network.  We have calculated the cost required to cover a given area by considering an altitudes range as single element and also by dividing it into sub-ranges. To cover a given area with given altitudes range, with a single VSN requires 694 camera nodes in comparison to dividing this range into sub-ranges of altitudes, which requires only 96 nodes, which is 86% reduction in the cost.
  • Andler, Sten F, et al. (författare)
  • SMARTracIn : a concept for spoof resistant tracking of vessels and detection of adverse intentions
  • 2009
  • Ingår i: Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense VIII. - SPIE - International Society for Optical Engineering. - 9780819475718 ; s. 73050G-1-73050G-9
  • Konferensbidrag (refereegranskat)abstract
    • The aim of maritime surveillance systems is to detect threats earlyenough to take appropriate actions. We present the results ofa study on maritime domain awareness performed during the fallof 2008. We analyze an identified capability gap of worldwidesurveillance in the maritime domain, and report from a userworkshop addressing the identified gap. We describe a SMARTracIn conceptsystem that integrates information from surveillance systems with background knowledgeon normal conditions to help users detect and visualize anomaliesin vessel traffic. Land-based systems that cover the coastal watersas well as airborne, space-borne and ships covering open seaare considered. Sensor data are combined with intelligence information fromship reporting systems and databases. We describe how information fusion,anomaly detection and semantic technology can be used to helpusers achieve more detailed maritime domain awareness. Human operators area vital part of this system and should be activecomponents in the fusion process. We focus on the problemof detecting anomalous behavior in ocean-going traffic, and a roomand door segmentation concept to achieve this. This requires theability to identify vessels that enter into areas covered bysensors as well as the use of information management systemsthat allow us to quickly find all relevant information.
  • Bornefalk, Hans (författare)
  • Use of phase and certainty information in automatic detection of stellate patterns in mammograms : IMAGE PROCESSING, PTS 1-3
  • 2004
  • Konferensbidrag (refereegranskat)abstract
    • Detection of stellate patterns is a very important step in computer-aided detection schemes designed for mammography. We introduce a new way of finding these regions based on the use of quadrature filters. The method allows extraction of a certainty measure for each orientation estimate. This makes the method of finding the areas the spicules seem to emanate from more robust than simply basing it on the orientation estimates themselves. The local phase extracted from the filter outputs allows us to discriminate between orientation estimates from edges and dark lines from those generated by bright line structures, i.e. spicules. This makes the method more specific. We also show how the method can be modified for finding non-spiculated masses in digitized mammograms.
  • Brunnström, Kjell, et al. (författare)
  • Simulator Sickness analysis of 3D video viewing on passive 3D TV
  • 2013
  • Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - 978-0-8194-9421-4 ; s. Art. no. 864802
  • Konferensbidrag (refereegranskat)abstract
    • The MPEG 3DV project is working on the next generation video encoding standard and in this process a call for proposal of encoding algorithms was issued. To evaluate these algorithm a large scale subjective test was performed involving Laboratories all over the world. For the participating Labs it was optional to administer a slightly modified Simulator Sickness Questionnaire (SSQ) from Kennedy et al (1993) before and after the test. Here we report the results from one Lab (Acreo) located in Sweden. The videos were shown on a 46 inch film pattern retarder 3D TV, where the viewers were using polarized passive eye-glasses to view the stereoscopic 3D video content. There were 68 viewers participating in this investigation in ages ranges from 16 to 72, with one third females. The questionnaire was filled in before and after the test, with a viewing time ranging between 30 min to about one and half hour, which is comparable to a feature length movie. The SSQ consists of 16 different symptoms that have been identified as important for indicating simulator sickness. When analyzing the individual symptoms it was found that Fatigue, Eye-strain, Difficulty Focusing and Difficulty Concentrating were significantly worse after than before. SSQ was also analyzed according to the model suggested by Kennedy et al (1993). All in all this investigation shows a statistically significant increase in symptoms after viewing 3D video especially related to visual or Oculomotor system.
  • Cavdar, Cicek, et al. (författare)
  • Cutting the Electric Bill by Routing and Wavelength Assignment with Time-zones and Time-of-use Prices
  • 2011
  • Ingår i: NETWORK ARCHITECTURES, MANAGEMENT, AND APPLICATIONS IX. - 978-0-81948-958-6 ; s. 831014
  • Konferensbidrag (refereegranskat)abstract
    • We consider an energy-aware WDM core network, where the electric prices direr according to time intervals of the day, referred to as time-of-use rates. Since a large backbone network may have nodes scattered over several time zones, we exploit the time-of-use rates to lower the electric bill of the network provider. By using an ILP formulation of the bill minimization problem, we investigate the gain of total electric bill over two approaches where capacity and energy are optimized under different network traffic load conditions.
  • Chen, Jiajia, et al. (författare)
  • Advances in Fiber Access Networks Development : Efficient Resource Allocation and Cost Effective Protection
  • 2011
  • Ingår i: BROADBAND ACCESS COMMUNICATION TECHNOLOGIES V. - 978-0-81948-495-6 ; s. 795808-1-795808-10
  • Konferensbidrag (refereegranskat)abstract
    • Access networks based on optical fiber can easily fulfill high bandwidth demand and cover large service areas. Fiber access networks are also scalable to meet the future capacity request. Among several alternatives, passive optical network (PON)is considered as the most promising one, because its passive point-to-multipoint architecture is characterized by relatively low deployment and operational cost. On the other hand, the passive point-to-multipoint feature in PONs also creates a number of challenges, such as efficient resource allocation and cost-effective protection. This paper provides an overview of the advances related to these two issues and points out the research topics that are still open and need to be investigated.
  • Chen, Xi, et al. (författare)
  • Photothermal phenomena in plasmonics and metamaterials
  • 2011
  • Ingår i: ADVANCES IN OPTICAL THIN FILMS IV. - 978-0-81948-794-0 ; s. 81681K
  • Konferensbidrag (refereegranskat)abstract
    • Our recent theoretical and experimental investigation of the photothermal effect in a planar metamaterial absorber is reviewed in the present paper. The observed ultrasensitive photothermal heating in such an absorber nanostructure irradiated by a pulsed white-light source is elaborated with a simple yet compelling heat transfer model, which is subsequently solved with a finite-element method. The simulation results not only agree with the experimental finding, but also provide more detailed understanding of the temperature transition in the complex system.
  • Dahlbom, Anders, et al. (författare)
  • Towards Template-based Situation Recognition
  • 2009
  • Ingår i: Intelligent Sensing, Situation Management, Impact Assessment, and Cyber-Sensing : Proceedings of SPIE Defense, Security, and Sensing 2009. - SPIE. - 9780819476180 ; s. Article ID 735205
  • Konferensbidrag (refereegranskat)abstract
    • The process of tracking and identifying developing situations is an ability of importance within the surveillance domain. We refer to this as situation recognition and believe that it can enhance situation awareness for decision makers. Situation recognition requires that many subproblems are solved. For instance, we need to establish which situations are interesting, how to represent these situations, and which inferable events and states that can be used for representing them. We also need to know how to track and identify situations and how to determine the correlation between present information about situations with knowledge. For some of these subproblems, data-driven approaches are suitable, whilst knowledge-driven approaches are more suitable for others. In this paper we discuss our current research efforts and goals concerning template-based situation recognition. We provide a categorization of approaches for situation recognition together with a formalization of the template-based situation recognition problem. We also discuss this formalization in the light of a pick-pocket scenario. Finally, we discuss future directions for our research on situation recognition. We conclude that situation recognition is an important problem to look into for enhancing the overall situation awareness of decision makers.
  • Dahlman, Nils, et al. (författare)
  • Evaluation of photon-counting spectral breast tomosynthesis
  • 2011
  • Konferensbidrag (refereegranskat)abstract
    • We have designed a mammography system that for the first time combines photon-counting spectral imaging with tomosynthesis. The present study is a comprehensive physical evaluation of the system; tomosynthesis, spectral imaging, and the combination of both are compared using an ideal-observer model that takes anatomical noise into account. Predictions of signal and noise transfer through the system are verified by contrast measurements on a tissue phantom and 3D measurements of MTF and NPS. Clinical images acquired with the system are discussed in view of the model predictions.
Skapa referenser, mejla, bekava och länka
fritt online (13)
Typ av publikation
konferensbidrag (261)
proceedings (redaktörskap) (1)
Typ av innehåll
refereegranskat (185)
övrigt vetenskapligt (77)
Sjödahl, Mikael, (17)
Thylén, Lars (12)
Danielsson, Mats, (12)
Wosinski, Lech, (11)
Qiu, Min, (9)
Gren, Per, (9)
visa fler...
Osten, Wolfgang (9)
Lourdudoss, Sebastia ... (8)
Molin, Nils-Erik, (8)
Hammar, Mattias, (8)
Bornefalk, Hans, (8)
Fredenberg, Erik, (7)
Cederström, Björn, (7)
Niklaus, Frank, (6)
Lundqvist, Mats (6)
Laurell, Fredrik, (5)
Stemme, Göran, (5)
Lindgren, Mikael (5)
Pasiskevicius, Valda ... (5)
Dubrova, Elena, (5)
Sarady, Istvan, (5)
Åslund, Magnus, (5)
Marcinkevicius, Saul ... (4)
Holmström, Petter (4)
Berggren, Jesper, (4)
Friberg, Ari T., (4)
Lehmann, Peter H. (4)
Anand, Srinivasan, (4)
Wang, Q., (4)
Xu, Cheng, (4)
Wernersson, Åke, (4)
Dainese, Matteo, (4)
Westergren, Urban, (4)
Willander, Magnus, (3)
Gustafsson, Oscar, (3)
Wosinska, Lena, (3)
Tiihonen, Mikael, (3)
Aggerstam, Thomas, (3)
Maguire Jr., Gerald ... (3)
Olsson, Roger, (3)
Svensson, Christer (3)
Noz, Marilyn E., (3)
Schatz, Richard, (3)
Berrier, Audrey, (3)
Stepinski, Tadeusz, (3)
Albertazzi, Armando (3)
Mulot, Mikael, (3)
Swillo, Marcin, (3)
Andersen, Torben (3)
Synnergren, Per, (3)
visa färre...
Kungliga Tekniska Högskolan (138)
Luleå tekniska universitet (62)
Uppsala universitet (22)
Linköpings universitet (21)
Mittuniversitetet (14)
Högskolan i Skövde (3)
visa fler...
Högskolan i Halmstad (3)
Chalmers tekniska högskola (2)
Umeå universitet (2)
Örebro universitet (2)
Lunds universitet (2)
Göteborgs universitet (2)
Malmö högskola (1)
Mälardalens högskola (1)
Högskolan i Jönköping (1)
visa färre...
Engelska (261)
Svenska (1)
Ämne (HSV)
Naturvetenskap (86)
Teknik (78)
Medicin och hälsovetenskap (8)


pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy