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  • 51.
    Sundstedt, Veronica
    et al.
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kreativa teknologier.
    Navarro, Diego
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kreativa teknologier.
    Mautner, Julian
    Stillalive Studios, SWE.
    Possibilities and challenges with eye tracking in video games and virtual reality applications2016Ingår i: SA 2016 - SIGGRAPH ASIA 2016 Courses, Association for Computing Machinery (ACM), 2016, artikel-id a17Konferensbidrag (Refereegranskat)
    Abstract [en]

    Due to an increase in affordable, reliable and non-intrusive eye trackers the technology has recently been used by the video game industry. This course offers participants the opportunity to get an update on research and developments in gaze-based interaction techniques in combination with other sensors. The course consists of three parts: (1) a review of eye tracking analysis and interaction in video games and virtual reality applications, (2) possibilities and challenges with gaze-based interaction, and (3) lessons learned from developing a commercial video game application using eye tracking along with alternative virtual reality technologies. This course is relevant for everyone who is interested in developing games that use eye tracking as an interaction device. The content is suitable for beginners or experienced delegates who want to learn more about the state of the art and future possibilities in eye tracking combined with other sensors as interaction devices. We believe that games and virtual reality applications have just started to incorporate these new techniques and further research and developments are needed in order to evaluate novel ways to enhance gameplay.

  • 52.
    Sveinsdottir, Thordis
    et al.
    Trilateral Research and Consulting, GBR.
    Wessels, Bridgette
    University of Sheffield, GBR.
    Smallwood, Rod
    University of Sheffield, GBR.
    Linde, Peter
    Blekinge Tekniska Högskola, Biblioteket.
    Kala, Vasso
    National Centre of Medical Documentation, GRC.
    Tsoukala, Victoria
    National Hellenic Research Foundation, GRC.
    Sondervan, Jeroen
    University of Amsterdam, NLD.
    Policy recommendations for Open Access to research data in Europe-Stakeholder values and ecosystems2014Ingår i: Information Services and Use, ISSN 0167-5265, E-ISSN 1875-8789, Vol. 34, nr 3-4, s. 331-333Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    RECODE will leverage existing networks, communities and projects to address challenges within the open access and data dissemination and preservation sector, and produce policy recommendations for open access to research data based on existing good practice. The open access to research data sector includes several different networks, initiatives, projects and communities that are fragmented by discipline, geography, stakeholder category (publishers, academics, repositories, etc.) as well as other boundaries. Many of these organisations are already addressing key barriers to open access to research data, such as stakeholder fragmentation, technical and infrastructural issues, ethical and legal issues, and state and institutional policy fragmentation. However, these organisations are often working in isolation or with limited contact with one another. RECODE will provide a space for European stakeholders interested in open access to research data to work together to provide common solutions for these issues. RECODE will culminate in a series of over-arching policy recommendations for a policy framework to support open access to European research data targeted at different stakeholders and policy-makers (http://www.recodeproject.eu). © 2014-IOS Press and the authors.

  • 53.
    Tran, Hung
    et al.
    Mälardalens högskola, SWE.
    Kaddoum, Georges
    Universite du Quebec a Montreal, CAN.
    Gagnon, Francois
    Universite du Quebec a Montreal, CAN.
    Sibomana, Louis
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
    Cognitive radio network with secrecy and interference constraints2017Ingår i: Physical Communication, ISSN 1874-4907, Vol. 22, s. 32-41Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper, we investigate the physical-layer security of a secure communication in single-input multiple-output (SIMO) cognitive radio networks (CRNs) in the presence of two eavesdroppers. In particular, both primary user (PU) and secondary user (SU) share the same spectrum, but they face with different eavesdroppers who are equipped with multiple antennas. In order to protect the PU communication from the interference of the SU and the risks of eavesdropping, the SU must have a reasonable adaptive transmission power which is set on the basis of channel state information, interference and security constraints of the PU. Accordingly, an upper bound and lower bound for the SU transmission power are derived. Furthermore, a power allocation policy, which is calculated on the convex combination of the upper and lower bound of the SU transmission power, is proposed. On this basis, we investigate the impact of the PU transmission power and channel mean gains on the security and system performance of the SU. Closed-form expressions for the outage probability, probability of non-zero secrecy capacity, and secrecy outage probability are obtained. Interestingly, our results show that the strong channel mean gain of the PU transmitter to the PU's eavesdropper in the primary network can enhance the SU performance.

  • 54.
    Törn, Johan
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kreativa teknologier.
    Comparison Between Two DifferentScreen Space Ambient OcclusionTechniques2017Självständigt arbete på grundnivå (kandidatexamen), 10 poäng / 15 hpStudentuppsats (Examensarbete)
    Abstract [en]

    Context. In this project a comparison between two screen space ambientocclusion techniques are presented. The techniques are Scalable AO (SAO)and Multiresolution SSAO (MSSAO) since they both are techniques thatuse mipmaps to accelerate their calculations.

    Objectives. The aim is to see how big the difference is between the resultsof these two techniques and a golden reference that is an object space raytraced texture that is created with mental ray in Maya and how long timethe computation takes.

    Methods. The comparisons between the AO textures that these techniquesproduce and the golden references are performed using Structural SimilarityIndex (SSIM) and Perceptual Image Difference (PDIFF).

    Results. On the lowest resolution, both techniques execute in about thesame time on average, except that SAO with the shortest distance is faster.The only effect caused by the shorter distance, in this case, is that moresamples are taken in higher resolution mipmap levels than when longerdistances are used. The MSSAO achieved a better SSIM value meaningthat MSSAO is more similar to the golden reference than SAO. As theresolution increases the SSIM value between both techniques become moresimilar with SAO getting a better value and MSSAO getting slightly worse,while the execution time for MSSAO has larger increases than SAO.

    Conclusions. It is concluded that MSSAO is better than SAO in lowerresolution while SAO is better in larger resolution. I would recommendthat SAO is used for indoor scenes where there are not many small geometryparts close to each other that should occlude each other. MSSAO shouldbe used for outdoor scenes with a lot of vegetation which has many smallgeometry parts close to each other that should occlude. At higher resolution,MSSAO takes longer computational time as compared with SAO, while atlower resolution the computational time is similar.

  • 55.
    Wen, Wei
    et al.
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
    Khatibi, Siamak
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kommunikationssystem.
    Back to basics: Towards novel computation and arrangement of spatial sensory in images2016Ingår i: Acta Polytechnica, ISSN 1210-2709, Vol. 56, nr 5, s. 409-416Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The current camera has made a huge progress in the sensor resolution and the low-luminance performance. However, we are still far from having an optimal camera as powerful as our eye is. The study of the evolution process of our visual system indicates attention to two major issues: the form and the density of the sensor. High contrast and optimal sampling properties of our visual spatial arrangement are related directly to the densely hexagonal form. In this paper, we propose a novel software-based method to create images on a compact dense hexagonal grid, derived from a simulated square sensor array by a virtual increase of the fill factor and a half a pixel shifting. After that, the orbit functions are proposed for a hexagonal image processing. The results show it is possible to achieve image processing operations in the orbit domain and the generated hexagonal images are superior, in detection of curvature edges, to the square images. We believe that the orbit domain image processing has a great potential to be the standard processing for hexagonal images.

  • 56.
    Wen, Wei
    et al.
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för kreativa teknologier. Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för teknik och estetik.
    Khatibi, Siamak
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för teknik och estetik.
    Virtual deformable image sensors: Towards to a general framework for image sensors with flexible grids and forms2018Ingår i: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 18, nr 6, artikel-id 1856Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Our vision system has a combination of different sensor arrangements from hexagonal to elliptical ones. Inspired from this variation in type of arrangements we propose a general framework by which it becomes feasible to create virtual deformable sensor arrangements. In the framework for a certain sensor arrangement a configuration of three optional variables are used which includes the structure of arrangement, the pixel form and the gap factor. We show that the histogram of gradient orientations of a certain sensor arrangement has a specific distribution (called ANCHOR) which is obtained by using at least two generated images of the configuration. The results showed that ANCHORs change their patterns by the change of arrangement structure. In this relation pixel size changes have 10-fold more impact on ANCHORs than gap factor changes. A set of 23 images; randomly chosen from a database of 1805 images, are used in the evaluation where each image generates twenty-five different images based on the sensor configuration. The robustness of ANCHORs properties is verified by computing ANCHORs for totally 575 images with different sensor configurations. We believe by using the framework and ANCHOR it becomes feasible to plan a sensor arrangement in the relation to a specific application and its requirements where the sensor arrangement can be planed even as combination of different ANCHORs. © 2018 by the authors. Licensee MDPI, Basel, Switzerland.

  • 57.
    Wiaderek, Krzysztof
    et al.
    Institute of Computer and Information Sciences, POL.
    Rutkowska, Danuta
    Institute of Computer and Information Sciences, POL.
    Rakus-Andersson, Elisabeth
    Blekinge Tekniska Högskola, Fakulteten för teknikvetenskaper, Institutionen för matematik och naturvetenskap.
    Image retrieval by use of linguistic description in databases2018Ingår i: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), Springer Verlag , 2018, Vol. 10842, s. 92-103Konferensbidrag (Refereegranskat)
    Abstract [en]

    In this paper, a new method of image retrieval is proposed. This concerns retrieving color digital images from a database that contains a specific linguistic description considered within the theory of fuzzy granulation and computing with words. The linguistic description is generated by use of the CIE chromaticity color model. The image retrieval is performed in different way depending on users’ knowledge about the color image. Specific database queries can be formulated for the image retrieval. © Springer International Publishing AG, part of Springer Nature 2018.

  • 58.
    Willemsen, Mattias
    Blekinge Tekniska Högskola, Fakulteten för datavetenskaper, Institutionen för datavetenskap.
    Evaluating player performance and usability of graphical FPS interfaces in VR2019Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
    Abstract [sv]

    Bakgrund. Vid design av grafiska användargränssnitt (GUI) till Virtual Reality kan inte alltid samma design användas som tidigare har använts i traditionella TV-spel. Ett tillvägagångssätt som ofta rekommenderas är att göra spelets GUI en del av spelvärlden men det är oklart om det är den bästa strategin när man väger in prestation, användbarhet, och preferens. Eftersom marknaden för Virtual Reality växer snabbt behövs mer forskning för att få en förståelse för hur grafiska användargränssnitt bör designas.

    Syfte. Detta examensarbete undersöker existerande klassifikationer av GUI:n och anpassar dem för VR. En metod för att jämföra de olika typerna av GUI väljs ut och slutsatser dras om hur de påverkar prestanda, användbarhet och preferens.

    Metod. Ett VR FPS-spel utvecklas och ett experiment designas baserat på det. Experimentet testar spelares prestanda med tre olika typer av GUI. Spelarna svarar även på enkäter om upplevd användbarhet och preferens.

    Resultat. Data från både prestanda och personlig preferens verkar förespråka Geometriskt GUI.

    Slutsatser. Metoden som ofta rekommenderas där spelets GUI arbetas in som en del av spelvärlden verkar inte alltid vara det bästa valet då det kan offra användbarhet och prestanda för inlevelse.

12 51 - 58 av 58
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