Browsing School of Information Sciences by Title

Now showing items 9-28 of 162

  • Bag-of-visual-words vs global image descriptors on two-stage multimodal retrieval 

    Zagoris, Konstantinos; Chatzichristofis, Savvas A.; Arampatzis, Avi (ACM SIGIR 2011, 2011)
    The Bag-Of-Visual-Words (BOVW) paradigm is fast becoming a popular image representation for Content-Based Image Retrieval (CBIR), mainly because of its better retrieval effectiveness over global feature representations ...

  • Blockchain Applications in the Biomedical Domain: A Scoping Review 

    Drosatos, George; Kaldoudi, Eleni (Computational and Structural Biotechnology Journal, 2019)
    Blockchain is a distributed, immutable ledger technology introduced as the enabling mechanism to support cryptocurrencies. Blockchain solutions are currently being proposed to address diverse problems in different domains. ...

  • Blockchain-based Consents Management for Personal Data Processing in the IoT Ecosystem 

    Rantos, Konstantinos; Drosatos, George; Demertzis, Konstantinos; Ilioudis, Christos; Papanikolaou, Alexandros (2018)
    In the Internet of Things (IoT) ecosystem the volume of data generated by devices in the user’s environment is constantly increasing and becoming of particular value. In such an environment the average user is bound to ...

  • A Blockchain-Based Notarization Service for Biomedical Knowledge Retrieval 

    Kleinaki, Athina-Styliani; Mytis-Gkometh, Petros; Drosatos, George; Efraimidis, Pavlos S.; Kaldoudi, Eleni (Elsevier Ltd., 2018-08)
    Biomedical research and clinical decision depend increasingly on scientific evidence realized by a number of au-thoritative databases, mostly public and continually enriched via peer scientific contributions. Given the ...

  • A Blockchain-Based Platform for Consent Management of Personal Data Processing in the IoT Ecosystem 

    Rantos, Konstantinos; Drosatos, George; Kritsas, Antonios; Ilioudis, Christos; Papanikolaou, Alexandros; Filippidis, Adam P. (Wiley, 2019-10-17)
    A signifcant proportion of Internet of Tings (IoT) devices, which according to published reports will be more than 75 billion by 2025 [1], will soon surround users and will collect data that are likely to threaten users’ ...

  • Capturing Provenance, Evolution and Modification of Clinical Protocols via a Heterogeneous, Semantic Social Network 

    Portokallidis, Nick; Drosatos, George; Kaldoudi, Eleni (IOS Press, 2016)
    Healthcare delivery is largely based on medical best practices as in clinical protocols. Research so far has addressed the computerized execution of clinical protocols by developing a number of related representation ...

  • CEDD: Color and Edge Directivity Descriptor: A Compact Descriptor for Image Indexing and Retrieval 

    Chatzichristofis, Savvas A.; Boutalis, Yiannis (Springer-Verlag, 2008)
    This paper deals with a new low level feature that is extracted from the images and can be used for indexing and retrieval. This feature is called “Color and Edge Directivity Descriptor” and incorporates color and texture ...

  • Cellular Automata Ants 

    Bitsakidis, Nikolaos P.; Dourvas, Nikolaos I.; Chatzichristofis, Savvas A.; Sirakoulis, Georgios Ch. (Springer, 2017)
    During the last decades much attention was given to bio-inspired techniques able to successfully handle really complex algorithmic problems. As such Ant Colony Optimization (ACO) algorithms have been introduced as a ...

  • Co.Vi.Wo.: Color Visual Words Based on Non-Predefined Size Codebooks 

    Chatzichristofis, Savvas A.; Iakovidou, Chryssanthi; Boutalis, Yiannis; Marques, Oge (IEEE, 2012)
    Due to the rapid development of information technology and the continuously increasing number of available multimedia data, the task of retrieving information based on visual content has become a popular subject of scientific ...

  • Color and Edge Directivity Descriptor on GPGPU 

    Iakovidou, Chrysanthi; Bampis, L.; Chatzichristofis, Savvas A.; Boutalis, Yiannis; Amanatiadis, A. (IEEE (Computer Society), 2015)
    Image indexing refers to describing the visual multimedia content of a medium, using high level textual information or/and low level descriptors. In most cases, images and videos are associated with noisy and incomplete ...

  • Combining Color and Spatial Color Distribution Information in a Fuzzy Rule Based Compact Composite Descriptor 

    Chatzichristofis, Savvas A.; Boutalis, Yiannis S.; Lux, Mathias (Springer, 2011)
    In this paper, a novel low level feature for content based image retrieval is presented. The proposed feature structure combines color and spatial color distribution information. The combination of these two features in ...

  • Combining Syntactic and Semantic Evidence for Improving Matching over Linked Data Sources 

    Christodoulou, Klitos; Fernandes, Alvaro A.A.; Paton, Norman W. (Springer Link, 2015-11)
    In the context of Linked Data (LD) sources, the ability to traverse links and retrieve further information can be exploited to harvest semantic annotations. Such annotations can, in turn, underpin the inference of semantic ...

  • Communicating Personalized Risk Factors for Lifestyle Coaching 

    Drosatos, George; Bakirlis, Kyriakos; Efraimidis, Pavlos S.; Kaldoudi, Eleni (2018)
    Chronic non-communicable diseases such as diabetes, chronic cardiorenal and respiratory disease and cancer, are serious, burdensome and costly conditions that share a common characteristic: they heavily depend on common ...

  • CoMo: A Compact Composite Moment-Based Descriptor for Image Retrieval 

    Vassou, Sotiris A.; Anagnostopoulos, Nektarios; Amanatiadis, Angelos; Christodoulou, Klitos; Chatzichristofis, Savvas A. (ACM, 2017-06-19)
    Low level features play a vital role in image retrieval. Image moments can effectively represent global information of image content while being invariant under translation, rotation, and scaling. This paper briefly presents ...

  • CoMo: a scale and rotation invariant compact composite moment-based descriptor for image retrieval 

    Vassou, S. A.; Anagnostopoulos, N.; Amanatiadis, A.; Chatzichristofis, Savvas A.; Christodoulou, Klitos (Springer International Publishing, 2018-03-01)
    Low level features play a significant role in image retrieval. Image moments can effectively represent global information of image content while being invariant under translation, rotation, and scaling. This paper presents ...

  • Comparative Performance Evaluation of Image Descriptors Over IEEE 802.11b NoisyWireless Networks 

    Chatzistavros, Evaggelos; Chatzichristofis, Savvas A.; Stamatellos, Georgios; Zagoris, Konstantinos (IEEE (Computer Society), 2011)
    Abstract—In this paper we evaluate the image retrieval procedure over an IEEE 802.11b Ad Hoc network, operating in 2.4GHz, using IEEE Distributed Coordination Function CSMA/CA as the multiple access scheme. IEEE 802.11 ...

  • Composite description based on Salient Contours and Color information for CBIR tasks 

    Iakovidou, C.; Anagnostopoulos, N.; Lux, M.; Christodoulou, Klitos; Boutalis, Y.; Chatzichristofis, Savvas A. (Institute of Electrical and Electronics Engineers (IEEE), 2019)
    This paper introduces a novel image descriptor for content based image retrieval tasks that integrates contour and color information into a compact vector. Loosely inspired by the human visual system and its mechanisms in ...

  • A conceptual architecture for empowering responsible online gambling with predictive, real-time, persuasive and interactive intervention 

    Drosatos, George; Nalmpantis, Fotios; Baines, Victoria; Bolat, Elvira; Vuillier, Laura; Kostoulas, Theodoros; Arden-Close, Emily; McAlaney, John; Phalp, Keith; Ali, Raian (University of Waterloo, 2018)
    Online gambling, unlike other mediums of addiction and problematic behaviour, such as tobacco and alcohol, offers unprecedented opportunities for monitoring and understanding an addict's behaviour in real-time and adapting ...

  • Content Based Image Retrieval Using Visual-Words Distribution Entropy 

    Chatzichristofis, Savvas A.; Iakovidou, Chrysanthi; Boutalis, Yiannis (Springer, 2011)
    Bag-of-visual-words (BOVW) is a representation of images which is built using a large set of local features. To date, the experimental results presented in the literature have shown that this approach achieves high retrieval ...

  • Content based MRSI image indexing and retrieval involving a fuzzy descriptor 

    Chatzichristofis, Savvas A.; Boutalis, Yiannis; Karras, D. A.; Mertzios, B. G. (Institute of Electrical and Electronics Engineers (IEEE), United States, 2010)
    Magnetic resonance spectroscopic imaging (MRSI) integrates both spectroscopic and imaging methods to produce spatially localized spectra from within the sample or patient. Although MRSI is a relatively new imaging technology ...