Browsing Conference papers by Title

Now showing items 1-20 of 85

  • Accelerating Image Retrieval Using Binary Haar Wavelet Transform on the Color and Edge Directivity Descriptor 

    Chatzichristofis, Savvas A.; Boutalis, Yiannis; Arampatzis, Avi (Institute of Electrical and Electronics Engineers (IEEE), United States, 2010)
    In this paper, a new accelerating technique for content-based image retrieval is proposed, suitable for the Color and Edge Directivity Descriptor (CEDD). To date, the experimental results presented in the literature ...

  • ADvoCATE: A Consent Management Platform for Personal Data Processing in the IoT Using Blockchain Technology 

    Rantos, Konstantinos; Drosatos, George; Demertzis, Konstantinos; Ilioudis, Christos; Papanikolaou, Alexandros; Kritsas, Antonios (International Conference on Security for Information Technology and Communications, 2018)
    The value of personal data generated and managed by smartdevices which comprise the Internet of Things (IoT) is unquestionable.The EU General Data Protection Regulation (GDPR) that has beenrecentlyput in force, sets the ...

  • Aggregating educational data for patient empowerment 

    Portokallidis, Nick; Drosatos, George; Kaldoudi, Eleni (2015)
    The aim of the proposed educational resource aggregator is to harvest educational resources from 3rd party repositories, present these to the medical expert for annotation and rating, and output the results of the annotation ...

  • Automatic Image Annotation and Retrieval Using the Joint Composite Descriptor 

    Zagoris, Konstantinos; Chatzichristofis, Savvas A.; Papamarkos, Nikos; Boutalis, Yiannis (Institute of Electrical and Electronics Engineers (IEEE), United States, 2010)
    Capable tools are needed in order to successfully search and retrieve a suitable image from large image collections. Many content-based image retrieval systems employ low-level image features such as color, texture and ...

  • Autonomous Navigation of Teams of Unmanned Aerial or Underwater Vehicles for Exploration of Unknown Static & Dynamic Environments 

    Kapoutsis, A. Ch.; Chatzichristofis, Savvas A.; Doitsidis, L.; Borges de Sousa, Joao; Kosmatopoulos, E. B. (MED’13, 2013)
    In this paper, we present a new approach that is able to efficiently and fully-autonomously navigate a team of Unmanned Aerial or Underwater Vehicles (UAUV’s) when deployed in exploration of unknown static and dynamic ...

  • 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-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 ...

  • 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 ...

  • 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 ...

  • 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 ...

  • 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 ...

  • 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 ...

  • Content based radiology image retrieval using a fuzzy rule based scalable composite descriptor 

    Chatzichristofis, Savvas A.; Boutalis, Yiannis (Springer Nature, 2009)
    The rapid advances made in the field of radiology, the increased frequency in which oncological diseases appear, as well as the demand for prevailing medical checks, led to the creation of a large database of radiology ...

  • A Decentralized Voting Mechanism: Engaging ERC-20 token holders in decision-making 

    Christodoulou, Panayiotis; Christodoulou, Klitos (IEEE, 2020-07-20)
    This paper presents a Blockchain-based voting mechanism that has the potential to disrupt current voting systems and fuel the development of decentralized governance. More specifically, the paper presents a study on the ...

  • Deriving the Political Affinity of Twitter Users from Their Followers 

    Stamatelatos, Giorgos; Gyftopoulos, Sotirios; Drosatos, George; Efraimidis, Pavlos S. (IEEE, 2018)
    In this work, we show that Twitter users can reveal valuable political information about particular Nodes of Interest (NOIs) they opt to follow. More precisely, we utilize an interesting graph projection method and a series ...

  • Distributed Multi-Robot Coverage using Micro Aerial Vehicles 

    Renzaglia, A.; Doitsidis, L.; Chatzichristofis, Savvas A.; Martinelli, A.; Kosmatopoulos, E. B. (IEEE (Computer Society), 2013)
    In this paper we present a solution to the problem of positioning a team of Micro Aerial Vehicles for a surveillance task in an environment of arbitrary and unknown morphology. The problem is addressed taking into account ...

  • Double Mobile sinks Architecture for WSN Data Gathering and Critical Events Detection 

    Khalifeh, Ala’; Abed, Husam; Darabkh, Khalid A.; Chatzichristofis, Savvas A.; Zinonos, Zinon (IEEE, 2020-06-17)
    Data gathering and critical events detection are two essential functionalities for Wireless Sensor Network (WSN). In this paper, we propose double mobile sinks network architecture, where two mobile sink nodes visit the ...