Browsing Conference papers by Title

Now showing items 1-20 of 65

  • 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 ...

  • Accumulator-based built-in self-test generator for robustly detectable sequential fault testing 

    Voyiatzis, Ioannis; Kranitis, N.; Gizopoulos, D.; Paschalis, A.; Halatsis, Constantin (2004-11)
    In this paper an algorithm for the generation of single input change (SIC) pairs is presented, termed the accumulator-based SIC pair generation (ASG) algorithm; SIC pairs have been effectively utilised for testing robustly ...

  • An Affective Model for Personalized Learning in Adaptive Educational Hypermedia Systems 

    Leontidis, Makis; Halatsis, Constantin (2007)
    The educational process is a complicated interaction between the teacher, the student and the environment where it takes place. It is important for a successful educational transaction for the teacher to recognize the ...

  • ALU-based Built-In Self Test Generator for Transition Fault Testing 

    Voyiatzis, Y.; Kranitis, N.; Paschalis, A.; Gizopoulos, D.; Halatsis, Constantin (2002)
    The detection of transition faults in high-speed CMOS circuits if favored by the application of Single Input Change (SIC) pairs of patterns. A novel ALU-based SIC pair Generation (ASG) algorithm is presented that can be ...

  • Architectural considerations for a microprogrammable emulating engine using bit-slices 

    Halatsis, Constantin; Van Dam, A.; Joosten, J.; Letheren, M. (1979)
    This paper describes architectural considerations which led to the design of a fast programmable processor made from ECL bit-slices. The processor will be used as an on-line data filtering engine for high energy physics ...

  • 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 ...

  • A Block-Based Hough Transform Mapping for Text Line Detection in Handwritten Documents 

    Louloudis, Georgios; Gatos, B.; Pratikakis, I.; Halatsis, Constantin (2006)
    In this paper, we present a new text line detection method for unconstrained handwritten documents. The proposed technique is based on a strategy that consists of three distinct steps. The first step includes preprocessing ...

  • 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 ...

  • 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 ...

  • 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 Context-Based Adaptive Visualization Environment 

    Golemati, Maria; Halatsis, Constantin; Vassilakis, Costas; Katifori, Akrivi; Lepouras, Georgios (IEEE, 2006)
    Digital libraries and historical archives are increasingly employing visualization systems to facilitate the information retrieval and knowledge extraction tasks of their users. Typically, each organization employs a single ...

  • Creating an Historical Archive Ontology: Guidelines and Evaluation 

    Torou, Elena; Katifori, Akrivi; Vassilakis, Costas; Lepouras, Georgios; Halatsis, Constantin (IEEE Xplore, 2006)
    Ontologies have been proven invaluable tools both for the semantic web and for personal information management. In the context of a historical archive an ontology may provide meaningful and efficient support for search ...

  • Creating an Ontology for the User Profile: Method and Applications 

    Golemati, Maria; Katifori, Akrivi; Vassilakis, Costas; Lepouras, George; Halatsis, Constantin (2007)
    User profiling is commonly employed nowadays to enhance usability as well as to support personalization, adaptivity and other user-centric features. Insofar, application designers model user profiles mainly in an ad-hoc ...

  • 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 ...

  • Dynamic Process Modeling through Multi-level RBNs 

    Tsalgatidou, Aphrodite; Gouscos, Dimitris; Halatsis, Constantin (Deft University Press, 1994-09)
    This paper presents an approach for specifying and validating the dynamic aspects of IS at multiple levels of abstraction, during the requirements specification phase of system development, using a Petri net based model, ...