Browsing Conference papers by Title

Now showing items 8-27 of 40

  • 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 ...

  • 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 Topology Control for WSNs in Critical Environments 

    Zinonos, Zinon; Vassiliou, Vasos; Ioannou, Christiana; Koutroullos, Marios (IEEE, 2011)
    Plant automation and control are mission-critical applications and require timely and reliable data delivery, which is difficult to provide using a wireless technology. This is especially more difficult in industrial ...

  • Dynamic Two-Stage Image Retrieval from Large Multimodal Databases 

    Arampatzis, Avi; Zagoris, Konstantinos; Chatzichristofis, Savvas A. (Springer-Verlag, 2011)
    Content-based image retrieval (CBIR) with global features is notoriously noisy, especially for image queries with low percentages of relevant images in a collection. Moreover, CBIR typically ranks the whole collection, ...

  • FCTH: Fuzzy color and texture histogram. A low level feature for accurate image retrieval 

    Chatzichristofis, Savvas A.; Boutalis, Yiannis (IEEE (Institute of Electrical and Electronics Engineers , United States), 2008)
    This paper deals with the extraction of a new low level feature that combines, in one histogram, color and texture information. This feature is named FCTH - Fuzzy Color and Texture Histogram - and results from the combination ...

  • Fusion vs. Two-Stage for Multimodal Retrieval 

    Arampatzis, Avi; Zagoris, Konstantinos; Chatzichristofis, Savvas A. (Springer, 2011)
    We compare two methods for retrieval from multimodal collections. The first is a score-based fusion of results, retrieved visually and textually. The second is a two-stage method that visually re-ranks the top-K results ...

  • Generalized setting equations for the memory elements of sequential machines. Self-independence criteria. 

    Philokyprou, G.; Gaitanis, N. (Informatica, 1976)
    This paper is concerned with formal derivation of generalized setting (excitation) equations of the flip-flop memory elements of a sequential machine. The equations are expressed in terms of four normalized transition ...

  • Golden Retriever - A Java Based Open Source Image Retrieval Engine 

    Tsochatzidis, Lazaros T.; Iakovidou, Chrysanthi; Chatzichristofis, Savvas A.; Boutalis, Yiannis (ACM, 2013)
    Golden Retriever Image Retrieval Engine (GRire) is an open source light weight Java library developed for Content Based Image Retrieval (CBIR) tasks, employing the Bag of Visual Words (BOVW) model. It provides a complete ...

  • Hybrid scheme for fast and accurate image retrieval based on color descriptors 

    Chatzichristofis, Savvas A.; Boutalis, Yiannis (ACTA Press, Canada, 2007)
    This paper proposes a new image retrieval system, thatuses only color features and it's based on a hybrid scheme which combines crisp and fuzzy techniques, in order to retrieve color based similar images. The system ...

  • Identification and Retrieval of DNA Genomes Using Binary Image Representations Produced by Cellular Automata 

    Konstantinidis, K.; Amanatiadis, A.; Chatzichristofis, Savvas A.; Sandaltzopoulos, R.; Sirakoulis, G. Ch. (IEEE (Computer Society), 2014)
    We have developed a novel method for the identification and retrieval of DNA sequences which are represented as binary images. This type of representation emanates from the evolution of one-dimensional nucleotide arrays ...

  • img(Anaktisi): A Web Content Based Image Retrieval System 

    Zagoris, Konstantinos; Chatzichristofis, Savvas A. (IEEE, 2009)
    img(Anaktisi) is a C#/.NET content base image retrieval application suitable for the web. It provides efficient retrieval services for various image databases using as a query a sample image, an image sketched by the ...

  • Img(Rummager): An Interactive Content Based Image Retrieval System 

    Chatzichristofis, Savvas A.; Boutalis, Yiannis; Lux, Mathias (IEEE (Institute of Electrical and Electronics Engineers , United States), 2009)
    This paper presents an image retrieval suite called img(Rummager) which brings into effect a number of new as well as state of the art descriptors. The application can execute an image search based on a query image, either ...

  • Inter-Mobility Support in Controlled 6LoWPAN Networks 

    Zinonos, Zinon; Vassiliou, Vasos (IEEE, 2011)
    The research and industrial community started to think of more complex application scenarios for wireless sensor networks, where the use of mobile sensor nodes is essential. The support of mobile sensor nodes in such ...

  • Late fusion of compact composite descriptors for retrieval from heterogeneous image databases 

    Chatzichristofis, Savvas A.; Arampatzis, Avi (Association for Computing Machinery (ACM), United States, 2010)
    Compact composite descriptors (CCDs) are global image features, capturing more than one types of information at the same time in a very compact representation. Their quality has so far been evaluated in retrieval from ...

  • LIRe: Lucene Image Retrieval - An Extensible Java CBIR Library 

    Lux, Mathias; Chatzichristofis, Savvas A. (Association for Computing Machinery (ACM), United States, 2008)
    LIRe (Lucene Image Retrieval) is a light weight open source Java library for content based image retrieval. It provides common and state of the art global image features and offers means for indexing and retrieval. Due ...

  • Localized Global Descriptors for Image Retrieval: An Extensive Evaluation on Adaptations to the Simple Model 

    Anagnostopoulos, Nektarios; Iakovidou, Chrysanthi; Chatzichristofis, Savvas A.; Boutalis, Yiannis; Lux, Mathias (IEEE (Computer Society), 2016)
    SIMPLE (Searching Images with MPEG-7 (& MPEG-7-like) Powered Localized dEscriptors) is a model that proposes the reuse of well-established global descriptors by localizing their description mechanism on image patches located ...

  • Mobility in WSNs for Critical Applications 

    Silva, Ricardo; Zinonos, Zinon; Sá Silva, Jorge; Vassiliou, Vasos (IEEE, 2011)
    Recent critical application sectors of sensor networks like military, health care, and industry require the use of mobile sensor nodes, something that poses unique challenges in aspects like handoff delay, packet loss, and ...

  • Multimedia Search with Noisy Modalities: Fusion and Multistage Retrieval 

    Arampatzis, Avi; Chatzichristofis, Savvas A.; Zagoris, Konstantinos (ImageClef, Wikipedia Retrieval Task, 2010)
    We report our experiences from participating to the controlled experiment of the ImageCLEF 2010 Wikipedia Retrieval task. We built an experimental search engine which combines multilingual and multi-image search, employing ...