Browsing Conference papers by Author "Chatzichristofis, Savvas A."
Now showing items 21-35 of 35
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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The NOPTILUS project overview: A fully-autonomous navigation system of teams of AUVs for static/dynamic underwater map construction
Kapoutsis, A. Ch.; Salavasidis, G. V.; Chatzichristofis, Savvas A.; Braga, J.; Pinto, J.; Borges de Sousa, Joao; Kosmatopoulos, E. B. (IFAC (International Federation of Automatic Control), 2015)Within the project NOPTILUS, a fully functional system/methodology had been developed that allows the cooperative, fully-autonomous navigation of teams of AUVs when deployed in Static or Dynamic Underwater Map Construction ...
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ParkChain: An IoT Parking Service Based on Blockchain
Zinonos, Zinon; Christodoulou, Panayiotis; Andreou, Andreas; Chatzichristofis, Savvas A. (IEEE, 2019-08-19)The IoT ecosystem is evolving quickly, developing several applications in different sectors. The majority of these applications use centralized infrastructures something that poses several challenges especially related to ...
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Performance Study of the Most Commonly Used Image Retrieval Evaluation Methods
Chatzichristofis, Savvas A.; Boutalis, Yiannis (ACTA PRESS, 2010)One of the most significant problems in the field of image retrieval results from the lack of a common test bed for the evaluation of the systems. So far, many of the methods used in the field of information retrieval ...
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Selection of the Proper Compact Composite Descriptor for Improving Content based Image Retrieval
Chatzichristofis, Savvas A.; Boutalis, Yiannis; Lux, Mathias (ACTA Press, Canada, 2009)Compact Composite Descriptors (CCD) are global image features capturing both, color and texture characteristics, at the same time in a very compact representation. In this paper we propose a combination of two recently ...
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SFly: Swarm of Micro Flying Robots
Achtelik, Markus; Achtelik, Michael; Brunet, Yorick; Chli, Margarita; Chatzichristofis, Savvas A. (IEEE (Computer Society), 2012)The SFly project is an EU-funded project, with the goal to create a swarm of autonomous vision controlled micro aerial vehicles. The mission in mind is that a swarm of MAV’s autonomously maps out an unknown environmen ...
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SPCD - SPATIAL COLOR DISTRIBUTION DESCRIPTOR - A Fuzzy Rule based Compact Composite Descriptor Appropriate for Hand Drawn Color Sketches Retrieval
Chatzichristofis, Savvas A.; Boutalis, Yiannis; Lux, Mathias (SCITEPRESS, 2010)In this paper, a new low level feature suitable for Hand Drawn Color Sketches retrieval is presented. The proposed feature structure combines color and spatial color distribution information. The combination of these two ...
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The TREC files: the (ground) truth is out there
Chatzichristofis, Savvas A.; Zagoris, Konstantinos; Arampatzis, Avi (Association for Computing Machinery (ACM), United States, 2011)Traditional tools for information retrieval (IR) evaluation, such as TREC’s trec_eval, have outdated command-line interfaces with many unused features, or ‘switches’, accumulated over the years. They are usually seen ...
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Two-Staged Image Colorization Based on Salient Contours
Anagnostopoulos, Nektarios; Iakovidou, Chrysanthi; Amanatiadis, A.; Boutalis, Yiannis; Chatzichristofis, Savvas A. (IEEE (Computer Society), 2014)In this paper we present a novel colorization technique that manages to significantly reduce color bleeding artifacts caused by weak object boundaries and also requires only abstract color indications and placement from ...
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www.MMRetrieval.net: a multimodal search engine
Zagoris, Konstantinos; Chatzichristofis, Savvas A.; Arampatzis, Avi (Association for Computing Machinery (ACM), United States, 2010)We introduce an experimental search engine for multilin- gual and multimedia information, employing a holistic web interface and enabling the use of highly distributed indices. Modalities are searched in parallel, and ...