... airplane. Nevertheless, although VOs and their functionalities are analytically described by ... more ... airplane. Nevertheless, although VOs and their functionalities are analytically described by the MPEG-4 standard, techniques to generate them are left to content developers. ... content. For this reason a shot cut detection algorithm is applied. ...
Natural Language Processing for Knowledge Integration, 2009
In this chapter, a non-linear relevance feedback mechanism is proposed for increasing the perform... more In this chapter, a non-linear relevance feedback mechanism is proposed for increasing the performance and the reliability of information (medical content) retrieval systems. In greater detail, the user who searches for information is considered to be part of the retrieval ...
Proceedings of the 4th ACM/IEEE international workshop on Analysis and retrieval of tracked events and motion in imagery stream - ARTEMIS '13, 2013
ABSTRACT Nowadays, there are available extremely large collections of images located on distribut... more ABSTRACT Nowadays, there are available extremely large collections of images located on distributed and heterogeneous platforms over the web. The proliferation of billions of shared photos has outpaced the current technology for browsing such collections, but at the same time it spurred the emergence of new image retrieval techniques based not only on photos' visual information, but on geo-location tags and camera exif data. Although, additional image information may be proven very useful for preliminary image retrieval, the final retrieved result is necessary to be refined by exploiting visual information. In this paper we present a process for refining image retrieval results by exploiting and fusing two unsupervised clustering techniques: DBSCAN and spectral clustering. DBSCAN algorithm is used to remove outliers from the initially retrieved image set, and spectral clustering finalizes retrieval process by clustering together visually similar images. However, DBSCAN and spectral clustering require manual tunning of their parameters, which usually requires a priori knowledge of the dataset. To overcome this problem we developed a tuning mechanism that automatically tunes the parameters of both algorithms. For the evaluation of the proposed approach we used thousands of images from Flickr downloaded using text queries for well known cultural heritage monuments.
2013 IEEE 10th International Conference on e-Business Engineering, 2013
ABSTRACT The Biopolis takes a radical approach to the long term preservation of digital user cont... more ABSTRACT The Biopolis takes a radical approach to the long term preservation of digital user content. The system will allow Biopolis enriched User Content to be distributed and redistributed through a network of commercial and non-commercial file (Preservation Services), while ensuring a lasting relationship, between the holder and the owner of the intellectual content. Based on web and mobile technologies and using a cloud based storage system will allow the end user to maintain the time and geolocation parameter on its digital content, providing new advanced business models for e-business end users.
2013 14th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS), 2013
ABSTRACT This paper presents a vision-based system for maritime surveillance using moving PTZ cam... more ABSTRACT This paper presents a vision-based system for maritime surveillance using moving PTZ cameras. This system is intended to be used as an early warning system by local authorities. It fuses a visual attention method that exploits low-level image features appropriately selected for maritime environment, with an online adaptable neural network tracker, without making any assumptions about environmental or visual conditions. Systems performance was evaluated with videos from cameras placed at Limassol port and Venetian port of Chania and concerns robustness compared to dynamically changing visual conditions and different kinds of vessels, all in real time.
Proceeding of the 16th ACM international conference on Multimedia - MM '08, 2008
... Technical University of Crete, Greece Luc van Gool, Eidgenoessische Technische Hochschule Z... more ... Technical University of Crete, Greece Luc van Gool, Eidgenoessische Technische Hochschule Zuerich, Switzerland Mak Nixon, University of ... Austria Matthew Addis, IT Innovation Labs, United Kingdom Emmanuel Sardis, Aegean University, Greece Ignacio Soler, ATOS ...
2012 13th International Workshop on Image Analysis for Multimedia Interactive Services, 2012
ABSTRACT This article presents a robust, real-time background subtraction algorithm able to opera... more ABSTRACT This article presents a robust, real-time background subtraction algorithm able to operate properly in complex dynamically changing visual conditions and indoor/outdoor environments, based on a single, cheap monocular camera, like a webcam. This algorithm uses an image grid and models each pixel of the grid as a mixture of adaptive Student-t distributions. This approach makes this algorithm robust and efficient, in terms of computational cost and memory requirements, and thus suitable for large scale implementations. The proposed algorithm is applied in the problem of humans' fall detection that presents high complexity of visual content. Finally, the performances of this scheme and the scheme proposed in [1] by the same authors, are compared.
International Journal of Machine Learning and Computing, 2011
ABSTRACT Production lines need fast technologies for critical online decisions. Orchestration of ... more ABSTRACT Production lines need fast technologies for critical online decisions. Orchestration of different signals and processes from a number of different sensors around the industry, into related workflows are the key signals on workflows tasks recognition. The advantages of sensor networks’ technologies outputs, that their outputs are controlled by multi agents systems, in order to orchestrate and execute related production workflows, is the main point of this research work. In specific, the aim of this manuscript is to present a system that manipulates and controls these workflows executions. System architecture and sub modules are presented in more detail through the manuscript, plus a production scenario implementation.
Proceeding of the 1st ACM workshop on Analysis and retrieval of events/actions and workflows in video streams - AREA '08, 2008
... 210 772 1511 sardis@aegean.gr Theodora Varvarigou National Technical University of Athens 9, ... more ... 210 772 1511 sardis@aegean.gr Theodora Varvarigou National Technical University of Athens 9, Heroon Polytechniou 157 73 Zografou, Athens Tel: + 30 210 772 2484 dora@telecom.ntua.gr ABSTRACT In this paper, we propose ...
2008 IEEE International Engineering Management Conference, 2008
ABSTRACT Market simulators assist managers in product design and pricing decisions, through advan... more ABSTRACT Market simulators assist managers in product design and pricing decisions, through advanced heuristic algorithms for consumer buying behavior modeling. We propose a model for use in such systems, which combines the effective incorporation of the two critical properties a simulator should theoretically reflects, with exceptionally performance in actual choice shares estimation. Differential Impact and Substitution are exhibited through the representation of customer heterogeneity and product similarity in the choice rule, while high predictive accuracy is displayed with the implementation of the Stochastic Logarithmic Search algorithm.
... airplane. Nevertheless, although VOs and their functionalities are analytically described by ... more ... airplane. Nevertheless, although VOs and their functionalities are analytically described by the MPEG-4 standard, techniques to generate them are left to content developers. ... content. For this reason a shot cut detection algorithm is applied. ...
Natural Language Processing for Knowledge Integration, 2009
In this chapter, a non-linear relevance feedback mechanism is proposed for increasing the perform... more In this chapter, a non-linear relevance feedback mechanism is proposed for increasing the performance and the reliability of information (medical content) retrieval systems. In greater detail, the user who searches for information is considered to be part of the retrieval ...
Proceedings of the 4th ACM/IEEE international workshop on Analysis and retrieval of tracked events and motion in imagery stream - ARTEMIS '13, 2013
ABSTRACT Nowadays, there are available extremely large collections of images located on distribut... more ABSTRACT Nowadays, there are available extremely large collections of images located on distributed and heterogeneous platforms over the web. The proliferation of billions of shared photos has outpaced the current technology for browsing such collections, but at the same time it spurred the emergence of new image retrieval techniques based not only on photos' visual information, but on geo-location tags and camera exif data. Although, additional image information may be proven very useful for preliminary image retrieval, the final retrieved result is necessary to be refined by exploiting visual information. In this paper we present a process for refining image retrieval results by exploiting and fusing two unsupervised clustering techniques: DBSCAN and spectral clustering. DBSCAN algorithm is used to remove outliers from the initially retrieved image set, and spectral clustering finalizes retrieval process by clustering together visually similar images. However, DBSCAN and spectral clustering require manual tunning of their parameters, which usually requires a priori knowledge of the dataset. To overcome this problem we developed a tuning mechanism that automatically tunes the parameters of both algorithms. For the evaluation of the proposed approach we used thousands of images from Flickr downloaded using text queries for well known cultural heritage monuments.
2013 IEEE 10th International Conference on e-Business Engineering, 2013
ABSTRACT The Biopolis takes a radical approach to the long term preservation of digital user cont... more ABSTRACT The Biopolis takes a radical approach to the long term preservation of digital user content. The system will allow Biopolis enriched User Content to be distributed and redistributed through a network of commercial and non-commercial file (Preservation Services), while ensuring a lasting relationship, between the holder and the owner of the intellectual content. Based on web and mobile technologies and using a cloud based storage system will allow the end user to maintain the time and geolocation parameter on its digital content, providing new advanced business models for e-business end users.
2013 14th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS), 2013
ABSTRACT This paper presents a vision-based system for maritime surveillance using moving PTZ cam... more ABSTRACT This paper presents a vision-based system for maritime surveillance using moving PTZ cameras. This system is intended to be used as an early warning system by local authorities. It fuses a visual attention method that exploits low-level image features appropriately selected for maritime environment, with an online adaptable neural network tracker, without making any assumptions about environmental or visual conditions. Systems performance was evaluated with videos from cameras placed at Limassol port and Venetian port of Chania and concerns robustness compared to dynamically changing visual conditions and different kinds of vessels, all in real time.
Proceeding of the 16th ACM international conference on Multimedia - MM '08, 2008
... Technical University of Crete, Greece Luc van Gool, Eidgenoessische Technische Hochschule Z... more ... Technical University of Crete, Greece Luc van Gool, Eidgenoessische Technische Hochschule Zuerich, Switzerland Mak Nixon, University of ... Austria Matthew Addis, IT Innovation Labs, United Kingdom Emmanuel Sardis, Aegean University, Greece Ignacio Soler, ATOS ...
2012 13th International Workshop on Image Analysis for Multimedia Interactive Services, 2012
ABSTRACT This article presents a robust, real-time background subtraction algorithm able to opera... more ABSTRACT This article presents a robust, real-time background subtraction algorithm able to operate properly in complex dynamically changing visual conditions and indoor/outdoor environments, based on a single, cheap monocular camera, like a webcam. This algorithm uses an image grid and models each pixel of the grid as a mixture of adaptive Student-t distributions. This approach makes this algorithm robust and efficient, in terms of computational cost and memory requirements, and thus suitable for large scale implementations. The proposed algorithm is applied in the problem of humans' fall detection that presents high complexity of visual content. Finally, the performances of this scheme and the scheme proposed in [1] by the same authors, are compared.
International Journal of Machine Learning and Computing, 2011
ABSTRACT Production lines need fast technologies for critical online decisions. Orchestration of ... more ABSTRACT Production lines need fast technologies for critical online decisions. Orchestration of different signals and processes from a number of different sensors around the industry, into related workflows are the key signals on workflows tasks recognition. The advantages of sensor networks’ technologies outputs, that their outputs are controlled by multi agents systems, in order to orchestrate and execute related production workflows, is the main point of this research work. In specific, the aim of this manuscript is to present a system that manipulates and controls these workflows executions. System architecture and sub modules are presented in more detail through the manuscript, plus a production scenario implementation.
Proceeding of the 1st ACM workshop on Analysis and retrieval of events/actions and workflows in video streams - AREA '08, 2008
... 210 772 1511 sardis@aegean.gr Theodora Varvarigou National Technical University of Athens 9, ... more ... 210 772 1511 sardis@aegean.gr Theodora Varvarigou National Technical University of Athens 9, Heroon Polytechniou 157 73 Zografou, Athens Tel: + 30 210 772 2484 dora@telecom.ntua.gr ABSTRACT In this paper, we propose ...
2008 IEEE International Engineering Management Conference, 2008
ABSTRACT Market simulators assist managers in product design and pricing decisions, through advan... more ABSTRACT Market simulators assist managers in product design and pricing decisions, through advanced heuristic algorithms for consumer buying behavior modeling. We propose a model for use in such systems, which combines the effective incorporation of the two critical properties a simulator should theoretically reflects, with exceptionally performance in actual choice shares estimation. Differential Impact and Substitution are exhibited through the representation of customer heterogeneity and product similarity in the choice rule, while high predictive accuracy is displayed with the implementation of the Stochastic Logarithmic Search algorithm.
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