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Papers by Catalin Calistru
The wealth of multimedia items and their increasing complexity make data organization and search ... more The wealth of multimedia items and their increasing complexity make data organization and search essential. Without efficient storage, accurate search and informative retrieval, it is hard to explore a multimedia repository to its full potential. We argue that the problems of managing large and heterogeneous multimedia repositories can be alleviated by bringing improvements in several aspects: storage model, high-dimensional indexing, and retrieval. Three main contributions are proposed: a database model, a high-dimensional indexing method and a faceted retrieval system. The database model accounts for content organization and its association to metadata. It is a hybrid relational-XML database model. For search within the high-dimensional data, an indexing method called BitMatrix is proposed. It constructs bit signatures that can be efficiently processed with bitwise operations. Our experiments have shown that the use of the BitMatrix as a high-dimensional indexing method is beneficial for the retrieval process. Finally, a retrieval system called MetaMedia was developed, in which the proposed database model and the BitMatrix index are instantiated.
Lecture Notes in Computer Science
Page 1. Multimedia in Cultural Heritage Collections: A Model and Applications* Cristina Ribeiro1,... more Page 1. Multimedia in Cultural Heritage Collections: A Model and Applications* Cristina Ribeiro1,2, Gabriel David1,2, and Catalin Calistru1,2 ... Lew, MS, Sebe, N., Djeraba, C., Jain, R.: Content-based multimedia informa-tion retrieval: State of the art and challenges. ACM Trans. ...
Lecture Notes in Computer Science
Abstract. The web is currently the information searching and browsing environment of choice for s... more Abstract. The web is currently the information searching and browsing environment of choice for scholars and lay users alike. The goal of most cultural heritage applications is to interest a large audience, and therefore web interfaces are being developed even when part of ...
IEEE 6th Workshop on Multimedia Signal Processing, 2004.
2007 IEEE 23rd International Conference on Data Engineering Workshop, 2007
... Gabriel David Faculdade de Engenharia da Universidade do Porto/INESC-Porto Rua Dr. Roberto Fr... more ... Gabriel David Faculdade de Engenharia da Universidade do Porto/INESC-Porto Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal gtd@fe.up.pt Abstract ... ACM Comput. Surv., 36(1):3567, 2004. [23] MS Lew, N. Sebe, C. Djeraba, and R. Jain. ...
International Journal of Research Studies in Computing, 2013
EURASIP Journal on Image and Video Processing, 2009
Lecture Notes in Computer Science, 2006
Page 1. Multidimensional Descriptor Indexing: Exploring the BitMatrix* Catalin Calistru1,2, Crist... more Page 1. Multidimensional Descriptor Indexing: Exploring the BitMatrix* Catalin Calistru1,2, Cristina Ribeiro1,2, and Gabriel David1,2 ... Given a query object o and a metric function d(ox,oy), the search task accounts to finding a particular set of objects. ...
Multimedia - A Multidisciplinary Approach to Complex Issues, 2012
Lecture Notes in Computer Science, 2007
Lecture Notes in Computer Science, 2007
Abstract. The web is currently the information searching and browsing environment of choice for s... more Abstract. The web is currently the information searching and browsing environment of choice for scholars and lay users alike. The goal of most cultural heritage applications is to interest a large audience, and therefore web interfaces are being developed even when part of ...
IEEE 6th Workshop on Multimedia Signal Processing, 2004., 2004
Proceedings of International Conference on Control Applications, 1995
ABSTRACT The paper presents an approach of tuning PID controllers using the integral criteria and... more ABSTRACT The paper presents an approach of tuning PID controllers using the integral criteria and symbolic calculus facilities offered by one of the most powerful symbolic calculus packages, MATHEMATICA. The approach, called SYMBOLIC-TUNE, considers the Krasovschii-Pospelov formulae. Different controller types and different plants are considered. Illustrative results obtain by simulation are presented
Lecture Notes in Computer Science, 2006
Multimedia - A Multidisciplinary Approach to Complex Issues, 2012
2007 IEEE 23rd International Conference on Data Engineering Workshop, 2007
EURASIP Journal on Image and Video Processing, 2009
The wealth of multimedia items and their increasing complexity make data organization and search ... more The wealth of multimedia items and their increasing complexity make data organization and search essential. Without efficient storage, accurate search and informative retrieval, it is hard to explore a multimedia repository to its full potential. We argue that the problems of managing large and heterogeneous multimedia repositories can be alleviated by bringing improvements in several aspects: storage model, high-dimensional indexing, and retrieval. Three main contributions are proposed: a database model, a high-dimensional indexing method and a faceted retrieval system. The database model accounts for content organization and its association to metadata. It is a hybrid relational-XML database model. For search within the high-dimensional data, an indexing method called BitMatrix is proposed. It constructs bit signatures that can be efficiently processed with bitwise operations. Our experiments have shown that the use of the BitMatrix as a high-dimensional indexing method is beneficial for the retrieval process. Finally, a retrieval system called MetaMedia was developed, in which the proposed database model and the BitMatrix index are instantiated.
Lecture Notes in Computer Science
Page 1. Multimedia in Cultural Heritage Collections: A Model and Applications* Cristina Ribeiro1,... more Page 1. Multimedia in Cultural Heritage Collections: A Model and Applications* Cristina Ribeiro1,2, Gabriel David1,2, and Catalin Calistru1,2 ... Lew, MS, Sebe, N., Djeraba, C., Jain, R.: Content-based multimedia informa-tion retrieval: State of the art and challenges. ACM Trans. ...
Lecture Notes in Computer Science
Abstract. The web is currently the information searching and browsing environment of choice for s... more Abstract. The web is currently the information searching and browsing environment of choice for scholars and lay users alike. The goal of most cultural heritage applications is to interest a large audience, and therefore web interfaces are being developed even when part of ...
IEEE 6th Workshop on Multimedia Signal Processing, 2004.
2007 IEEE 23rd International Conference on Data Engineering Workshop, 2007
... Gabriel David Faculdade de Engenharia da Universidade do Porto/INESC-Porto Rua Dr. Roberto Fr... more ... Gabriel David Faculdade de Engenharia da Universidade do Porto/INESC-Porto Rua Dr. Roberto Frias s/n, 4200-465 Porto, Portugal gtd@fe.up.pt Abstract ... ACM Comput. Surv., 36(1):3567, 2004. [23] MS Lew, N. Sebe, C. Djeraba, and R. Jain. ...
International Journal of Research Studies in Computing, 2013
EURASIP Journal on Image and Video Processing, 2009
Lecture Notes in Computer Science, 2006
Page 1. Multidimensional Descriptor Indexing: Exploring the BitMatrix* Catalin Calistru1,2, Crist... more Page 1. Multidimensional Descriptor Indexing: Exploring the BitMatrix* Catalin Calistru1,2, Cristina Ribeiro1,2, and Gabriel David1,2 ... Given a query object o and a metric function d(ox,oy), the search task accounts to finding a particular set of objects. ...
Multimedia - A Multidisciplinary Approach to Complex Issues, 2012
Lecture Notes in Computer Science, 2007
Lecture Notes in Computer Science, 2007
Abstract. The web is currently the information searching and browsing environment of choice for s... more Abstract. The web is currently the information searching and browsing environment of choice for scholars and lay users alike. The goal of most cultural heritage applications is to interest a large audience, and therefore web interfaces are being developed even when part of ...
IEEE 6th Workshop on Multimedia Signal Processing, 2004., 2004
Proceedings of International Conference on Control Applications, 1995
ABSTRACT The paper presents an approach of tuning PID controllers using the integral criteria and... more ABSTRACT The paper presents an approach of tuning PID controllers using the integral criteria and symbolic calculus facilities offered by one of the most powerful symbolic calculus packages, MATHEMATICA. The approach, called SYMBOLIC-TUNE, considers the Krasovschii-Pospelov formulae. Different controller types and different plants are considered. Illustrative results obtain by simulation are presented
Lecture Notes in Computer Science, 2006
Multimedia - A Multidisciplinary Approach to Complex Issues, 2012
2007 IEEE 23rd International Conference on Data Engineering Workshop, 2007
EURASIP Journal on Image and Video Processing, 2009