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Your search keyword '"Perantonis, Stavros J."' showing total 46 results
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46 results on '"Perantonis, Stavros J."'

1. Recognition of Urban Sound Events Using Deep Context-Aware Feature Extractors and Handcrafted Features

Author

Giannakopoulos, Theodore, Spyrou, Evaggelos, Perantonis, Stavros J., Rannenberg, Kai, Editor-in-Chief, Sakarovitch, Jacques, Editorial Board Member, Goedicke, Michael, Editorial Board Member, Tatnall, Arthur, Editorial Board Member, Neuhold, Erich J., Editorial Board Member, Pras, Aiko, Editorial Board Member, Tröltzsch, Fredi, Editorial Board Member, Pries-Heje, Jan, Editorial Board Member, Kreps, David, Editorial Board Member, Reis, Ricardo, Editorial Board Member, Furnell, Steven, Editorial Board Member, Furbach, Ulrich, Editorial Board Member, Winckler, Marco, Editorial Board Member, Malaka, Rainer, Editorial Board Member, MacIntyre, John, editor, Maglogiannis, Ilias, editor, Iliadis, Lazaros, editor, and Pimenidis, Elias, editor

Published
2019
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7. A Holistic Methodology for Keyword Search in Historical Typewritten Documents

Author

Gatos, Basilis, Konidaris, Thomas, Pratikakis, Ioannis, Perantonis, Stavros J., Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Dough, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Antoniou, Grigoris, editor, Potamias, George, editor, Spyropoulos, Costas, editor, and Plexousakis, Dimitris, editor

Published
2006
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8. Automatic Table Detection in Document Images

Author

Gatos, Basilios, Danatsas, Dimitrios, Pratikakis, Ioannis, Perantonis, Stavros J., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Singh, Sameer, editor, Singh, Maneesha, editor, Apte, Chid, editor, and Perner, Petra, editor

Published
2005
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9. ENORASI Assistive Computer Vision-based System for the Visually Impaired: A User Evaluation Study

Author

Mitsou, Alexandros, primary, Koutsiou, Dimitra-Christina C., additional, Diamantis, Dimitrios E., additional, Psallidas, Theodoros, additional, Dimas, George, additional, Vasilakakis, Michael, additional, Kalozoumis, Panagiotis, additional, Spyrou, Evaggelos, additional, Perantonis, Stavros J., additional, Krukowski, Artur, additional, and Iakovidis, Dimitris K., additional

Published
2022
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10. A Segmentation-Free Recognition Technique to Assist Old Greek Handwritten Manuscript OCR

Author

Gatos, Basilios, Ntzios, Kostas, Pratikakis, Ioannis, Petridis, Sergios, Konidaris, T., Perantonis, Stavros J., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Marinai, Simone, editor, and Dengel, Andreas R., editor

Published
2004
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11. An Adaptive Binarization Technique for Low Quality Historical Documents

Author

Gatos, Basilios, Pratikakis, Ioannis, Perantonis, Stavros J., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Marinai, Simone, editor, and Dengel, Andreas R., editor

Published
2004
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12. Locating Text in Historical Collection Manuscripts

Author

Gatos, Basilios, Pratikakis, Ioannis, Perantonis, Stavros J., Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Vouros, George A., editor, and Panayiotopoulos, Themistoklis, editor

Published
2004
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13. Feature Deforming for Improved Similarity-Based Learning

Author

Petridis, Sergios, Perantonis, Stavros J., Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Vouros, George A., editor, and Panayiotopoulos, Themistoklis, editor

Published
2004
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14. Text Area Identification in Web Images

Author

Perantonis, Stavros J., Gatos, Basilios, Maragos, Vassilios, Karkaletsis, Vangelis, Petasis, George, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Carbonell, Jaime G., editor, Siekmann, Jörg, editor, Vouros, George A., editor, and Panayiotopoulos, Themistoklis, editor

Published
2004
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20. Two highly efficient second-order algorithms for training feedforward networks

Author

Ampazis, Nikolaos and Perantonis, Stavros J.

Subjects
Electrical engineering -- Research, Neural networks -- Research, Fuzzy logic -- Usage, Least squares -- Usage, Machine learning -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

In this paper, we present two highly efficient second-order algorithms for the training of multilayer feedforward neural networks. The algorithms are based on iterations of the form employed in the Levenberg-Marquardt (LM) method for nonlinear least squares problems with the inclusion of an additional adaptive momentum term arising from the formulation of the training task as a constrained optimization problem. Their implementation requires minimal additional computations compared to a standard LM iteration which are compensated, however, from their excellent convergence properties. Simulations to large scale classical neural-network benchmarks are presented which reveal the power of the two methods to obtain solutions in difficult problems, whereas other standard second-order techniques (including LM) fail to converge. Index Terms--Algorithms, multilayer feedforward neural networks, nonlinear least-squares, optimization, supervised learning.

Published
2002

41. On the use of spatial relations between objects for image classification.

Author

Boukis, Christos, Pnevmatikakis, Aristodemos, Polymenakos, Lazaros, Tsapatsoulis, Nicolas, Petridis, Sergios, and Perantonis, Stavros J.

Abstract

Image classification is addressed in this paper by utilizing spatial relation of detected objects in a rule-based fashion. Instances of particular object classes are detected combining bottom-up (learn-able models based on simple features) and top-down information(object models consisting of primitive geometric shapes such as lines). The rule-based system acts as a model for the spatial configuration of objects, also providing a human interpretable justification of image classification. Experimental results in the athletic domain show that despite inefficiencies in object detection, spatial relations allow for efficient discrimination between visually similar images classes. [ABSTRACT FROM AUTHOR]

Published
2007
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42. A Holistic Methodology for Keyword Search in Historical Typewritten Documents.

Author

Antoniou, Grigoris, Potamias, George, Spyropoulos, Costas, Plexousakis, Dimitris, Gatos, Basilis, Konidaris, Thomas, Pratikakis, Ioannis, and Perantonis, Stavros J.

Abstract

In this paper, we propose a novel holistic methodology for keyword search in historical typewritten documents combining synthetic data and user's feedback. The holistic approach treats the word as a single entity and entails the recognition of the whole word rather than of individual characters. Our aim is to search for keywords typed by the user in a large collection of digitized typewritten historical documents. The proposed method is based on: (i) creation of synthetic image words; (ii) word segmentation using dynamic parameters; (iii) efficient hybrid feature extraction for each image word and (iv) a retrieval procedure that is optimized by user's feedback. Experimental results prove the efficiency of the proposed approach. [ABSTRACT FROM AUTHOR]

Published
2006
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43. Automatic Table Detection in Document Images.

Author

Singh, Sameer, Singh, Maneesha, Apte, Chid, Perner, Petra, Gatos, Basilios, Danatsas, Dimitrios, Pratikakis, Ioannis, and Perantonis, Stavros J.

Abstract

In this paper, we propose a novel technique for automatic table detection in document images. Lines and tables are among the most frequent graphic, non-textual entities in documents and their detection is directly related to the OCR performance as well as to the document layout description. We propose a workflow for table detection that comprises three distinct steps: (i) image pre-processing; (ii) horizontal and vertical line detection and (iii) table detection. The efficiency of the proposed method is demonstrated by using a performance evaluation scheme which considers a great variety of documents such as forms, newspapers/magazines, scientific journals, tickets/bank cheques, certificates and handwritten documents. [ABSTRACT FROM AUTHOR]

Published
2005
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