CiteSeerX — Author Search Results — "Constantine Kotropoulos"

Linear Projection Algorithms and Morphological Dynamic Link Architecture for Frontal Face Verification
by Constantine Kotropoulos, Ioannis Pitas — 1998 — in European Signal Processing Conference
…The combined use of linear projection algorithms with a variant of dynamic link architecture based on the multiscale morphological dilation-erosion is proposed for face verification. The performance of the combined scheme is evaluated in terms of the receiver operating characteristic (ROC) for sever…
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Face Authentication Using Variants Of Elastic Graph Matching Based On Mathematical Morphology That Incorporate Local Discriminant Coefficients
by C. Kotropoulos, Constantine Kotropoulos, I. Pitas, A. Tefas, Ioannis Pitas — in 1998 IEEE Int. Conf. on Acoustics, Speech and Signal Processing
…Two novel variants of Dynamic Link Architecture that are based on mathematical morphology and incorporate local coefficients which weigh the contribution of each node according to its discriminatory power in elastic graph matching are proposed, namely, the Morphological Dynamic Link Architecture and…
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Rule-Based Face Detection in Frontal Views
by Constantine Kotropoulos, Ioannis Pitas — 1997 — in Proc. of IEEE Int. Conf. on Acoustics, Speech and Signal Processing (ICASSP 97), vol. IV
…Face detection is a key problem in building automated systems that perform face recognition. A very attractive approach for face detection is based on multiresolution images (also known as mosaic images). Motivated by the simplicity of this approach, a rule-based face detection algorithm in frontal …
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Eigenvalue Distribution Of The Correlation Matrix In
by Filters Constantine Kotropoulos, Constantine Kotropoulos, Ioannis Pitas
…L`-filters are a fundamental filter class within the family of order statistic filters. In this paper, starting from first principles, we derive the cumulative density function and the probability density function of time and ranked ordered samples for independent identically/non-identically distrib…
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APPLYING SUPERVISED CLASSIFIERS BASED ON NON-NEGATIVE MATRIX FACTORIZATION TO MUSICAL INSTRUMENT CLASSIFICATION
by Emmanouil Benetos, Margarita Kotti, Constantine Kotropoulos
…In this paper, a new approach for automatic audio classification using non-negative matrix factorization (NMF) is presented. Training is performed onto each audio class individually, whilst during the test phase each test recording is projected onto the several training matrices. Experiments demonst…
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A New Fuzzy C-Means Based Segmentation Strategy. Applications To Lip Region Identification
by Mihaela Gordan, Constantine Kotropoulos, Apostolos Georgakis, Ioannis Pitas — 2002 — IEEE-TTTC International Conference on Automation, Quality and Testing, Robotics
…The problem of lip contour detection is critical in the lipreading systems based on contour processing. The typical contour detection strategy based on image segmentation in homogeneous regions fails in the case when the mouth images available for lipreading are lowcontrast gray level images. Most o…
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Face Authentication By Using Elastic Graph Matching And Support Vector Machines
by Anastasios Tefas, Constantine Kotropoulos, Ioannis Pitas — Proc. International Conf. Acoustics, Speech and Signal Processing
…In this paper, a novel method for enhancing the performance of elastic graph matching in face authentication is proposed. The starting point is to weigh the local matching errors at the nodes of an elastic graph according to their discriminatory power. We propose a novel approach to discriminant ana…
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Face Authentication using Morphological Dynamic Link Architecture
by Constantine Kotropoulos, Ioannis Pitas, Stefan Fischer, Benoît Duc — 1997 — In Proceedings of the First International Conference on Audio- and Video-based Biometric Person Authentication (AVBPA'97), Lecture Notes in Computer Science
…. A very attractive approach for face detection is based on multiresolution images (also known as mosaic images). Motivated by the simplicity of this approach, a rule-based face detection algorithm in frontal views is developed first. Second, a novel dynamic link architecture based on multiscale mor…
Cited by 8 (2 self) – Add To MetaCart

Enhancing The Performance Of Elastic Graph Matching For Face Authentication By Using Support Vector Machines
by Anastasios Tefas Constantine, Constantine Kotropoulos, Ioannis Pitas — 1999 — IEEE Trans. on Pattern Analysis and Machine Intelligence
…In this paper, a novel method for enhancing the performance of elastic graph matching in face authentication is proposed.The starting point is to weigh the local matching errors at the nodes of an elastic graph according to their discriminatory power. We propose a novel approach to discriminant anal…
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On the Theoretical Properties of
by Mean Comparators Constantine, Constantine Kotropoulos, Ioannis Pitas
…Digital implementations of sorting networks that rely on a Digital Signal Processor core are not as efficient as their analog counterparts. This paper deals with the L p comparators for which simple analog implementations exist. From a statistical point of view, the L p comparators are based on the…
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