Searching for authors named "Georgios Tziritas" – sorted by Relevance.

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12 documents found, showing 1 through 10. Next 10 →

Image Retrieval by Colour and Texture Using Chromaticity Histograms and Wavelet Frames
by Spyros Liapis, Georgios Tziritas
…In this paper the combination of texture and colour features is used for image classification. Texture features are extracted using the Discrete Wavelet Frame analysis. 2-D or 1-D histograms of the CIE Lab chromaticity coordinates are used as colour features. The 1-D histograms of the a# b coordin…
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Optimal projection of 2-D displacements for 3-D translational motion estimation
by Christophe Garcia, Georgios Tziritas
…Recovering 3-D motion parameters from 2-D displacements is a difficult task, given the influence of noise contained in these data, which correspond at best to a crude approximation of the real motion field. Stability for the system of equations to solve is therefore essential. In this paper, we pres…
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Construction of animal models and motion synthesis in 3D virtual environments using image sequences
by Costas Panagiotakis, Georgios Tziritas — 2004 — in: Proceedings of the Second International Symposium on 3DPVT (3DPVT
…In this paper, we describe a system that can build 3D animal models and synthesize animations in 3D virtual environments. The model is constructed by 2D images captured by specific views. The animation is synthesised by using physical motion models of the animal and tracking data from image sequence…
Cited by 2 (2 self) – Add To MetaCart

Face Detection Using Quantized Skin Color Regions Merging and Wavelet Packet Analysis
by Christophe Garcia, Georgios Tziritas — 1999
…Detecting and recognizing human faces automatically in digital images strongly enhance content-based video indexing systems. In this paper, a novel scheme for human faces detection in color images under nonconstrained scene conditions, such as the presence of a complex background and uncontrolled il…
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approximately optimal solutions for single and dynamic mrfs
by Nikos Komodakis, Georgios Tziritas — 2007 — In: Computer Vision and Pattern Recognition
…A new efficient MRF optimization algorithm, called Fast-PD, is proposed, which generalizes α-expansion. One of its main advantages is that it offers a substantial speedup over that method, e.g. it can be at least 3-9 times faster than α-expansion. Its efficiency is a result of the fact that Fast-PD …
Cited by 3 (1 self) – Add To MetaCart

Approximate labeling via graph-cuts based on linear programming
by Nikos Komodakis, Georgios Tziritas — 2007 — In Pattern Analysis and Machine Intelligence
…A new framework is presented for both understanding and developing graph-cut based combinatorial algorithms suitable for the approximate optimization of a very wide class of MRFs that are frequently encountered in computer vision. The proposed framework utilizes tools from the duality theory of line…
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EURASIP Journal on Applied Signal Processing 2002:4, 379–388 c ○ 2002 Hindawi Publishing Corporation Video Segmentation Using Fast Marching and Region Growing Algorithms
by Eftychis Sifakis, Ilias Grinias, Georgios Tziritas — 2001
…in the case of a moving camera, parametric motion estimation, (2) change detection having as reference a fixed frame, an appropriately selected frame or a displaced frame, and (3) object localization using local colour features. The image sequence classification is based on statistical tests on the …
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Bayesian level sets for image segmentation
by Eftichis Sifakis, Christophe Garcia, Georgios Tziritas — 2002 — Journal of Visual Communication and Image Representation
…This paper presents a new general framework for image segmentation. A level set formulation is used to model the boundaries of the image regions and a new Multilabel Fast Marching is introduced for the evolution of the region contours toward the segmentation result. Statistical tests are performed t…
Cited by 11 (7 self) – Add To MetaCart

Shape-motion based athlete tracking for multilevel action recognition
by Costas Panagiotakis, Emmanuel Ramasso, Georgios Tziritas, Michèle Rombaut, Denis Pellerin — 2006 — Proc. of the 4th Int. Conf. on Articulated Motion and Deformable Objects
…Abstract. An automatic human shape-motion analysis method based on a fusion architecture is proposed for human action recognition in videos. Robust shape-motion features are extracted from human points detection and tracking. The features are combined within the Transferable Belief Model (TBM) frame…
Cited by 1 (1 self) – Add To MetaCart

Robust Object Boundary Determination Using A Locally Adaptive Level Set Algorithm
by Eftychios Sifakis, Georgios Tziritas, Student Member Ieee — 2003
…This paper introduces a level set methodology for the precise boundary localization of image objects within an indicated region, designed to be particularly robust against weak or spurious edges, triple points or inhomogeneity of object features in the proximity of the actual interface. The proposed…
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