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Displaying 1-11 out of 11 total
SHREC'08 entry: 2D/3D hybrid
Found in: Shape Modeling and Applications, International Conference on
By Panagiotis Papadakis, Ioannis Pratikakis, Stavros Perantonis, Theoharis Theoharis, Georgios Passalis
Issue Date:June 2008
pp. 247-248
In this paper, we present an overview of the 3D object retrieval method that we employed in our participation to the Generic Models track of SHREC 2008 organized by the AIM@SHAPE network of excellence. The proposed methodology is detailed in [2]. Our metho...
Three-Dimensional Face Recognition in the Presence of Facial Expressions: An Annotated Deformable Model Approach
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By Ioannis A. Kakadiaris, Georgios Passalis, George Toderici, Mohammed N. Murtuza, Yunliang Lu, Nikos Karampatziakis, Theoharis Theoharis
Issue Date:April 2007
pp. 640-649
In this paper, we present the computational tools and a hardware prototype for 3D face recognition. Full automation is provided through the use of advanced multistage alignment algorithms, resilience to facial expressions by employing a deformable model fr...
Reconstruction of Three-Dimensional Objects through Matching of Their Parts
Found in: IEEE Transactions on Pattern Analysis and Machine Intelligence
By Georgios Papaioannou, Evaggelia-Aggeliki Karabassi, Theoharis Theoharis
Issue Date:January 2002
pp. 114-124
<p>The problem of reassembling an object from its parts or fragments has never been addressed with a unified computational approach, which depends on the pure geometric form of the parts and not application-specific features. We propose a method for ...
Effective Representation of 2D and 3D Data Using Fractal Interpolation
Found in: Cyberworlds, International Conference on
By Polychronis Manousopoulos, Vassileios Drakopoulos, Theoharis Theoharis, Pavlos Stavrou
Issue Date:October 2007
pp. 457-464
Methods for representing curves in \mathbb{R}^2 and \mathbb{R}^3 using fractal interpolation techniques are presented. We show that such representations are both effective and convenient for irregular or complicated data. Experiments in various datasets, i...
Simplification of Vector Fields over Tetrahedral Meshes
Found in: Computer Graphics International Conference
By Nikos Platis, Theoharis Theoharis
Issue Date:June 2004
pp. 174-181
<p>Vector fields produced by experiments or simulations are usually extremely dense, which makes their manipulation and visualization cumbersome. Often, such fields can be simplified without much loss of information.</p> <p>A simplificati...
Fast Fragment Assemblage Using Boundary Line and Surface Matching
Found in: Computer Vision and Pattern Recognition Workshop
By Georgios Papaioannou, Theoharis Theoharis
Issue Date:June 2003
pp. 2
In the recent past, fragment matching has been treated in two different approaches, one using curve matching methods and one that compares whole surfaces or volumes, depending on the nature of the broken artefacts. Presented here is a fast, unified method ...
A Functional View of Parallel Computer Graphics
Found in: Computer Systems and Applications, ACS/IEEE International Conference on
By Ali E. Abdallah, Theoharis Theoharis
Issue Date:June 2001
pp. 0242
Abstract: The main purpose of this paper is to present a functional view of the fundamentals of the computer graphics process based on the classic polygonal model. There are several advantages for adopting such an approach. Firstly, the functional view is ...
Virtual Archaeologist: Assembling the Past
Found in: IEEE Computer Graphics and Applications
By Georgios Papaioannou, Evaggelia-Aggeliki Karabassi, Theoharis Theoharis
Issue Date:March 2001
pp. 53-59
This article describes a semi-automatic system for the reconstruction of archaeological finds from their fragments. Virtual Archaeologist is a system that uses computer graphics to calculate a measure of complementary matching between scanned data and empl...
Segmentation and Surface Characterization of Arbitrary 3D Meshes for Object Reconstruction and Recognition
Found in: Pattern Recognition, International Conference on
By Georgios Papaioannou, Evaggelia-Aggeliki Karabassi, Theoharis Theoharis
Issue Date:September 2000
pp. 1734
Polygonal models are the most common representation of structured 3D data in computer graphics, pattern recognition and machine vision. The method presented here automatically identifies and labels all compact surface regions of a polygonal mesh, visible o...
UR3D-C: Linear dimensionality reduction for efficient 3D face recognition
Found in: Biometrics, International Joint Conference on
By Omar Ocegueda,Georgios Passalis,Theoharis Theoharis,Shishir K. Shah,Ioannis A. Kakadiaris
Issue Date:October 2011
pp. 1-6
We present a novel approach for computing a compact and highly discriminant biometric signature for 3D face recognition using linear dimensionality reduction techniques. Initially, a geometry-image representation is used to effectively resample the raw 3D ...
CIL3D: a content-based 3D model search engine
Found in: Proceedings of the 3rd international conference on Digital Interactive Media in Entertainment and Arts (DIMEA '08)
By Ioannis Pratikakis, Panagiotis Papadakis, Stavros Perantonis, Theoharis Theoharis
Issue Date:September 2008
pp. N/A
We present a prototype 3D model search engine called CIL3D (Computational Intelligence Laboratory 3D). CIL3D provides query-by-content 3D model search, by employing a state-of-the-art method [1] for the description of a 3D model, attaining top performance....