Elena Ovreiu

University Politehnica of Bucharest, Electronics, Telecommunications and Information Technology, Faculty Member

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David Sorfa

University of Edinburgh

Judith L Green

University of California, Santa Barbara

Beat Signer

Vrije Universiteit Brussel

James Elkins

School of the Art Institute of Chicago

E. Wayne Ross

University of British Columbia

Aaron Gerow

Yale University

Maurizio Forte

Duke University

David Seamon

Kansas State University

Joao Comba

Universidade Federal do Rio Grande do Sul

William Brown

University of British Columbia

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Papers by Elena Ovreiu

An Exploratory Study for Glaucoma Detection using Densely Connected Neural Networks

2020 International Conference on e-Health and Bioengineering (EHB)

Interactive Planarization and Optimization of 3D Meshes

by Roi Poranne and Elena Ovreiu

Computer Graphics Forum, 2013

ABSTRACT Constraining 3D meshes to restricted classes is necessary in architectural and industria... more ABSTRACT Constraining 3D meshes to restricted classes is necessary in architectural and industrial design, but it can be very challenging to manipulate meshes while staying within these classes. Specifically, polyhedral meshes—those having planar faces—are very important, but also notoriously difficult to generate and manipulate efficiently. We describe an interactive method for computing, optimizing and editing polyhedral meshes. Efficiency is achieved thanks to a numerical procedure combining an alternating least‐squares approach with the penalty method. This approach is generalized to manipulate other subsets of polyhedral meshes, as defined by a variety of other constraints.

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Mesh simplification using an accurate measured quadratic error

ISSCS 2011 - International Symposium on Signals, Circuits and Systems, 2011

In this paper we propose a new surface simplifica- tion algorithm which produces high quality app... more In this paper we propose a new surface simplifica- tion algorithm which produces high quality approximations of the original models. The geometric simplification is based on iterative edge contractions. To get a simplified mesh which fairly fits the original one, we introduce an accurate measure of quadratic error to characterize the geometric deviation introduced by edge collapse. In addition, we

AN ONLINE CLOUD BASED MOBILE ENABLED 3D HUMAN BODY E-LEARNING SOLUTION

by Elena Ovreiu and Alin Moldoveanu

Detection of thrown objects using ToF cameras

2013 IEEE 9th International Conference on Intelligent Computer Communication and Processing (ICCP), 2013

ABSTRACT This paper deals with the issue of thrown or dropped object detection as an application ... more ABSTRACT This paper deals with the issue of thrown or dropped object detection as an application of the 3D time-of-flight (ToF) camera. The use of distance information provided by the ToF camera makes the segmentation step straight forward. Then, instead of high computational motion detection and estimation algorithms, mainly a labeling and tracking procedure is used. This approach provides real time low complexity object detection and trajectory estimation. The method is validated on 50 video sequences taken with the ToF camera.

Triangular mesh simplification using an adaptive subdivision

International Symposium on Signals, Circuits and Systems ISSCS2013, 2013

ABSTRACT In this paper we present a triangular mesh simplification algorithm which produces accur... more ABSTRACT In this paper we present a triangular mesh simplification algorithm which produces accurate approximations of the original models. The simplification is realized using iterative edge contractions. The accuracy is obtained using a symmetric error metric and generating sample points over the simplified mesh. The sample points are generated using iterative 1 : 4 subdivisions of each triangle. The number of subdivisions for each triangle depends on the area of the triangle.

Interactive Planarization and Optimization of 3D Meshes

Computer Graphics Forum, 2013

Constraining 3D meshes to restricted classes is necessary in architectural and industrial design,... more Constraining 3D meshes to restricted classes is necessary in architectural and industrial design, but it can be very challenging to manipulate meshes while staying within these classes. Specifically, polyhedral meshes -those having planar faces -are very important, but also notoriously difficult to generate and manipulate efficiently. We describe an interactive method for computing, optimizing and editing polyhedral meshes. Efficiency is achieved thanks to a numerical procedure combining an alternating least-squares approach with the penalty method. This approach is generalized to manipulate other subsets of polyhedral meshes, as defined by a variety of other constraints.

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Developing a miniaturized continuous flow electrochemical cell for biosensor applications

by walter vastarella, Mihaela Ilie, and Elena Ovreiu

The development of a miniaturized electrochemical cell for biosensor application regards both the... more The development of a miniaturized electrochemical cell for biosensor application regards both the structuring of an array of electrodes in a fluidic chamber and their connections to the control & processing unit The sensitivity of the chrono-amperometric measurement performed with the cell is increased by: (a) integrating the reference electrode on the same chip with the counter- and working- electrodes, (b) designing a specific pattern of the gold electrodes and (c) serially distributing them along the pipeline reservoir. Borosilicate glass is used as substrate for the electrodes, allowing, due to its transparency, an accurate and easy pad to pad alignment of the up-side-down chip versus a PCB soldered on a standard DIL 40 socket. This alignment is necessary to accomplish the elastomer-based-solderless electric contact, between chip and PCB. The solderless contact significantly improves both reliability and signal processing accuracy. The reservoir and its cover are micromachined out of silicone rubber respectively photosensitive glass in order to easy disassemble the fluidic chamber without any damage. Both thickness and elasticity of the photosensitive glass rend the device less brittle. A plug-in -plug-flow device with improved characteristics has been obtained with a modular structure that allows further extension of the number of electrodes.

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An Exploratory Study for Glaucoma Detection using Densely Connected Neural Networks

2020 International Conference on e-Health and Bioengineering (EHB)

Interactive Planarization and Optimization of 3D Meshes

by Roi Poranne and Elena Ovreiu

Computer Graphics Forum, 2013

Download

Mesh simplification using an accurate measured quadratic error

ISSCS 2011 - International Symposium on Signals, Circuits and Systems, 2011