In this paper, we present a new approach for contour detection in the frame of OCT images of the cornea. With the aim of detecting upper and lower curves that define the cornea in radial slices, we have elaborated a t...
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In this paper, we present a new approach for contour detection in the frame of OCT images of the cornea. With the aim of detecting upper and lower curves that define the cornea in radial slices, we have elaborated a three step specific method. The first step consists in finding epithelium and endothelium points (we call them anchor points). Then the image is preprocessed to enhance the contrast and to reduce speckle. In the final step both anchor points are used as starting points for the algorithm: we trace the contour of the cornea pixel by pixel from these two points with a weight criterion. Taking into account geometrical knowledge of the cornea enhances the robustness of the technique. We validate our approach on a bank of scans including low quality images.
SysML, the dedicated system-level UML-based notations proposed by the OMG, is gaining a lot of momentum to be widely accepted by system-level designers. IEEE has standardized SystemC to gain the fame of being powerful...
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SysML, the dedicated system-level UML-based notations proposed by the OMG, is gaining a lot of momentum to be widely accepted by system-level designers. IEEE has standardized SystemC to gain the fame of being powerful at the system-level architectural design and verification. Building on both SystemC and SysML success, we have dedicated this research to study and prototype the automatic translation of SysML designs into SystemC models. This work is an attempt to accelerate the SoC design process by raising the abstraction level in an automated environment.
The use of textures is fundamental in several areas of computergraphics, computer Vision and Image Processing. In this work, we focus on their main relevant attributes, in order to define and design textures as effec...
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The crossing number of a graph is the minimum number of edge crossings in any drawing of the graph into the plane. This very basic property has been studied extensively in the literature from a theoretic point of view...
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Recently, depth-image-based rendering has been suggested for 3D video creation, in which a monoscopic video stream is recorded along with a depth (range) video stream and a stereoscopic video stream is then generated ...
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Elswhere we have introduced a construction to produce biorthogonal multiresolutions from given subdivisions. This construction was formulated in matrix terms, which is appropriate for curves and tensor-product surface...
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We present a variational approach to motion estimation of instationary fluid flows. Our approach extends prior work along two directions;(i) The full incompressible Navier-Stokes equation is employed in order to obtai...
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We present a novel approach to producing facial expression animations for new models. Instead of creating new facial animations from scratch for each new model created, we take advantage of existing animation data in ...
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ISBN:
(纸本)1595933646
We present a novel approach to producing facial expression animations for new models. Instead of creating new facial animations from scratch for each new model created, we take advantage of existing animation data in the form of vertex motion vectors. Our method allows animations created by any tools or methods to be easily retargeted to new models. We call this process expression cloning and it provides a new alternative for creating facial animations for character models. Expression cloning makes it meaningful to compile a high-quality facial animation library since this data can be reused for new models. Our method transfers vertex motion vectors from a source face model to a target model having different geometric proportions and mesh structure (vertex number and connectivity). With the aid of an automated heuristic correspondence search, expression cloning typically requires a user to select fewer than ten points in the model. Cloned expression animations preserve the relative motions, dynamics, and character of the original facial animations.
The simulation of wireless networks has been an important tool for researchers and the industry in the last years. Especially in the field of Mobile Ad Hoc Networking, most current results have been achieved using sim...
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ISBN:
(纸本)1595934774
The simulation of wireless networks has been an important tool for researchers and the industry in the last years. Especially in the field of Mobile Ad Hoc Networking, most current results have been achieved using simulators. The need for reproducible results and easy to observe environments limits the use of real world measurements for those kind of networks. It is stated here that the radio wave propagation model has a strong impact on the results of the simulation run. This work shows the limitations of current simulation environments and describes a high accuracy propagation model based on the use of a ray-tracer. By using a parallelized preprocessing step we made this propagation model feasible for usage in network simulators. Based on two examples, the effects on characteristic performance properties in Mobile Ad Hoc Networks are shown. We found that the physical layer simulation has a great impact on routing protocol efficiency. Copyright 2006 ACM.
We report on experimental studies regarding the cost of exact and approximate convex hull computation in the plane in order to find out how much time you can save by the transition to approximations. Our experiments l...
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