Oversampled filter banks (OFBs) have recently gained interest for different applications, including subband adaptive filtering, echo cancellation and even coding. The existing theory on filter banks is mainly concentr...
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Oversampled filter banks (OFBs) have recently gained interest for different applications, including subband adaptive filtering, echo cancellation and even coding. The existing theory on filter banks is mainly concentrated on critically decimated filter banks. It is shown how existing structures for implementation and design of critically decimated filter banks can be exploited in order to implement and/or design OFBs. The structures based on a Smith-McMillan decomposition are explored.
Searching specific structures of different scales in digital images, we tested multiple alternatives of a mobile window method, developed starting from an algorithm by Cayula and Cornillon. These alternatives presente...
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Searching specific structures of different scales in digital images, we tested multiple alternatives of a mobile window method, developed starting from an algorithm by Cayula and Cornillon. These alternatives presented an increasing computing cost when detecting meso-structures in complex images. Quality borders required processing a great number of window-threshold pairs, because to detect some structures was required to relax the work conditions (bimodality and cohesion). Our proposal, in this work, is relaxing the conditions but not for all the window-threshold pairs, only to a selected set of windows, those near windows that accomplish strict conditions. We propose a new method that is a combination of the mobile window one, previously used, and the seeded regions approach. In this case, we seed not regions but borders.
People highlight the intended interpretation of their utterances within a larger discourse by a diverse set of nonverbal signals. These signals represent a key challenge for animated conversational agents because they...
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People highlight the intended interpretation of their utterances within a larger discourse by a diverse set of nonverbal signals. These signals represent a key challenge for animated conversational agents because they are pervasive, variable, and need to be coordinated judiciously in an effective contribution to conversation. In this paper we describe a freely-available cross-platform real-time facial animation system, RUTH, that animates such high-level signals in synchrony with speech and lip movements. RUTH adopts an open, layered architecture in which fine-grained features of the animation can be derived by rule from inferred linguistic structure, allowing us to use RUTH, in conjunction with annotation of observed discourse, to investigate the meaningful high-level elements of conversational facial movement for American English speakers.
In this paper, we outline the similarities between oversam-pled filter banks and classical error-correcting codes. We recall the geometric interpretation of oversampling in terms of subspaces and that of the subband s...
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This paper deals with some detection issues of watermark signals. We propose an easy way to implement an informed watermarking embedder whatever the detection function. This method shows that a linear detection functi...
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This paper deals with some detection issues of watermark signals. We propose an easy way to implement an informed watermarking embedder whatever the detection function. This method shows that a linear detection function is not suitable for side information. This is the reason why we build a family of nonlinear functions named JANIS. Used with a side-informed embedder, its performance is much better than the classical spread spectrum method.
In this paper we propose the use of mixtures of truncated exponential (MTE) distributions in hybrid Bayesian networks. We study the properties of the MTE distribution and show how exact probability propagation can be ...
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In this paper we introduce an improvement over importance sampling propagation algorithms in Bayesian networks. The difference with respect to importance sampling is that during the simulation, configurations are obta...
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Fusion theorem is a classical result that allows the simplification of the morphisms among homogeneus structures [10]. We present this theorem and some generalizations in the context of the constructive proof assistan...
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This paper describes an action semantics for UML based on the Meta-Modelling Language (MML) - a precise meta-modelling language designed for developing families of UML languages. Actions are defined as computational p...
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The paper shows a method to compute a posteriori intervals of probabilities when the initial conditional information is given also with intervals of probabilities. The right way of doing an exact computation is with t...
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