Scene understanding for auto-calibration of surveillance cameras

In the last decade, several research results have presented formulations for the auto-calibration problem. Most of these have relied on the evaluation of vanishing points to extract the camera parameters. Normally vanishing points are evaluated using pedestrians or the Manhattan World assumption i.e. it is assumed that the scene is necessarily composed of orthogonal planar surfaces. In this work, we present a robust framework for auto-calibration, with improved results and generalisability for real-life situations. This framework is capable of handling problems such as occlusions and the presence of unexpected objects in the scene. In our tests, we compare our formulation with the state-of-the-art in auto-calibration using pedestrians and Manhattan World-based assumptions. This paper reports on the experiments conducted using publicly available datasets; the results have shown that our formulation represents an improvement over the state-of-the-art.

Mice and larvae tracking using a particle filter with an auto-adjustable observation model

This paper proposes a novel way to combine different observation models in a particle filter framework. This, so called, auto-adjustable observation model, enhance the particle filter accuracy when the tracked objects overlap without infringing a great runtime penalty to the whole tracking system. The approach has been tested under two important real world situations related to animal behavior: mice and larvae tracking. The proposal was compared to some state-of-art approaches and the results show, under the datasets tested, that a good trade-off between accuracy and runtime can be achieved using an auto-adjustable observation model. (C) 2009 Elsevier B.V. All rights reserved.

Automatic devices for monitoring environmentally induced auto-oxidative degradation of artistic materials in conservation sites

This paper describes an automatic device for in situ and continuous monitoring of the ageing process occurring in natural and synthetic resins widely used in art and in the conservation and restoration of cultural artefacts. The results of tests carried out under accelerated ageing conditions are also presented. This easy-to-assemble palm-top device, essentially consists of oscillators based on quartz crystal resonators coated with films of the organic materials whose response to environmental stress is to be addressed. The device contains a microcontroller which selects at pre-defined time intervals the oscillators and records and stores their oscillation frequency. The ageing of the coatings, caused by the environmental stress and resulting in a shift in the oscillation frequency of the modified crystals, can be straightforwardly monitored in this way. The kinetics of this process reflects the level of risk damage associated with a specific microenvironment. In this case, natural and artificial resins, broadly employed in art and restoration of artistic and archaeological artefacts (dammar and Paraloid B72), were applied onto the crystals. The environmental stress was represented by visible and UV radiation, since the chosen materials are known to be photochemically active, to different extents. In the case of dammar, the results obtained are consistent with previous data obtained using a bench-top equipment by impedance analysis through discrete measurements and confirm that the ageing of this material is reflected in the gravimetric response of the modified quartz crystals. As for Paraloid B72, the outcome of the assays indicates that the resin is resistant to visible light, but is very sensitive to UV irradiation. The use of a continuous monitoring system, apart from being obviously more practical, is essential to identify short-term (i.e. reversible) events, like water vapour adsorption/desorption processes, and to highlight ageing trends or sudden changes of such trends. (C) 2007 Elsevier B.V. All rights reserved.

Crise de imagem ou oportunidade de mídia? os bastidores do caso Eloá/Nayara

Artigo apresentado em congresso nacional de comunicação

Imagem publicitária e semiótica aplicada

Usando como base algumas das idéias defendidas por Juremir Machado da Silva em seu livro O que Pesquisar quer dizer (2010), o presente texto se propõe a reafirmar a velha crença de que as teorias semióticas, independente de suas bases teóricas, servem às pesquisas empíricas à medida que permitem ao pesquisador compreender a estrutura interna das linguagens (questão também abordada em CARDOSO, 2010). E, através dessa idéia, apresentar a atual pesquisa do grupo O signo visual nas mídias, que cuida, nesse momento, da aplicação de diferentes teorias semióticas em um único objeto, uma peça publicitária.

Obesidade infantil na WEB: páginas gordas de informação e magras de qualidade?

O trabalho busca mapear grandes portais de notícias e páginas destinadas especificamente ao público infantil para detectar a quantidade e qualidade das informações sobre o tema obesidade infantil que vêm sendo oferecidas na Web. Atualmente uma das principais fontes de informações para adultos e crianças digitalmente incluídas são os grandes portais, espaços nobres de notícias e fonte de consultas para trabalhos escolares e também de entretenimento. Como os referidos espaços de consulta tendem a ter acesso democratizado com a adoção da informática nas escolas públicas, o presente trabalho quer identificar o que vem sendo oferecido sobre um dos males que mais aflige as crianças: a obesidade infantil.

Obesidade como pauta nos suplementos jornalísticos infantis: presença subliminar ou ausência premeditada?

O trabalho busca mapear a presença de matérias sobre obesidade infantil nos jornais de maior circulação em São Paulo: Folha de S.Paulo e O Estado de S.Paulo - e seus respectivos suplementos infantis - Folhinha e Estadinho. A presente pesquisa quer identificar o que vem sendo oferecido de informações para as crianças sobre um dos males que mais aflige as crianças, a obesidade infantil, as fontes de informação e principais enfoques das matérias.

Comunicação organizacional: contribuições para formação de uma imagem positiva da empresa com o público interno

artigo publicado na revista Comunicação: Veredas (UNIMAR), 2011

A influência da cidadania empresarial na imagem corporativa

Disponível na pintegra no link: http://portalrevistas.ucb.br/index.php/esf/article/viewFile/2937/2169