Semi-automatic modeling of buildings from digital surface models

Semi-automatic building detection and extraction is a topic of growing interest due to its potential application in such areas as cadastral information systems, cartographic revision, and GIS. One of the existing strategies for building extraction is to use a digital surface model (DSM) represented by a cloud of known points on a visible surface, and comprising features such as trees or buildings. Conventional surface modeling using stereo-matching techniques has its drawbacks, the most obvious being the effect of building height on perspective, shadows, and occlusions. The laser scanner, a recently developed technological tool, can collect accurate DSMs with high spatial frequency. This paper presents a methodology for semi-automatic modeling of buildings which combines a region-growing algorithm with line-detection methods applied over the DSM.

Conflitos de uso do solo em APPs na bacia hidrográfica do córrego Barra Seca (Pederneiras/SP) em função da legislação ambiental

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Caracterização de conflitos de uso do solo em apps na bacia hidrográfica do córrego barra seca (pederneiras/sp)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Quantitative fractography under light microscopy: A digital image processing approach

This work is an example of the improvement on quantitative fractography by means of digital image processing and light microscopy. Two techniques are presented to investigate the quantitative fracture behavior of Ti-4Al-4V heat-treated alloy specimens, under Charpy impact testing. The first technique is the Minkowski method for fractal dimension measurement from surface profiles, revealing the multifractal character of Ti-4Al-4V fracture. It was not observed a clear positive correlation of fractal values against Charpy energies for Ti-4Al-4V alloy specimens, due to their ductility, microstructural heterogeneities and the dynamic loading characteristics at region near the V-notch. The second technique provides an entire elevation map of fracture surface by extracting in-focus regions for each picture from a stack of images acquired at successive focus positions, then computing the surface roughness. Extended-focus reconstruction has been used to explain the behavior along fracture surface. Since these techniques are based on light microscopy, their inherent low cost is very interesting for failure investigations.

Identification of Landslide Scars in the Region of the Serra do Mar, São Paulo State, Brazil, Using Digital Image Processing and Spatial Analysis Tools

The objective of the present study, developed in a mountainous region in Brazil where many landslides occur, is to present a method for detecting landslide scars that couples image processing techniques with spatial analysis tools. An IKONOS image was initially segmented, and then classified through a Batthacharrya classifier, with an acceptance limit of 99%, resulting in 216 polygons identified with a spectral response similar to landslide scars. After making use of some spatial analysis tools that took into account a susceptibility map, a map of local drainage channels and highways, and the maximum expected size of scars in the study area, some features misinterpreted as scars were excluded. The 43 resulting features were then compared with visually interpreted landslide scars and field observations. The proposed method can be reproduced and enhanced by adding filtering criteria and was able to find new scars on the image, with a final error rate of 2.3%.

The use of elevation map histograms for topographic heterogeneity analysis

Surface defects are extremely important in mechanical characterization of several different materials. Therefore, the analysis of surface finishing is essential for a further simulation of surface mechanical properties in a customized project in materials science and technology. One of the methods commonly employed for such purpose is the statistical mapping of different sample surface regions using the depth from focus technique. The analysis is usually performed directly from the elevation maps which are obtained from the digital image processing. In this paper, the possibility of quantifying the surface heterogeneity of Silicon Carbide porous ceramics by elevation map histograms is presented. The advantage of this technique is that it allows the qualitative or quantitative verification of all surface image fields that cannot be done by using the Surface Plot plugin of image J™ platform commonly used in digital image processing. © 2012 Springer Science+Business Media, LLC.

Geração automática de Trimap para Matting Digital de Imagens e Vídeo

Pós-graduação em Ciência da Computação - IBILCE

As multiplicidades espaciais na comunicação midiática digital

Pós-graduação em Comunicação - FAAC

Conteúdo educativo para a televisão digital interativa

Pós-graduação em Televisão Digital: Informação e Conhecimento - FAAC

Projeto, processo e produto: cartografia do design de conexões na televisão digital

Pós-graduação em Televisão Digital: Informação e Conhecimento - FAAC

Metodologias de desenvolvimento de objetos de aprendizagem: mapeamento para construção na TV digital

Pós-graduação em Televisão Digital: Informação e Conhecimento - FAAC

Demandas profissionais na produção de conteúdo para televisão digital: um estudo do caso da TV Brasil

Pós-graduação em Televisão Digital: Informação e Conhecimento - FAAC

Processamento digital de fotografias aéreas para análise do uso do solo

Pós-graduação em Agronomia (Energia na Agricultura) - FCA

Apropriação da informação: um olhar sobre as políticas públicas sociais de inclusão digital

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

As relações públicas na ambiência da comunicação móvel digital: o QR code como estratégia de comunicação

The internet as well as all technologies arising from it are transforming and changing socially and economically, the forms of relationships between people and organizations. The environment of digital mobile communication is on the rise, allowing more communication strategies in public relations to be enhanced, in order to allow effective dialogue, relationship and interaction between organizations and their stakeholders. Accordingly, the purpose of this paper is to analyze digital communications, especially a locative media tool that has been gaining ground in communication activities: Quick Response Code. So in addition to conceptualize and contextualize it, one tried to map out various campaigns, both national and international, who made use of the QR Code, highlighting the strategic role that this tool can have in Integrated PR planning, in order to create visibility and to establish effective and lasting relationships with the brand / organization