892 resultados para Graph Cut
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Fresh-cut fruit products, including carambola (Averrhoa carambola L.) have limited marketability due to cut surface browning attributed to oxidation of phenolic compounds by enzymes such as polyphenol oxidase (PPO). The objective of this study was to evaluate postharvest changes of carambola slices in three different packagings. Carambola fruit (cv. Fwang Tung) were picked from the orchard of Estação Experimental de Citricultura de Bebedouro at mature-green stage. Fruit were washed, dipped in NaOCl solution (200 mg.L -1 for 5 minutes), and stored overnight at 10°C. Fruit were manually sliced into pieces of approximately 1 cm. Slices were rinsed with NaOCl solution at 20 mg.L-1, drained for 3 minutes, and packaged in polyethylene terephthalate (PET) trays (Neoform N94); polystyrene trays covered with PVC 0.017 mm (Vitafilm - Goodyear); and vacuum sealed polyolefin bags (PLO, Cryovac PD900). The packages were stored at 6.8°C and 90%RH for 12 days and samples taken every 4 days. PET trays and PVC film did not significantly modify internal atmosphere and the high water permeability of PVC led to more rapid slice desiccation. PPO activity was lower when slices were packaged in PLO vacuum sealed bags, which reduced discolouration and led to better appearance maintenance for up to 12 days.
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Thermal faceprint has been paramount in the last years. Since we can handle with face recognition using images acquired in the infrared spectrum, an unique individual's signature can be obtained through the blood vessels network of the face. In this work, we propose a novel framework for thermal faceprint extraction using a collection of graph-based techniques, which were never used to this task up to date. A robust method of thermal face segmentation is also presented. The experiments, which were conducted over the UND Collection C dataset, have showed promising results. © 2011 Springer-Verlag.
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Dental recognition is very important for forensic human identification, mainly regarding the mass disasters, which have frequently happened due to tsunamis, airplanes crashes, etc. Algorithms for automatic, precise, and robust teeth segmentation from radiograph images are crucial for dental recognition. In this work we propose the use of a graph-based algorithm to extract the teeth contours from panoramic dental radiographs that are used as dental features. In order to assess our proposal, we have carried out experiments using a database of 1126 tooth images, obtained from 40 panoramic dental radiograph images from 20 individuals. The results of the graph-based algorithm was qualitatively assessed by a human expert who reported excellent scores. For dental recognition we propose the use of the teeth shapes as biometric features, by the means of BAS (Bean Angle Statistics) and Shape Context descriptors. The BAS descriptors showed, on the same database, a better performance (EER 14%) than the Shape Context (EER 20%). © 2012 IEEE.
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Pós-graduação em Ciências Sociais - FFC
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Pós-graduação em Ciências Sociais - FFC
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Pós-graduação em Ciências Sociais - FFC
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Cirurgia Veterinária - FCAV
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Pós-graduação em Matemática - IBILCE
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Pós-graduação em Ciências Sociais - FCLAR
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O corte de aços por disco abrasivo é um dos processos que apresentam as melhores características de economia, eficiência e rapidez, e ainda hoje é muito utilizado no meio industrial se comparado a outros processos tradicionais de corte como o cisalhamento (tesourão), torneamento (sangramento), serragem com serras metálicas, serragem por atrito com lâminas circulares sem dentes e chama oxi-acetileno. Da literatura formal mais recente, nota-se que durante os últimos anos as máquinas para a realização dos cortes foram inovadas. Entretanto, esta atenção não foi dada à ferramenta de corte abrasiva. A falta de literatura técnica dificulta a escolha das condições de corte e da sua otimização no meio industrial. Este fato é agravado pela grande diversidade de discos abrasivos disponíveis no mercado, com diferentes qualidades e preço. As decisões sobre as condições de corte são baseadas em experiências pessoais, sem critério definido, e freqüentemente desprezam os aspectos de segurança inerentes ao processo. A concorrência estrangeira, através da globalização da economia, está obrigando as indústrias nacionais a atenderem os padrões internacionais de qualidade e desempenho. Uma forma das indústrias nacionais tornarem-se mais competitivas é através do conhecimento detalhado das operações de corte com discos abrasivos. Neste trabalho é apresentado um estudo sobre o comportamento de discos abrasivos, submetidos a diversas condições de corte. Os resultados são discutidos em função da análise da velocidade de corte, velocidade de mergulho do disco abrasivo na peça, força tangencial de corte média, tempo de corte e relação G.
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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The rationalization of forest harvesting and minimization costs is a constant search by the managers involved in this process, making them decide practices which are economically viable to optimize that operation. This study aimed to evaluate technically and economically the performance of feller-buncher and the forest processor in stands of eucalypts in first cut. The technique analysis included time and movements, productivity, efficiency operational and mechanical availability. The economic analysis included the parameters operational cost, harvesting cost and energy consumption. Aiming the optimization the cost of forest harvesting, the system composed by feller-buncher and processor forest presented itself as a technically and economically viable alternative to harvesting eucalypt in first cut or stands that do not have bifurcated trees.
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Pós-graduação em Ciências Sociais - FFC