Architecture For Multi-camera Vision System For Automated Measurement Of Automotive Components

This paper proposes the architecture of a multi-view cameras system with the purpose of online dimensional measuring of automotive components, specifically crankshafts. The introduction of a measuring vision system in a production line allows the dimensional quality control of all manufactured items, helping to optimize the process. The system consists of six digital cameras, positioned around the object, capturing different perspective images of the product. Processing of the images yields results of precise dimensional measurements of the product. The paper presents the ideas and algorithms used in the proposed measurement system, and virtual images simulation to access its operational and precision characteristics. © 2013 IEEE.520527Orth, A., (1998) Development and Implementation of A System of Recognition Auto Parts, , Congress of the Brazilian Computer SocietySalvi, J., Armangué, X., Battle, J., Comparative review of camera calibrating methods with accuracy evaluation (2002) Pattern Recognition, pp. 1617-1635Kurka, P.R., Rudek, M., (2005) 3-D Image Signal Processing for Automates Operations Using Range, , XI DYNAMELowe, D.G., (2004) Distinctive Image Features from Scale-Invariant Keypoints, , Vancouver, B.C., Canadá: University of British ColumbiaVedaldi, A., (2002) An Implementation of SIFT Detector and Descriptor, , Los Angeles: University of California at Los AngelesTrucco, E., Verri, A., (1998) Introductory Techniques for 3-D Computer Vision, , Prentice HallZhang, Z., A flexible new technique for camera calibration (2000) IEEE Transactions on Pattern Analysis and Machine Intelligence, pp. 1330-1334Bouguet, J.Y., (1999) Visual Methods for Three-dimensional Modeling, , Pasadena,California.,USA: California Institute of Technologyhttp://www.blender.org, BLENDER 3D. Available in. Access in: 23 jan. 2013http://www.ni.com, LABVIEW. Available in. Access in: 22 jan. 201

Eficiência térmica de telhas onduladas de fibrocimento aplicadas em abrigos individuais para bezerros expostos ao sol e à sombra Thermal efficiency of fiber cement corrugated sheets applied to individual housing for calves exposed to sun and shade

Este trabalho apresenta um estudo da eficiência térmica de coberturas de bezerreiros individuais expostas ao sol e à sombra, por meio de termografia infravermelha, temperatura interna e índices de conforto térmico. Foram avaliados quatro bezerreiros, três expostos ao sol, a saber: (i) cobertos com telhas de fibrocimento sem amianto - pintadas de branco, (ii) sem pintura e (iii) com sombrite posicionado internamente aos bezerreiros, à distância de 0,10m da face inferior da telha. O quarto bezerreiro foi instalado em área sombreada e coberto com telhas de fibrocimento sem pintura. As coletas de dados foram realizadas durante 21 dias, nos horários das 11h00min, 14h00min e 17h00min. Os resultados mostraram variações significativas na temperatura de superfície das coberturas e nos índices de conforto térmico, entre os tratamentos expostos ao sol e à sombra, para todos os horários avaliados. As imagens termográficas infravermelhas mostraram-se eficientes para melhor compreensão dos processos de transferência de calor da cobertura para o interior das instalações.<br>This research presents a study of roof thermal efficiency in individual housing for calves exposed to sun and shade through infrared thermography, internal temperature and thermal comfort indexes. Four different individual housing for calves covered with asbestos-free fiber-cement corrugated sheets were evaluated. Three of them were directly exposed to the sun: (i) corrugated sheets painted white in the external surface, (ii) corrugated sheets without painting and (iii) with screen shade fabric installed 0.10m under de internal surface of the corrugated sheet. The fourth individual housing was installed in the shade area and covered with unpainted corrugated fiber-cement sheets. The analysis was taken for 21 days at 11h00min, 14h00min and 17h00min. The results indicate significant variations in the roofing surface temperature and thermal comfort indexes among the treatments exposed to the sun and shade, for all the evaluations during the day. The infrared thermography images were effective for better understanding the heat transfer processes from the roof to the internal environment of the housing