Calibração da técnica de moiré aplicada a perfilometria de protótipos mecânicos

Gomes, Túlio Seabra; Braga, Roberto A.; Lino, Antonio Carlos Loureiro; Rabelo, Giovanni Francisco; Costa, Rafaela Lira Mendes

doi:10.1590/s1413-70542009000200033

Cited by 8 publications

(9 citation statements)

References 5 publications

(5 reference statements)

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“…Correcting deformations can be achieved through the increase in the quality of the images obtained with the cameras or through the digital correction of the deformation. Gomes et al (2009) proposed a correction of the deformation in the axis out of the plane, thus correcting the distortion in only one axis through a constant value. This calibration by a constant value in only one axis does not correct distortions completely, thus requiring the adoption of other digital techniques to correct deformations in the three axes of the image.…”

Section: Introductionmentioning

confidence: 99%

Measurement of volume of macaw palm fruit using traditional and the digital Moiré techniques

Costa

Ribeiro

Braga

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe macaw palm crop has been studied because of its bioenergy potential due to the high oil yield, which is linked to fruit maturity stage. Digital images have been adopted as a contactless way to obtain information about fruit surface area and volume, acting as a sensor for quality control and the classification of fruits, based on physical aspects during the maturation stage. The aim of this study was to estimate the volume of macaw palm fruits from digital models obtained by the Moiré technique using only one camera, associated with digital imageprocessing tools to unwarp the images, allowing the comparison with conventional methods. The volumes obtained by the Moiré technique were compared with those obtained by water displacement method (WDM) and millet-seed displacement method (SDM). The results show that the volumes measured by the Moiré technique exhibited a mean error of 13.54% compared with the SDM, and 11.09% when compared to WDM, which indicates that the digital Moiré technique is a robust, low-cost tool to measure the volume of macaw palm fruits.Mensuração do volume do fruto de macaúba por meio das técnicas convencionais e pela técnica digital de Moiré R E S U M OA cultura da macaúba vem sendo estudada devido ao seu potencial bioenergético propiciado pela alta produtividade de óleo que, por sua vez, está associado ao estádio de maturação do fruto. Imagens digitais têm sido utilizadas como forma para extrair informações sem contato sobre a área superficial e volume de frutos, com a finalidade de construir sensores que possam atuar no controle de qualidade e classificação a partir de aspectos físicos ligados ao estádio de maturação. O objetivo deste trabalho foi estimar o volume do fruto de macaúba a partir de imagens digitais obtidas pela técnica de Moiré por meio de uma única câmera associada ao uso de técnicas de correção digital da deformação das imagens, comparando os volumes estimados por métodos convencionais. Os volumes obtidos pela técnica de Moiré foram comparados com os volumes obtidos pelo método de deslocamento de coluna de água e pelo método do deslocamento de sementes de painço. Os volumes medidos pela técnica de Moiré apresentam um erro médio de 13,54 e de 11,09% quando comparados aos métodos convencionais, sendo considerada uma alternativa robusta e de baixo custo para a mensuração do volume de frutos de macaúba.

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Section: Introductionmentioning

confidence: 99%

Measurement of volume of macaw palm fruit using traditional and the digital Moiré techniques

Costa

Ribeiro

Braga

et al. 2016

Rev. bras. eng. agríc. ambient.

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“…A projeção da TM ainda foi usada para criar modelos digitais de superfície de peras (LINO, 2002), determinar a área superficial de frangos de corte (SILVA, 2007), traçar a topografia de pedaços de madeira e de galinhas (COSTA et al, 2008), analisar esforços de compressão em bambu (BERALDO et al, 2007), reconstruir a superfície de uma maçã ) e visualizar linhas de força eletromagnéticas ao redor de duas cargas paralelas (YUK et al, 2008). Além disso, GOMES et al (2009) propuseram uma metodologia de calibração aplicada à TM para investigações perfilométricas em protótipos mecânicos e ZHAO & ZHANG (2006) concluíram que a TM tem aplicação em estudos mecânicos de objetos biológicos.…”

Section: Introductionunclassified

Recuperação da topografia de ovos por meio da técnica de moiré e calibração independente

Silva¹,

Yanagi²,

Silva³

et al. 2011

Eng. Agríc.

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RESUMO:A recuperação da topografia de ovos por meio de análise de imagens digitais permite, de forma não destrutiva, a estimativa das massas da gema, da clara, da casca e totais, que são produtos amplamente utilizados na esfera industrial. O presente trabalho buscou desenvolver uma metodologia para a recuperação da forma tridimensional de ovos por meio de análise de imagens, em especial usando a técnica de moiré. Foram utilizados ovos de diferentes tamanhos, classificados em: XL (mais de 73 g), L (63 a 73 g), M (53 a 63 g) e S (até 53 g). Em cada teste realizado em laboratório, um ovo, aleatoriamente selecionado, foi iluminado com a projeção de grades, e as imagens foram capturadas e processadas para a obtenção da forma tridimensional do objeto pela técnica de moiré (TM). As dimensões dos seus eixos principais foram medidas por meio de um paquímetro, sendo usadas como referência para calibração da TM. Equações empíricas foram ajustadas para a correção das dimensões, apresentando coeficiente de determinação de 0,961; 0,955 e 0,988. A TM mostrou-se adequada para a recuperação da topografia de ovos, proporcionando erros menores ou iguais a 5,47%, com a clara necessidade de uma calibração independente, nas três dimensões, e sem a necessidade de usar um objeto calibrador. PALAVRAS-CHAVE:análise de imagens, ovo, forma tridimensional. EGGS' TOPOGRAPHY RECOVERY BY MEANS OF THE MOIRÉ TECHNIQUE AND BY AN INDEPENDENT CALIBRATION ABSTRACT:The recovery of the topography of eggs using digital images analysis allows the prediction with a non-destructive and with a non-contact way of the egg mass, yolk, egg white, and eggshell, which are products widely used in the industrial sphere. The present research seeks to develop a methodology to recovery the tridimensional shape of eggs through image analysis, in particular by the moiré technique with the proposition of an independent calibration. For the accomplishment of this research, eggs of different sizes classified in XL (more than 73g), L (63 to 73g), M (53 to 63 g), and S (until 53 g) were used. In each test realized at the laboratory, one egg, randomly selected was illuminated with the projection of grids and the images were taken and processed to obtain the tridimensional shape of the object by moiré technique (TM). The dimensions of its main axes were measured by means of a caliper rule, being used as a reference for the TM calibration. Empirical equations were adjusted for the correction of the dimensions, presenting coefficient of determination of 0.961, 0.955, and 0.988. TM showed to be adequate for recovering the egg topography providing errors smaller or equal to 5.47%, with a clear demand of an independent calibration in the three dimensions, and without any standard object.

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“…This technique is notable for being a non-invasive and non-destructive method, being an alternative for soil profile studies, such as agricultural machine traffic, which can cause overloading of the soil and possible damage to the development of crops (Lino and Dal Fabbro, 2004) and (Mckenzie, 2015). This interferometric technique can be seen in applications such as the estimation of the surface area of broilers (Silva, 2007), in the measurementof the volume of macaúba fruit (Costa et al, 2016), in topography of eggs, estimating the mass of the yolk, white, bark and all the egg (Silva et al, 2011) and also in the investigations of surface profile in mechanical prototypes, seeking low costs and flexibility (Gomes et al, 2009), besides the postural analysis of humans (Fernandes et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Development of an Optical Technique for Scan the Soil After the Contact With Wheels

Coelho¹,

Ribeiro

Braga³

2019

Theor Appl Eng

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Soil is a collection of natural bodies, that are made of solid parts, liquid and gas, three-dimensionally and formed by mineral sand organic materials, containing living matter one of the mantle surface of the planet, providing the development of agriculture that is essential and irreplaceable to human life. In agriculture, the use of mechanization arms to increase productivity, once the global population grows everyday, increasing the demand for food and avoiding deforestation for opening new agricultural frontiers. The use of machinery in agriculture requires full knowledge of its operation, adjustments and maintenance, as well as the compatibility of soil-working machine, otherwise it may cause impacts to the soil and therefore to the environment. So it is critical to understand the effects that the tires of the tractor can cause during the transit of tractors through agricultural areas, giving preference to monitoring techniques that avoid contact with the soil and demands great consumption of time and labor. This study evaluated the interferometric technique as a potential alternative to traditional manual processes or high cost equipment and proposed a protocol to be used in the field besides testing the methodology of a laser scanner. The results showed the feasibility of the proposed technique in the laboratory and in the field in addition to copy the soil 3D profile and identify the deformations caused by the tread.

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Calibração da técnica de moiré aplicada a perfilometria de protótipos mecânicos

Cited by 8 publications

References 5 publications

Measurement of volume of macaw palm fruit using traditional and the digital Moiré techniques

Measurement of volume of macaw palm fruit using traditional and the digital Moiré techniques

Recuperação da topografia de ovos por meio da técnica de moiré e calibração independente

Development of an Optical Technique for Scan the Soil After the Contact With Wheels

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