Sensitivity of the moiré technique for measuring biological surfaces

Costa, Rafaela Lira Mendes; Braga, Roberto A.; Oliveira, Bruno Silva de; Silva, E.; Yanagi, Tadayuki; Lima, José Tarcísio

doi:10.1016/j.biosystemseng.2008.04.011

Cited by 14 publications

(10 citation statements)

References 10 publications

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“…Para a recuperação da topografia de materiais biológicos por meio da análise de imagens, vários autores têm utilizado a técnica de moiré (TM), devido principalmente às vantagens de não requerer contato com o objeto, não ser um método destrutivo, apresentar rápida medição, alta sensibilidade, baixo custo e possibilidade de automatização (LINO & DAL FABBRO, 2004;COSOLA et al, 2008;COSTA et al, 2008;LINO et al, 2008;RYU et al, 2008). ASSUNDI & YUNG (1991) definem a TM como uma técnica versátil, baseada na interferência de grades superpostas, e que permite medir deformações de plano, contornos topográficos, perfis, declives, deformações, curvaturas e formas de objetos (COSTA et al, 2008).…”

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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Section: Introductionunclassified

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

Silva¹,

Yanagi²,

Silva³

et al. 2011

Eng. Agríc.

View full text Add to dashboard Cite

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“…Moiré techniques have also been developed and applied for deformation measurements on the nanometer scale [8]. In agricultural engineering, several studies try to determine the topographic contour of biological materials from optical techniques, such as Moiré [9]; this information can be later used on the classification and selection of agricultural products. Considering the applications of the Moiré technique, the aim of this study was to obtain the three-dimensional reconstruction of a grape bunch through a low-cost technique.…”

Section: David Publishingmentioning

confidence: 99%

The Efficiency of the Moiré Technique for Three-Dimensional Measures of Grape Bunches

Fracarolli¹,

Suzigan²,

Fabbro³

2016

JAST-B

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Abstract:This study was carried out in the University of Campinas to study the three-dimensional reconstruction of grape bunches through the application of the Moiré technique as an alternative and innovative method, using low-cost equipment for data acquisition. This study proposed the three-dimensional visualization of grapes and topography on X i axes through the Moiré projection technique. The artificial grapes with a 20 cm long bunch and 18.45 mm average diameter for each grape were used. A projector was used to generate a grid with light and dark lines. The grape bunch was placed on a holder, illuminated by a sinusoidal grid and photographed. After processing the images, a three-dimensional map of the fruit and topography on X i axes were obtained. The three-dimensional fruit observation allows the visualization of the higher and lower regions of the three-dimensional configuration through a color map. This result makes it possible to obtain size and shape of the grape bunch, allowing for the process automation of product selection and classification.

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“…Captured images were processed using Microsoft ® Paint through the phase shift process (Costa et al, 2008). To generate three-dimensional images of the chickens (Figure 3), pre-processed images were input to a function developed for Scilab TM (Scilab Image Processing toolbox, sourceforge.net/projects/siptoolbox) using the Gaussian filter to enhance images.…”

Section: Processing Imagesmentioning

confidence: 99%

“…Park et al (2002) have suggested further efforts to improve machine vision in areas such as dimension, size, orientation and shape reproduction in, for example, poultry safety inspection. The development of non-destructive techniques for geometric measurement of biological specimens can be found in the literature (Prakoonwit and Benjamin, 2007;Kuo and Cheng, 2007;Costa et al, 2008). Acquisition, analysis and recovery of an object's surface characteristics can be obtained through various methods, including profilometric and optical techniques.…”

Section: Introductionmentioning

confidence: 99%

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Digital surface area assessment of broiler chickens

Yanagi¹,

Silva

Braga³

et al. 2011

Eng. Agríc.

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Surface area (SA) of poultry is an important parameter for heat and mass transfer calculations. Optical approaches, such as the moiré technique (MT), are non-destructive, result in accuracy and speed gains, and preserve the object integrity. The objective of this research was to develop and validate a new protocol for estimating the surface area (SA) of broiler chickens based on the MT. Sixty-six Ross breed broiler chickens (twenty-seven male, thirty-nine female, ages spanning all growth phases) were used in this study. The dimensions (length, width and height) and body mass of randomly selected broiler chickens were evaluated in the laboratory. Chickens were illuminated by a light source, and grids were projected onto the chickens to allow their shape to be determined and recorded. Next, the skin and feathers of the chickens were removed to allow SA to be determined by conventional means. These measurements were then used for calibration and validation. The MT for image analysis was a reliable means of evaluating the three-dimensional shape and SA of broiler chickens. This technique, which is neither invasive nor destructive, is a good alternative to the conventional destructive methods.KEYWORDS: image analysis, moiré technique, poultry. ESTIMATIVA DIGITAL DA ÁREA SUPERFICIAL DE FRANGOS DE CORTE RESUMO:A área superficial (AS) de aves é um importante parâmetro nos cálculos de transferência de calor e massa. Aproximações ópticas, tal como a técnica de moiré (MT), são não destrutivas, o que resulta em ganhos de precisão e velocidade, e preservam a integridade do objeto. O objetivo desta pesquisa foi desenvolver e validar um novo protocolo para estimativa da AS de frangos de corte com base na MT. Sessenta e seis frangos da linhagem Ross (vinte e sete machos e trinta e nove fêmeas, com idades abrangendo toda a fase de criação) foram usados neste estudo. As dimensões (comprimento, largura e altura) e a massa corporal dos frangos de corte, aleatoriamente selecionados, foram avaliadas em laboratório. As aves foram iluminadas por uma fonte de luz, e grades foram projetadas sobre as aves para permitir que as suas formas fossem determinadas e gravadas. Em seguida, a pele e as penas das aves foram removidas para permitir que a AS fosse determinada da maneira convencional. Estas medições foram usadas para a calibração e a validação. A MT para análise de imagens foi confiável para avaliar a forma tridimensional e a AS de frangos de corte. Esta técnica, não invasiva e não destrutiva, é uma boa alternativa em relação aos métodos destrutivos convencionais.

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Sensitivity of the moiré technique for measuring biological surfaces

Cited by 14 publications

References 10 publications

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

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

The Efficiency of the Moiré Technique for Three-Dimensional Measures of Grape Bunches

Digital surface area assessment of broiler chickens

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