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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
The Efficiency of the Moiré Technique for Three-Dimensional Measures of Grape Bunches
Author(s)
Juliana Aparecida Fracarolli1, Kátia Cristina Suzigan2 and Inácio Maria Dal Fabbro3
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DOI:10.17265/2161-6264/2016.04.004
Affiliation(s)
1. Department of Postharvest Technology, School of Agricultural Engineering, University of Campinas, Campinas 13083-875, SP, Brazil
2. Department of Pre-processing Agricultural Products, School of Agricultural Engineering, University of Campinas, Campinas 13083-875, SP, Brazil
3. Department of Farm Machinery, School of Agricultural Engineering, University of Campinas, Campinas 13083-875, SP, Brazil
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 Xi 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 Xi 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.
KEYWORDS
Vitis vinifera L., grape bunches, Moiré technique, three-dimensional visualization.
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