HortShape: a tool for generating 3D geometrical models of horticultural products

S. Rogge, T. Defraeye, M. van Dael, P. Verboven, B.M. Nicolaï
In numerical simulations of heat and mass transport within plant organs and their exchange with the environment, for example with finite element modelling or computational fluid dynamics, the shape of the studied object plays a crucial role. HortShape is a tool that has been developed to generate accurate 3D geometrical models of the outer surface of horticultural products, which can serve as a direct input for these numerical simulations. The generated geometries are based on shape description and statistical analysis of a dataset of 3D shape information of horticultural products, obtained from non-destructive imaging, for example using X-rays. The outputs of the generator are geometrical models with random variations that reflect the actual biological variation as was observed in reality. This allows inclusion of the impact of biological variability into the numerical simulations. The high accuracy of the model generator lies in its shape description algorithm, which is based on a 2D Fourier series expansion. This 2D description method is able to capture all shape features of the outer contour of the product up to 99% accuracy, for various kinds of fruit. Once calibrated for a certain horticultural product, based on imaging data, HortShape can generate very quickly a large set of high-quality geometrical models of the product of interest, which can be directly imported into computational modelling software.
Rogge, S., Defraeye, T., van Dael, M., Verboven, P. and Nicolaï, B.M. (2017). HortShape: a tool for generating 3D geometrical models of horticultural products. Acta Hortic. 1160, 5-10
DOI: 10.17660/ActaHortic.2017.1160.2
CAD models, shape description, Fourier descriptors, biological variability, virtual fruit

Acta Horticulturae