3D apple modeling with the use of the structured light method

The geometrical fruit model could affect many physical phenomena, such as heat, mass and moisture transfer, pneumatic transport and mechanical vibrations which occur during handling and processing fruits (Jancsok, 1999). The fruit geometrical model could be further studied by the Finite Element Method (FEM) (Jancsok, 1999). Incidence of bruises is the most important type of postharvest mechanical injury (van Zeebroeck, 2005). The reason for this is that the causes and mechanisms of impact and vibration are complex and interrelated (van Zeebroeck, 2005). In mechanical engineering a geometrical model of the structure to be analyzed is usually available as CAD drawing which can be imported directly in FE software (Jancsok, 1999). However, for agricultural-, bio- and food- materials there are no geometrical models available so they have to be defined manually, which is complicated by the complex shape and the shape variability of these products (Jancsok, 1999). Dintwa (Dintwa, 2006) stated that the 3D simplified models used in the dynamic experiments were not accurate enough, most certainly because of the coarse discretization used with these models. This paper describes a system for complex shapes geometrical modeling. The system was implemented in real apple modeling. It was developed on structured light method elaborated by Sitnik (2002). The method has advantages and disadvantages. Advantages: modeling of complex shapes, recalculation of many points at one moment, at least only 3 views for one figure, measurements without object touching. Disadvantages: problems with light reflection.