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3. Recording and processing workflow

3.1 The 3-D object

The aim of the project was to develop a fully textured 3-D model of the objects. By a 3-D model we adopt the definition of Bernardini and Rushmeier (2002, 149).

By 3D model, we refer to a numerical description of an object that can be used to render images of the object from arbitrary viewpoints and under arbitrary lighting conditions. We consider models that can be used to simulate the appearance of an object in novel synthetic environments. Furthermore, the models should be editable to provide the capability of using existing physical objects as the starting point for the design of new objects in computer modeling systems. The geometry should be editable i.e. holes can be cut, the object can be stretched, or appended to other objects. The surface appearance properties should also be editable i.e. surfaces can be changed from shiny to dull, or the colors of the surface can be changed.

We would extend this definition to make it clear that accurate and properly registered surface texture (e.g. colour map) was of great importance and that capturing both range data (X, Y and Z values) and texture data can present increased processing and acquisition complexities (cf. Andreetto et al. 2004).

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