6533b835fe1ef96bd129fb70

RESEARCH PRODUCT

Automation of Acquisition and Post-processing for 3D Digitalisation

subject

description

The automation of digitalisation is an indispensable step in the development of 3D measuring, in various fields :- in industry, to accelerate the procedures for control of parts,- in archaeology and biology, for the study of collections of several hundreds even thousand objects (for which the acquisition is for the moment impossible because of necessary time, and thus of the cost). In this thesis, we explain first the various existing systems of acquisition and positioning, by detailing the advantages and the inconveniences of every system. We present then the developed methodology to guide the operator in these choices as well as the tool set up to formalize this methodology. Then we will study the necessity of the automation of the 3D digitalization by illustrating the limits and the constraints of the solutions in place at present. Some examples of application of the methodology are described through various case studies, highlighting the time of intervention of the operator. Then, existing methods for automating the acquisition are described, explaining their limits. Two methods are proposed : the first defines a off-line viewplanning from a reference model while the second calculates the next best position without any a priori information on the object. Both methods allow the complete digitalization of an object without intervention of an operator. To test these methods, a simulation environment and a prototype have been developed. Finally, the results are presented and compared to a manual digitalization.