On the Framework of Information Processing in a Hand Motion Based Shape Conceptualization System

In the computer support of conceptual design hand motions can be effectively used to express shapes and shape related operations. The development of these systems are challenging because of the special characteristics of conceptual design, such under-determinism, need of fast feedback and support of collaboration. This paper proposes a framework for information processing in a system, where a collaborating team of designers use hand motions to conceptualize shapes of various products. We separated the functions of the system into four groups: (1) data acquisition, where the hand motions are tracked as motion trajectories of dedicated joints of the hands and arms, (2) information completion, where the motion trajectories are processed and additional information is generated with the help of an upper limb model, (3) information conversion, where the motion trajectories are converted to surface information or shape manipulation operation and (4) visualization, where the generated surface is presented to the user. The modules of the system and the information flows were defined. A feasibility study was completed to qualify the alternative solutions for operational criteria. Measures were defined to describe the criteria and indices were created to enable a comparison. We concluded that (1) the criteria of each function should be fulfilled with regards to the final goal and (2) when multiple criteria are defined for each function, they may have an effect on each other, which has to be considered when selecting an optimal solution. Future research will focus on the software implementation of the proposed framework.Copyright © 2005 by ASME