Interactive freehand sketch interpreter for geometric modelling

This paper presents a new method to deal with idea sketches for inputting geometric models at a workstation. The idea sketches are drawn on a CRT screen with a stulus pen and a tablet by designers at an initial stage of design procedures. They can keep their drawing styles at a workstation as the same manner as using a pen on paper. The system 'Sketch Interpreter1 can create correct geometric models in a computer even though input idea sketches are incorrect perspectively. Data created are transferred to an advanced 3D-CAD system. The system is applied as a front-end processer for a design practice.