Freehand drawing system using a fuzzy logic concept

A pen-based drawing system using a fuzzy logic concept has been developed. The Fuzzy Freehand Drawing System (FFDS) can infer human drawing intentions and generate the corresponding geometric primitives and smooth B-spline curves. FFDS is a pen-based real time drawing system. On the basis of drawing position, speed, and acceleration information, FFDS establishes geometric primitives. Unintentional points are eliminated using fuzzy filtering rules. FFDS analyses the drawn curve with reference models, and obtains the corresponding possibilities. Fuzzy inference rules are used to recognize the correct model. Finally, the correct geometric primitives are drawn automatically.