Fuzzy freehand drawing system

摘要

Fuzzy logic has been applied to a drawing program so that a user can draw anything naturally, just like he is drawing on a real canvas with a pen. The Fuzzy Freehand Drawing System (FFDS) can infer human drawing intention and generate the corresponding geometric primitives and(or) smooth B-spline curves. FFDS is a pen-based real-time program. Based on drawing position and speed this information, FFDS establishes models to create fuzzy sets and computes fuzzy information for each individual point. Then FFDS uses inference rules to get rid of unintentional points and divide the curve into some subcurves, each of which might be in a basic geometric form. FFDS analyzes each subcurve under each assumed reference model and obtain the corresponding possibility for that model. Fuzzy inference rules are used to decide the correct model.