Fuzzy spline interpolation and its application to online freehand curve identification

A technique called fuzzy spline interpolation is first introduced to handle curves which involve vagueness in their potential information. Then, the fuzzy spline curve identifier (FSCI), which performs online identification of free-hand curves based on the fuzzy spline interpolation technique, is proposed. FSCI identifies a freehand curve as a sequence of curve segments each of which is categorized into one of seven fundamental curve classes: line, circle, circular arc, ellipse, elliptic arc, closed free curve, or open free curve. Because FSCI uses fuzzy approaches and allows for vagueness in drawing, it works as a flexible and effective human interface for use with pen and tablet systems