We describe a recursive algorithm that us- es quadratic algebraic curve segment to vectorize digital images. The closeness of fitting and the smoothness of connection between curve segments are ensured by a recursive algebraic curve fitting ad a sub- sequent fine-tuning procedure. The idea is to provide an alternative way to vectorize outside parametric schemes, while main- taining the precision of parametric vector- ization. We can also have all the new fea- tures of algebraic representation; for in- stance, the implicit forms and unique in- sights into curve shapes and control point weights.
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