A method and apparatus implementing a technique for entering a representation of a desired curve into a computer. In one aspect, the technique includes receiving an ordered sequence of points representing the desired curve as input. The points of the sequence of points are grouped into one or more contiguous...http://www.google.com.tw/patents/US6304677?utm_source=gb-gplus-share專利 US6304677 - Smoothing and fitting point sequences
