A Hand-painted Graphics Based On Bezier Curves

In computer animation molding, graphic curves design have not been well integrated with hand-painted. It is mainly because of that the accuracy of algorithm is imprecise in hand-painted fitting in curve design, the design model is too simple, the weakness in the Human-computer interaction, and the huge number of data points.These all brought about a great trouble in storaging and processing of data points. There have been some methods of fitting hand-painted curves, such as the use of polygon, arc approximation method separately, and the use of both polygon and arc approximation method. The common point is that they chose the points of the original curves as approaching polygon.Hand-painted curves are special digital curves. Comparing with the data points getting from the general pictures, they have thinner data points than that of the latters. However, they are both digital curves; there are many similarities to do with them. Hand-painted ways are used to get the curves (graphics), which make things convenient for some simulation tests, and contoured design. Unsatisfactorily, it is often more rough, more noisy, and is different from our's demand. Therefore, new ways are requested to deal with the hand-painted curves. This kind of ways can remove the noise, grasp the characteristics of the original curve, and have the less data points additionally.This article starts with the selection of data points, get the data points which are chronologically changed against some features such as drawing speed and the characteristics of the curves (such as the curvature). Based on the selected data points, the control points are chosen appropriately to draw the Bezier curves approaching the hand-painted curves. The control points derived by this way may not necessarily be on the original curves. The advantage is that it remove the noise, grasp the characteristics of the original curve, and have the less data points additionally.