基于投影法实现矩形窗口的任意曲线裁剪

Random Clipping of Curves in Rectangular Windows Based on the Projection Method

对含有任意曲线的图像进行二值化后,针对某一矩形区域,对曲线上的点进行水平和垂直投影,投影后若在该矩形区域内(窗口内),给予显示;否则在窗口外,裁剪掉(即不显示).该方法能动态的定义矩形窗口大小,能对任意规则曲线(如圆)和不规则曲线(如Bezier曲线、B样条曲线)进行裁剪.该方法简单、高效.

Images with curves are binarized, and then horizontal and vertical projections are done to the points of the curves to a certain rectangular window. It aims to test whether the points are inside the rectangular region （or inside the window） or not after the projections. If they are inside the window, they should be displayed, otherwise, they should be clipped （ not to be displayed）. In this way the size of the rectangular window can dynamically be defined, and clipping can be done to any regular curves （for example, circles） or irregular curves （for example, Bezier curves, B - Spline curves）. This method is simple and efficient .