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中文摘要：
现有的椭圆窗口裁剪算法需通过求交运算确定裁剪对象，算法复杂，而且只适用于简单图形的裁剪。由于裁剪是计算机图形学中基础算法之一，因此找到一种高效的椭圆窗口裁剪算法具有重要的实际意义。提出了一种基于像素的椭圆窗口裁剪算法，首先采用高效的椭圆算法生成裁剪窗口，然后以窗口作为边界利用扫描线原理确定窗口内像素并输出，完成裁剪过程。该方法无需复杂的求交运算，只需简单的像素读写便可完成裁剪操作，因此裁剪过程简单，执行速度快，算法复杂度低，尤其适合于复杂图形及图像的裁剪处理。
英文摘要：
Existing ellipse clipping algorithms determine clipping objects through complicated steps of calculating cross-points which is complex and only suitable for simple graphics clipping. Because dipping is one of basis algorithms in computer graphics, it is necessary to find out a high-efficiency clipping algorithm based on ellipse window. A new clipping algorithm based on ellipse window is proposed, which can efficiently clip arbitrary graphics and images. Firstly, a clipping window is generated through a high-quality ellipse algorithm. Then, pixels in the window is scanned and output through scan-line principle. At last, clipping process is finished. The method has advantages of simple design, fast implementation and low complieacy which is more suitable for clipping complicated graphics and image.
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