计算机图形学的 二维图形之曲线——蝴蝶结实验。该实验能画出蝴蝶结，动态静态都可以。-Two-dimensional graphics of computer graphics curves- Bow experiment. This experiment can draw a bow, can be dynamic static.

实现图片的sift特征的提取，并能够进行聚类，生成词典。并且附带详细的注释及说明。我们现在的图片有关sift的，都是使用此代码。绝对可用。对初学者和开发者都有很大的帮助。-Achieve the picture sift feature extraction and clustering can generate dictionary. And with detailed notes and instructions. We are now about sift pictures, are us