说明：  BRISK算法是2011年ICCV上《BRISK:Binary Robust Invariant Scalable Keypoints》文章中，提出来的一种特征提取算法，也是一种二进制的特征描述算子。
(The BRISK algorithm is a feature extraction algorithm proposed in the article "BRISK: Binary Robust Invariant Scalable Keypoints" on ICCV in 2011. It is also a binary feature description operator.)