一个基于VB.NET开发的中文分词及关键词提取系统，采用双向最大匹配、词频统计、快速排序等算法实现。-VB.NET developed based on Chinese word segmentation and Key Extraction System, the largest two-way matching, word frequency statistics, such as quick sort algorithm.

金字塔匹配算法，包括SIFT特征点的提取，聚类和构造金字塔特征表示，论文参考：Beyond Bags of Features: Spatial Pyramid Matching for Recognizing Natural Scene Categories matlab代码

mfcc的特征提取算法-feature extraction