survey on content based medical image retrieval system it contains pre processing feature extraction and selection methods

对特征选择与提取进行介绍，及几个特征提取方法简介-For feature selection and extraction are introduced, and several feature extraction methods Introduction

The primary goal of pattern recognition is supervised or unsupervised classification. Among the various frameworks in which pattern recognition has been traditionally formulated, the statistical approach has been most intensively studied and used i

多变量评估系统的变量选择问题-变量选择介绍-An Introduction to Variable and Feature Selection