The paper extracts the text features based on a method of word co-occurrence frequency, which is related to the semantics of document.
本文基于词的同现频率的方法对文本的特征进行提取，涉及了文档的语义。
Similarly, the work of texture feature extraction is obtained by using co-occurrence matrix or frequency analysis based on wavelet transform depending on different characteristics of images.
在纹理特征提取方面，针对不同纹理特点分别采用了基于共生矩阵的统计纹理分析和基于小波变换的频谱纹理分析两种方法予以实现。
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