The contents in the paper include acoustic image preprocessing, feature extraction of texture and shape, and classifier design.

内容涉及声图像的预处理、纹理和形状特征的提取，以及分类器的设计等。

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It was composed of four modules: image preprocess, feature extraction, HMM-based training and word recognition.

该系统由图像预处理、特征提取、基于HMM的训练和识别四个模块组成。

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A personal identification system based on iris patterns is composed of iris image acquisition, image preprocessing, feature extraction and coding, matching and recognition.

基于虹膜的识别系统由以下几个部分构成：虹膜获取、虹膜图像预处理、虹膜图像特征提取、匹配与识别。

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