论文分析了AFIS图像数据与传输的矛盾，阐明了AFIS对图像数据压缩、图像预处理、图像分析与识别的需求。
This dissertation analyzes the antinomy between AFIS image data and transmission, clarifies the requirements of image compress, image process, image analysis and identification in the AFIS.
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。
It was composed of four modules: image preprocess, feature extraction, HMM-based training and word recognition.
在图像预处理阶段，我们主要是对手势字母图像进行平滑、锐化和二值化的处理。
In the process of image preprocessing there are several image operations such as image smooth, image sharpen and image segment.
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