In the process of image preprocessing there are several image operations such as image smooth, image sharpen and image segment.

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。

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Firstly, image segmentation is a process that segment image domain into a set of connected regions, each region having the same or similar features.

图像分割是将整个图像区域分割成若干个互不交叠的非空子区域的过程，每个子区域的内部是连通的，同一区域内部具有相同或相似的特征。

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