The first one is improper image pre-processing, such as segmentation, normalization and thinning, which lose the features of letters relationship and strokes.
其一是图像预处理方法不当,在字符切分、大小归一化、倾斜校正以及签名图像的细线化时会丢失签名特征。
参考来源 - 离线签名验证技术的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
简要介绍了相干体技术和细线化技术。
In this paper, the coherence cube technology and graph thinning technology of image processing are introduced.
其一是图像预处理方法不当，在字符切分、大小归一化、倾斜校正以及签名图像的细线化时会丢失签名特征。
The first one is improper image pre-processing, such as segmentation, normalization and thinning, which lose the features of letters relationship and strokes.
指纹预处理一般包括以下几个步骤：图像质量评估、均值滤波、灰度归一化、灰度均衡化、方向滤波、二值化以及细线化。
Image preprocessing is usually consisted of following steps: quality assessment, mean filtering, gray normalization, gray equalization, the Oriental filtering, binarization as well as thinning.
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