The basis of digital image processing: includes binarization, histogram, median filtering, etc.
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Preprocessing finishes the prophase job to make it easier to do the following recognizing work, which includes binarization, smoothness and refinement such image standardization operations.
预处理完成的是前期工作，对获取的待识别图像进行二值化、平滑、细化等图像规范化操作使得更易进行下步的识别操作。
The preprocessing in an automatic fingerprint identification system usually includes five steps: normalization, directional graph computation, image segmentation, filtering and binarization.
指纹预处理一般包括规格化、方向图计算、图像分割、滤波、二值化等环节，该文系统地讨论了各环节的有效算法。
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