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图像的预处理是后续图像处理的基础。
Preprocess of image is the base of following image processing.
研究磨粒图像的预处理方法和磨粒形态特征的提取方法；
The method about pretreatments of debris image and extracting morphologic characters of wear particles is studied.
虹膜图像的预处理包括虹膜图像的定位、归一化、增强和去噪。
It is composed of iris localization, iris normalization, iris image enhancement and denoising in image preprocessing.
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