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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本文对签名信息入行去噪、方向归一化等预处置，去除原始采集数据中的干扰或无用信息，将采集的数据变成相宜于特性提取的形式。

The usefulness information is removed from the original signature information by pretreatment and the signature data is converted to a form suitable for extracting the signature features.

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本文首先对手写数字图像的图像灰度化、二值化、去噪、细化、归一化、特征提取等预处理过程进行分析；

This paper analyse the image enhancement, the binarization, the noise abatement, the thinning, the normalization and the feature extraction on the handwritten digit recognition.

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