Periods and local direction of fingerprint image are the important structure characters. The two characters of structure are important in the fingerprint enhancement.

指纹图像的周期性和局部方向性是指纹图像的重要结构特征，充分利用这两个结构特征是提高指纹增强算法的重要方法。

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In order to preserve the local structure of the image space, locality preserving projection (LPP) is applied to palmprint recognition.

为了保持掌纹空间的局部结构，运用局部保持投影(LPP)方法进行掌纹识别。

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An improved region filling in painting method is proposed by using structure tensor that can successfully capture the local variations of an image.

借助结构张量具有表达图像局部结构的性质，提出一种改进的区域填充图像修补方法。

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