The emphasis and difficulty lie in how to extract characteristic of signal efficiently, that is, the problem of seeking classification criteria.
其重点与难点在于如何有效的提取信号中的特征量，即分类标准的找寻问题。
The border shape of skull is taken as identification target, extract characteristic depend on different algorithms, analyze and compare the result of different experiments.
以颅骨边界形状为识别对象，运用不同的算法进行特征提取，并结合实验结果对不同算法进行了分析比较。
The key of identify recognition on the use of hand vein characteristic, is how to effectively extract the structure of the hand vein image.
利用手背静脉特征进行身份识别的关键是如何有效地提取手背静脉纹理的骨架。
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