A complete Human Face Recognition System should include Human Face Detection, Feature Extraction, and Match Recognition.

一个完整的人脸识别系统包括人脸检测、特征提取、以及匹配识别。

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Support, delivery and compositive distillation technique was first used to complete the extraction, separation and concentration of trace components.

探索一种新型的样品前处理装置，首次运用载体、携带体和综合蒸馏技术完成了待测样品中微量成分的提取分离和富集。

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Line patterns in palmprint are very complicated because of the low contrast and the heavy noise caused by fine wrinkles and ridges, so it is a challenging task to complete the feature extraction.

由于在线掌纹图象的对比度较低，掌纹中的细小皱纹和乳突纹会形成一定的噪声，掌纹中的线特征的模式十分复杂，因此对掌纹进行线特征提取是一项具有挑战性的研究课题。

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Negotiations over oil extraction and the pipeline are far from complete.

CNN: THE BIG OIL SHOCK