Two key techniques accounts the most for a human-face recognition system: one is face detection and orientation; the other is feature abstraction and recognition from unified human-face image.
人脸识别系统主要包括两个技术环节：首先是人脸检测和定位，然后是对归一化的人脸图像进行特征提取与识别。
Most of the fingerprint detection is first to enhance a fingerprint image referring to the fingerprint orientation, then to segment the fingerprint image.
指纹纹线检出大多是先按指纹方向图增强指纹图象，然后进行图象分割。
Most of the fingerprint detection is first to enhance a fingerprint image referring to the fingerprint orientation, then to segment the fingerprint image.
指纹纹线检出大多是先按指纹方向图增强指纹图象，然后进行图象分割。
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