几何特征最早用于人脸侧面轮廓的描述与识别，基本算法思想是首先根据侧面轮

Geometric features were first used to describe and recognize the profile of a human face. The basic algorithm idea is to first determine a number of salient points based on the profile curve, and then derive a set of feature metrics for identification (such as distance, angle, etc.) from these salient points.

Geometric features were first used for the description and recognition of face side contours, and the basic algorithmic idea is to first determine a number of significant points based on the side contour curve, and then derive a set of feature measurements (e.g. distance, angle, etc.) for recognition from these significant points.

Geometric features were first used for the description and recognition of facial profile. The basic algorithm thought is to determine some significant points according to the profile curve, and then derive a set of feature measures (such as distance, angle, etc.) for recognition from these significant points.<br>