基于特征不变量的方法，实现速度比较快，但都只适用于某一类图像。
The Feature invariant approaches can detect the human faces fast, but only some kind of face can be detected.
给出了一种提取特征点的新方法和合理的特征不变量。
To proposes a new feature extraction method and reasonable feature invariants.
现有的静止图像人脸检测算法主要有四类：基于知识的方法、基于特征不变量的方法、基于模板匹配的方法和基于表象的方法。
The existing face detection methods can be classified into four categories: Knowledge-based methods, Feature invariant approaches, Template matching methods and Appearance-based methods.
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