关键词: 人脸检测, Haar-like特征, 肤色模型, 级联分类器, 强分类器, 弱分类器

Abstract: Dr Viola puts forward a fast face detection algorithm based on Haar-like features，which is promising.Though the research on it，it finds the algorithm still have two aspects to improve.Firstly，it’s difficult to give out a reasonable tradeoff between the detection rate and the false positive rate.Secondly，the face posture which can be detected depends on the training samples greatly.In the paper，it puts forward improving measures according Viola’s，and designs a face detection system which can detect the faces with an angle not more than ±45° compared with the upright.

Key words: face detection, Haar-like feature, skin model, cascade classifier, strong classifier, weak classifier