Abstract: Face detection is widely used in computer vision and pattern recognition.This paper proposes a fast face detection algorithm in video based on skin color detection and mosaic image.First，possible face area is obtained according to skin color and geometric formula of human face.Then improved mosaic image is used to locate precise face area from possible face area.The experiment results show that the algorithm can detect faces in video quickly and precisely.

Key words: face detection, skin color model, pyramid-like algorithm

摘要： 人脸检测广泛用于计算机视觉和模式识别领域。结合肤色检测和镶嵌图方法，提出一种对视频流中人脸进行快速检测的算法。该方法首先根据肤色信息和人脸的几何规则初步得到可能的人脸区，然后在候选区中利用改进的镶嵌图方法准确定位人脸。实验表明，该方法能快速而且准确地在视频流中进行人脸检测。

关键词: 人脸检测, 肤色模型, 类金字塔算法