对简单背景下和单脸的图片进行人脸检测；算法为欧式距离；计算出原图像与模板间的欧式距离；去最小的欧氏距离即为人脸-Face detection in simple background and single face image　algorithm for Euclidean distance　calculate the Euclidean distance between the original image and the template　the minimum Euclidean distance is the face