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 d