用于人脸检测的不同尺寸，不同背景的脸部正面灰度图像,来源于卡内基梅隆,麻省理工大学，绝对的人脸正面识别给力数据库-Face detection for different sizes, different backgrounds, face the positive gray-scale image, from Carnegie Mellon, MIT, absolutely positive identification of human face to force the database!