中文说明：数据库是由10个人的7种正面表情组成的213幅灰度图像，图像是以大小为256256的8位灰度级存储的，格式为.tiff型，平均每个人每种表情有2到4张。
English Description：
The database is composed of 213 gray-scale images of 7 kinds of positive expressions of 10 people. The images are stored in 8-bit gray-scale with the size of 256256, and the format is. TIFF type. Each person has 2 to 4 images of each expression on average.