（1）图像预处理：包括输入、输出、显示、缩放等，以及图像的腐蚀、膨胀，图像校正，亮度及对比度调节，光照补偿，色彩平衡等；（2)人脸检测功能，并对检测出的人脸进行标记。-(1) Image preprocessing: includes input, output, display, zoom, and image of the erosion, dilation, image correction, brightness and contrast adjustment, illumination