通过STM32F407驱动ov7620摄像头，并对采集的图像进行二值化，灰度化等处理，能识别出人脸，并将图像信息显示在3.4寸的液晶触摸屏上。(Through the STM32F407 driver OV7620 camera, and collect the image for two values, grayscale and other processing, can identify the face, and display the image information on the