本程序用到了opencv 中的扩展库opencv contrib, 先用take.cpp来获取自己的数据库，然后在用tria.cpp来训练能检测自己的脸的检测器，再运行recon.cpp来进行人脸检测。(This program uses the extension library opencv contrib in OpenCV. First, take.cpp is used to get its own database, then tria.cpp is used to train th