基于Python语言和OpenCV实现了笑脸检测，首先进行人脸检测，然后在人脸检测的基础上进行笑脸检测。(This code implement smile detection based on OpenCV and Python. Face detection is done firstly and then smile detection is done based on the output face of the face detection.)

是关于Python-opencv使用的一些说明，可以作为补基础用。(it is about python-opencv and it is for readers who are lack of information about this era.)