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人脸68个特征点检测功能封装
参考：static/images/exp/face_68_feature.png
怎么实现：
1.图像处理工具：opencv 2.机器学习库：dlib 3.68个特征点预测模型：http://dlib.net/files/shape_predictor_68_face_landmarks.dat.bz2