三大常用特征：HOG特征、LBP特征、Haar-like特征
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https://blog.csdn.net/juanjuan1314/article/details/50569841?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param
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