下载人脸样本，训练自己分类器

参考： https://blog.csdn.net/hongbin_xu/article/details/74203215 opencv_createsamples.exe -vec pos.vec -info posdata\pos.txt -bg negdata\neg.txt -w 20 -h 20 -num 10000;opencv_haartraining.exe -vec pos.ve

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