ftp://ftp.ics.uci.edu/pub/machine-learning-databases
https://www.ece.rice.edu/~wakin/images/
https://blog.youkuaiyun.com/duan19920101/article/details/50679061
https://www.ece.rice.edu/~wakin/images/
https://blog.youkuaiyun.com/duan19920101/article/details/50679061