https://blog.wongcw.com/2018/12/04/%e6%b5%b4%e9%9c%b8%e6%84%9f%e5%8f%97%e4%b8%8b%e8%ab%be%e5%9f%ba%e4%ba%9e9-pureview%e4%bf%9d%e8%ad%b7%e7%9a%ae%e5%a5%97%e6%9b%9d%e5%85%89/