原博客搬移到：https://blog.csdn.net/u013171226/article/details/108062603
某項目中opencv版本由opencv3更換為opencv4之后，之前的代碼編譯出錯，
error: ‘CV_BGR2GRAY’ was not declared in this scope
這是由於版本更新，宏定義發生了改變。
修改方法為：將CV_BGR2GRAY改為cv::COLOR_BGR2GRAY
error: ‘CV_BGR2GRAY’ was not declared in this scope
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