ROS的cv_bridge的问题

https://blog.csdn.net/u013832707/article/details/72636602
https://www.cnblogs.com/cv-pr/p/5366764.html
https://blog.csdn.net/bigdog_1027/article/details/79092263

https://answers.ros.org/question/262329/how-to-install-cv_bridge/
(最后还是用这个解决的！原来我就没有装cv_bridge)