error: ‘Vec3b’ was not declared in this scope

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error: ‘Vec3b’ was not declared in this scope [复制链接]

ubuntu 16.04 ros kinetic
接收摄像头信号的程序。
编译出现error: ‘Vec3b’ was not declared in this scope
Vec3b  在命名空间cv下。需要添加using namespace cv;
或者，每次用到空间中内容时，前面加cv::