error: 'Vec3b' was not declared in this scope

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error: 'Vec3b' was not declared in this scope [Copy link]

ubuntu 16.04 ros kinetic A program that receives camera signals. Error when compiling: 'Vec3b' was not declared in this scope Vec3b is in the namespace cv. You need to add using namespace cv; or, each time you use the content in the space, add cv::