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Fix that:
my_node.param<std::string>("/source",source, "camera/rgb/image");
to (no "/"!)
my_node.param<std::string>("source",source, "camera/rgb/image");
If your my_node nodehandle is a private nodehandle, it will load the different private parameters.
Given that this looks like a parameter for a topic, there are probably better ways to do this that do not require loading parameters at all.