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I have not only used the accepted solution, but change the susbscriber type:

subscriber_=it.subscribeCamera("/sensors/camera/top/image_raw",1, &ImageReader::callbackSubscriber, this);
    publisher_ = it.advertiseCamera("camera/image", 1,false);

And my callback is now:

void ImageReader::callbackSubscriber(const sensor_msgs::Image::ConstPtr& msg,
                                     const sensor_msgs::CameraInfo::ConstPtr& camera_info)

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