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Function of "gazebo_ros_camera"?

Related to the answer to this question: http://answers.ros.org/question/192057/grab-single-frame-from-gazebo-camera/. I'm trying to write a C++ program that will allow me to capture a single frame from a camera in Gazebo and will be basing it on gazebo_ros_camera based on advice from that answer. Can someone explain to me what exactly is gazebo_ros_camera suppsoed to do? The source code documentation didn't really explain it, and the ROS wiki page only mentions it in passing in various places.

Function of "gazebo_ros_camera"?

Related to the answer to this question: http://answers.ros.org/question/192057/grab-single-frame-from-gazebo-camera/. I'm trying to write a C++ program that will allow me to capture a single frame from a camera in Gazebo and will be basing it on gazebo_ros_camera based on advice from that answer. Can someone explain to me what exactly is gazebo_ros_camera suppsoed supposed to do? The source code documentation didn't really explain it, and the ROS wiki page only mentions it in passing in various places.