\subsubsection parameters ROS parameters

Reads and maintains the following parameters on the ROS server

- \b "~hue" : \b [double] Hue min: 0.0, default: 0.0, max: 1.0
- \b "~min_sat" : \b [double] Minimal saturation required min: 0.0, default: 0.5, max: 1.0
- \b "~min_val" : \b [double] Minimal intensity value required min: 0.0, default: 0.5, max: 1.0

