\subsubsection parameters ROS parameters

Reads and maintains the following parameters on the ROS server

- \b "~blue" : \b [int] Blue threshold min: 0, default: 140, max: 255
- \b "~red" : \b [int] Bed threshold min: 0, default: 120, max: 255
- \b "~green" : \b [int] Green threshold min: 0, default: 190, max: 255
- \b "~draw_targets" : \b [bool] Draw Targets min: False, default: False, max: True

