A method and system for providing virtual currency in a non-wagering game through activity in a wagering game includes non-wagering game terminals and wagering game terminals. An eddy current probe is movably installed in the recess, and a rod provided with a signal line for transmitting a signal detected by the eddy current probe, connected to the eddy current prove, is set up to be movable through a hole in a turbine casing and an air gap formed in the stationary blade diaphragm. After mapping the color values, the method determines which one or more region is associated with the most mapped color values and then selects that region for further analysis.