reading a colour (red) from live input

Hi there,

I would like to track multiple points of a colour (simultaneously) from a live (camera) input. What I mean is have a number of people individually showing say red cards or possibly balloons. I then want to be able to read the data from each of those cards and where it is in the x y axis.

Does that make sense?

I've been trying piecing together various parts of the tutorials but have had no luck so far

any help greatly appreciated

drew