reading a colour (red) from live input

    Jul 01 2013 | 6:01 am
    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