2. The method of claim 1 , wherein determining the best performing classifier set for the one or more historic time intervals comprises: for each of the one or more historic time intervals, applying a complete set of classifiers to a set of image queries received during the historic time interval; and determining the best performing classifier set for the historic time interval.
2. The method of claim 1 , wherein determining the best performing classifier set for the one or more historic time intervals comprises: for each of the one or more historic time intervals, applying a complete set of classifiers to a set of image queries received during the historic time interval; and determining the best performing classifier set for the historic time interval. 4. The method of claim 2 , wherein a current classifier set corresponds to an immediately previous minimum subinterval, further comprising calculating a potential performance gain for changing from the current classifier set to the best performing classifier set.