{HEAD ~ The stationarity} of the training image is preferably characterized by {TAIL ~ statistical measures} of orientation stationarity, scale stationarity, and category distribution stationarity 
is preferably characterized by
{ HEAD ~ The stationarity } of the training image is preferably characterized by { TAIL ~ statistical measures } of orientation stationarity , scale stationarity , and category distribution stationarity
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH