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