FIG 12 is {TAIL ~ a flow diagram} of {HEAD ~ the routine} represented by the block 840 of FIG 8, for implementing thresholding, as previously described 
FIG 12 is { TAIL ~ a flow diagram } of { HEAD ~ the routine } represented by the block 840 of FIG 8 , for implementing thresholding , as previously described
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH