A defocusing mechanism defocuses {HEAD ~ the first color component signal} based on {TAIL ~ the filtered first color component signal} 
A defocusing mechanism defocuses { HEAD ~ the first color component signal } based on { TAIL ~ the filtered first color component signal }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL