obtaining quantized {HEAD ~ two dimensional image data} including {TAIL ~ an object} to be in focus with respect to an optical system by imaging the object through the optical system 
including
obtaining quantized { HEAD ~ two dimensional image data } including { TAIL ~ an object } to be in focus with respect to an optical system by imaging the object through the optical system
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH