inverse transforming {HEAD ~ the demultiplexed signals} to obtain {TAIL ~ image domain signals representative} of subsampled spatially offset frames; and 
to obtain
inverse transforming { HEAD ~ the demultiplexed signals } to obtain { TAIL ~ image domain signals representative } of subsampled spatially offset frames ; and
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH