During recording, a plurality of consecutive image frames is separated into a plurality of {TAIL ~ groups}, in {HEAD ~ each} of which the image frames are intraframe or interframe compression coded to digital image information 
of
During recording , a plurality of consecutive image frames is separated into a plurality of { TAIL ~ groups } , in { HEAD ~ each } of which the image frames are intraframe or interframe compression coded to digital image information
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH