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