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