{HEAD ~ A subject} is imaged at a predetermined time interval by {TAIL ~ a plurality} of imaging units which obtains a plurality of images having a parallax of a subject viewed from different viewpoints by imaging the subject from different viewpoints 
is imaged by
{ HEAD ~ A subject } is imaged at a predetermined time interval by { TAIL ~ a plurality } of imaging units which obtains a plurality of images having a parallax of a subject viewed from different viewpoints by imaging the subject from different viewpoints
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