In (a), the distortion affects the coordinate system calculated from the patterns, which is necessary to represent the relative position relationship between the TV and the mobile device. The system affects a complementary time marker placed in the system. In (b), since the complementary time marker with no distortion is overlaid on the captured picture with the distortion, the distortion directly affects synchronization accuracy. In
general AR system, a lens distortion is corrected by the software processing to reduce the affection of (a).