LVIS (pronounced ``Elvis ) from Princeton Video Image (PVI ) [7] . It uses various methods , including instrumented cameras , a vision-based tracking system and pattern recognition , to position the advertisement , then modifies the video as it is broadcast . An example is shown in Figure 4 . Figure 4 : Virtual advertising . From : [7] The Head-Up Display (HUD ) in many military aircraft overlays graphics showing the horizon , the instantaneous flight path , and the locations of tracked targets over the real world , in addition to information such...











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