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A Nested Marker is a novel visual marker for HMD calibration in Augmented Reality. It enables to keeping accurate calibration even when the observer is moving very close to and far away from the marker. Our proposed Nested Marker has a recursive layered structure. One marker at an upper layer contains four smaller markers at the lower layer. The smaller markers can also have lower-layer markers nesting inside them. Each marker can be identified by its inside pattern, so the system can select adoi:10.1109/vr.2007.352495 dblp:conf/vr/TatenoKO07 fatcat:c5yyemvv35fuzkeayoerucv73q