Invention Grant
US08417315B2 Marker systems with spaced apart surfaces or markers and methods of using the same 有权
具有间隔开的表面或标记的标记系统和使用它们的方法

Marker systems with spaced apart surfaces or markers and methods of using the same
Abstract:
A marker system includes a structure having a first surface and a second surface, a first marker located on the first surface, and a second marker located on the second surface, wherein the first marker and the second marker are arranged so that they face approximately a same direction, and so that they can be simultaneously viewed by an optical device, and wherein a first distance between the first marker and the optical device is different from a second distance between the second marker and the optical device when the first and the second markers are simultaneously viewed by the optical device.
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