Coded visual markers for tracking and camera calibration in...

Details Coded visual markers for tracking and camera calibration in... Coded visual markers for tracking and camera calibration in...

2007-02-08

2010-10-05

Lu, Tom Y (Department: 2624)

Image analysis

Pattern recognition

Reexamination Certificate

active

07809194

ABSTRACT:
A method for determining a pose of a user is provided including the steps of capturing a video image sequence of an environment including at least one coded marker; detecting if the coded marker is present in the video images; if the marker is present, extracting feature correspondences of the coded marker; determining a code of the coded marker using the feature correspondences; and comparing the determined code with a database of predetermined codes to determine the pose of the user. According to an embodiment, the coded marker includes four color blocks arranged in a square formation and the determining a code of the at least one marker further includes determining a color of each of the four blocks. According to another embodiment, the marker includes a coding matrix and a code of the marker being determined by numbered squares of the coding matrix being covered by a circle.

REFERENCES:
patent: 5856844 (1999-01-01), Batterman et al.
patent: 6782119 (2004-08-01), Barlett
patent: 7526122 (2009-04-01), Usuda et al.

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