| US 7,562,821 B2 | ||
| Position measurement system | ||
| Yasuji Seko, Kanagawa (Japan); Tsutomu Abe, Kanagawa (Japan); Yoshinori Yamaguchi, Kanagawa (Japan); and Hiroyuki Miyake, Kanagawa (Japan) | ||
| Assigned to Fuji Xerox Co., Ltd., Tokyo (Japan) | ||
| Filed on Feb. 14, 2006, as Appl. No. 11/353,011. | ||
| Claims priority of application No. 2005-241638 (JP), filed on Aug. 23, 2005. | ||
| Prior Publication US 2007/0045420 A1, Mar. 01, 2007 | ||
| Int. Cl. G06K 7/10 (2006.01) | ||
| U.S. Cl. 235—454 [235/435] | 9 Claims |
| 1. A position measurement system, comprising:
a plurality of concentric pattern projectors each for projecting a concentric pattern;
an image sensor that has a sensor plane and that detects the concentric pattern; and
an arithmetic unit that calculates a position of the image sensor and a normal direction of the sensor plane from a detection
signal of the image sensor.
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