System for sensing an absolute position in two dimensions...

Details System for sensing an absolute position in two dimensions... System for sensing an absolute position in two dimensions...

2007-06-12

2007-06-12

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

Position or displacement

Position transverse to viewing axis

C356S420000, C356S421000

Reexamination Certificate

active

11112623

ABSTRACT:
A system for sensing an absolute position in two dimensions includes a target having a two-dimensional target pattern. A sensor captures an image of a first subset of the target pattern. A controller generates a first image vector representing summations of rows of pixel values from the image, and a second image vector representing summations of columns of pixel values from the image. The controller is configured to determine an absolute two-dimensional position of the first subset with respect to an origin of the target pattern based on the first and the second image vectors and a plurality of target vectors that represent the target pattern.

REFERENCES:
patent: 6781694 (2004-08-01), Nahum et al.
patent: 2002/0179826 (2002-12-01), Laberge et al.
patent: 2004/0218181 (2004-11-01), Jones et al.
patent: 2006/0022061 (2006-02-01), MacKenzie

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