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...

2007-05-24

2009-02-10

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

Optics: measuring and testing

Position or displacement

C356S616000

Reexamination Certificate

active

07489409

ABSTRACT:
A system for sensing an absolute two-dimensional position of an object having a two-dimensional target pattern thereon comprises a sensor and a controller. The sensor is for capturing an image of a subset of the target pattern. The controller is for generating 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 subset of the target pattern with respect to the origin of the target pattern based on the first image vector, the second image vector and target vectors that represent the target pattern.

REFERENCES:
patent: 6781694 (2004-08-01), Nahum et al.
patent: 2006/0022061 (2006-02-01), MacKenzie

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