The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 05, 2016
Filed:
Dec. 31, 2012
Gang Liu, Natick, MA (US);
Gang Liu, Natick, MA (US);
COGNEX CORPORATION, Natick, MA (US);
Abstract
This invention provides a system and method for automatic (non-manual) calibration of one or more cameras employs a tessellating calibration plate having a checkerboard tile pattern and a plurality of 2D codes embedded within the checkerboard pattern. Each 2D code encodes the (X,Y) coordinates that identify tile calibration feature locations in the pattern, and the remaining, surrounding tiles allow measurement of the corner positions as calibration features. One or more vision system camera(s) can be calibrated to a single coordinate system automatically. During calibration, an image of at least a portion of a calibration plate is acquired, the encoded data is decoded for at least one 2D code within the field of view of each camera and then the position of the field of view is determined on the calibration plate for each camera using the 2D code data and the checkerboard tile pattern.