Patent ID: 9519810
Filing Date: 2016-12-13
CPC Classification: G06K,G06T

Claim Text:
1. A method of calibrating position and orientation parameters of an imaging system in an automated data reading system, the automated data reading system including an optical code decoder system configured to decode first optical codes when the first optical codes are detected from items in response to the items being transported through a read zone established by the imaging system, the method comprising: obtaining, from the imaging system, image data representing an imaged portion of a planar calibration target that is superimposed in the read zone on a surface of the automated data reading system, the imaged portion of the planar calibration target including spaced-apart second optical codes disposed at predetermined positions on a surface of the automated data reading system to define known locations of calibration-control points on the surface, the second optical codes each including multiple modules of contrasting colors positioned according to an optical code symbology to encode information based on a spatial arrangement of the multiple modules; providing the image data to the optical code decoder system to determine an observed location of a calibration-control point from each one of the second optical codes based on the spatial arrangement of the multiple modules to establish from the second optical codes observed locations of the calibration-control points represented by the image data; and calibrating position and orientation parameters of the imaging system based on differences between the known and observed locations of the calibration-control points.