Robust method for finding registration marker positions

Details Robust method for finding registration marker positions Robust method for finding registration marker positions

1998-03-30

2000-10-31

Johns, Andrew W.

Image analysis

Image transformation or preprocessing

Measuring image properties

G06K 936

Patent

active

061414646

ABSTRACT:
A method and system for detecting registration markers having the shape of an `X` on a scanned test target used to calibrate an image processing system. The procedure is impervious to scanning and printing distortion. A captured image is converted to a binary image and then segmented into a list of eight-connected components. A set of features is extracted from each component in the list. An accurate decision rule is executed on each component. If a component is found to be a marker, its centroid is returned as its position.

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