Image analysis – Image transformation or preprocessing – Changing the image coordinates
Patent
1997-09-25
1999-11-02
Au, Amelia
Image analysis
Image transformation or preprocessing
Changing the image coordinates
382287, 382291, 382295, G06K 932
Patent
active
059785217
ABSTRACT:
The invention provides improved machine vision methods for determining a calibration relationship among the imaging reference frames of multiple cameras (or other image acquisition devices) that acquire images of a common moveable object. The calibration relationship includes parameters for transforming positional coordinates among the camera's respective imaging reference frames. The method includes placing on the common object, stage, or belt a plurality of fiducials, e.g., calibration marks, that are at known positions relative to each other with respect to a frame of reference referred to as the "alignment reference frame"; aligning an axis of the alignment reference frame with an axis of the object's reference frame of motion, i.e., the reference frame in which the object, frame or belt moves; placing a respective fiducial in the field of view of each camera; determining a calibration relationship among the imaging reference frames of the respective image acquisition devices as a function of (i) the known relative locations of the fiducials (vis-a-vis the alignment reference frame), (ii) the fiducial calibrating positions determined for each camera (vis-a-vis that camera's acquisition reference frame), and (iii) the object calibrating positions determined for each respective image acquisition device (vis-a-vis the motion reference frame).
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Michael David J.
Wallack Aaron S.
Au Amelia
Cognex Corporation
Frederick, II Gilberto
Powsner David J.
Weinzimmer Russ
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