Patent ID: 9697436
Date: 2017-07-04
CPC Classifications: F25D,G06K

Claim:
1. A method for selecting an image of an appliance with a suitable position or orientation of a door of the appliance: obtaining, by the controller, a digital RGB image from a camera of the appliance while the door of the appliance is opening, the camera positioned on the door of the appliance, the digital RGB image including a plurality of optical fiducials positioned on the appliance, each optical fiducial of the plurality of optical fiducials colored one of red, green, yellow and blue; converting, by the controller, the digital RGB image from said step of obtaining to a Lab color space in order to generate at least one of an A plane image or a B plane image from the digital RGB image, the A plane image is generated at said step of converting if one of the plurality of optical fiducials is red or green and the B plane image is generated at said step of converting if one of the plurality of optical fiducials is yellow or blue; calculating, by the controller, a normalized cross-correlation between a portion of the A or B plane images from said step of converting and a portion of a reference image, the door being at a reference position in the reference image, said step of calculating comprising calculating the normalized cross-correlation between a line of the A plane image from said step of converting and a line of the reference image if one of the plurality of optical fiducials is red or green and calculating the normalized cross-correlation between a line of the B plane image from said step of converting and the line of the reference image if one of the plurality of optical fiducials is yellow or blue; and saving, by the controller, the digital RGB image from said step of obtaining when a normalized cross-correlation factor from said step of calculating is greater than a predetermined value.