US 12,450,779 B1
System for detecting corners of an optical tag
Lorenzo Sorgi, Berlin (DE)
Assigned to AMAZON TECHNOLOGIES, INC., Seattle, WA (US)
Filed by AMAZON TECHNOLOGIES, INC., Seattle, WA (US)
Filed on Nov. 13, 2024, as Appl. No. 18/946,239.
Application 18/946,239 is a division of application No. 17/936,839, filed on Sep. 29, 2022, granted, now 12,217,461.
Int. Cl. G06T 7/90 (2017.01); G06K 7/14 (2006.01); G06K 19/06 (2006.01); G06T 7/13 (2017.01); G06T 7/73 (2017.01)
CPC G06T 7/90 (2017.01) [G06K 7/1417 (2013.01); G06K 19/06037 (2013.01); G06K 19/0614 (2013.01); G06T 7/13 (2017.01); G06T 7/73 (2017.01); G06K 2019/06225 (2013.01); G06T 2207/10024 (2013.01); G06T 2207/30244 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
acquiring, using a camera of a device, image data;
detecting a first gradient feature that transitions from a first color to a second color in the image data;
determining a first edge proximate to the first gradient feature;
determining a second edge proximate to the first gradient feature; and
determining a first corner of a tag based on gradient values determined for pixels of the image data proximate the first edge, the second edge, and the first gradient feature;
wherein the first gradient feature is external to the tag.