US 11,657,644 B2
Automatic ruler detection
Darrell Hougen, Littleton, CO (US); and Peter Zhen-Ping Lo, Mission Viejo, CA (US)
Assigned to IDEMIA IDENTITY & SECURITY USA LLC, Billerica, MA (US)
Filed by IDEMIA IDENTITY & SECURITY USA LLC, Billerica, MA (US)
Filed on Jun. 8, 2020, as Appl. No. 16/895,493.
Application 16/895,493 is a continuation of application No. 16/222,755, filed on Dec. 17, 2018, granted, now 10,679,094.
Application 16/222,755 is a continuation of application No. 14/942,417, filed on Nov. 16, 2015, granted, now 10,192,137, issued on Jan. 29, 2019.
Prior Publication US 2021/0124978 A1, Apr. 29, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G06K 9/52 (2006.01); G06T 7/60 (2017.01); G06V 10/42 (2022.01); G06V 10/32 (2022.01); G06V 40/12 (2022.01); G06V 10/44 (2022.01)
CPC G06V 10/42 (2022.01) [G06T 7/60 (2013.01); G06V 10/32 (2022.01); G06V 40/1347 (2022.01); G06T 2207/30204 (2013.01); G06V 10/44 (2022.01); G06V 2201/02 (2022.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
obtaining an edge candidate group within an orientation map of an image that includes a fingerprint and a mensuration reference device, wherein edge pixels of the edge candidate group have a matching orientation;
identifying a set of regularity characteristics of the edge candidate group within the orientation map of the image that includes the fingerprint and the mensuration reference device;
determining that the set of regularity characteristics match a set of reference regularity characteristics associated with the mensuration reference device;
predicting a set of ruler marks from the edge candidate group based on the determining that the set of regularity characteristics match the set of reference regularity characteristics associated with the mensuration reference device; and
providing the set of ruler marks for output.