US 11,704,928 B1
Force-based finger detection for fingerprint sensor systems
Raj Kumar, San Diego, CA (US); Mohamed Ahmed, San Marcos, CA (US); Kritpal Singh Dhindhsa, Hyderabad (IN); Deepak Rajendra Karnik, San Diego, CA (US); and Seong Jun Ma, San Diego, CA (US)
Assigned to QUALCOMM Incorporated, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Feb. 17, 2022, as Appl. No. 17/651,540.
Int. Cl. G06V 40/13 (2022.01); G06F 3/041 (2006.01); G06F 21/32 (2013.01)
CPC G06V 40/1306 (2022.01) [G06F 3/0412 (2013.01); G06F 21/32 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A method of controlling a fingerprint sensor system, the method comprising:
receiving a contact indication corresponding to a contact of an object with a surface of an apparatus;
determining multiple force values corresponding to the contact of the object with the surface during a force monitoring time interval;
determining whether at least a plurality of the multiple force values exceeds a force threshold;
determining whether the plurality of the multiple force values matches a digit touch force pattern;
responsive to determining that the plurality of the multiple force values exceeds the force threshold and matches the digit touch force pattern, controlling the fingerprint sensor system to initiate a fingerprint sensor scan;
estimating, based at least in part on fingerprint image data associated with the fingerprint sensor scan, whether the object is a digit; and
initiating fingerprint image data processing functionality responsive to estimating that the object is a digit.