	US 11,972,628 B2
	Ultrasonic imaging device and method for image acquisition in the ultrasonic device
Hamed Bouzari, København Ø (DK); and Farzan Ghavanini, Mölndal (SE)
Assigned to FINGERPRINT CARDS ANACATUM IP AB, Gothenburg (SE)
Appl. No. 17/615,126
Filed by FINGERPRINT CARDS ANACATUM IP AB, Gothenburg (SE)
PCT Filed Jun. 1, 2020, PCT No. PCT/SE2020/050550 § 371(c)(1), (2) Date Nov. 30, 2021, PCT Pub. No. WO2020/251445, PCT Pub. Date Dec. 17, 2020.
Claims priority of application No. 1950681-5 (SE), filed on Jun. 10, 2019; and application No. 1950682-3 (SE), filed on Jun. 10, 2019.
Prior Publication US 2022/0237939 A1, Jul. 28, 2022
Int. Cl. G06V 40/13 (2022.01); G06F 3/043 (2006.01); G06F 3/044 (2006.01)

CPC G06V 40/1306 (2022.01) [G06F 3/043 (2013.01); G06F 3/044 (2013.01); G06F 2203/04106 (2013.01); G06F 2203/04108 (2013.01)]

6 Claims

1. A method for acquiring background data in an ultrasonic biometric imaging device, the method comprising:

detecting a finger in proximity of a touch surface of the imaging device;

determining a target area based on the detected finger;

before the finger makes contact with the touch surface, by a plurality of ultrasonic transducers arranged at a periphery of the touch surface, emitting an ultrasonic signal towards the target area;

by the ultrasonic transducers, receiving reflected ultrasonic echo signals defined by received radio frequency data (RF-data);

determining background RF-data based on the received reflected ultrasonic echo signals; and

detecting a finger in proximity of a touch surfaces of the imaging device is performed using a capacitive touch sensing element.