US 11,694,480 B2
Method and apparatus with liveness detection
Solae Lee, Suwon-si (KR); Youngjun Kwak, Seoul (KR); Sungheon Park, Suwon-si (KR); Byung In Yoo, Seoul (KR); Yong-Il Lee, Suwon-si (KR); Hana Lee, Suwon-si (KR); Jiho Choi, Seoul (KR); and Jaejoon Han, Seoul (KR)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on May 6, 2021, as Appl. No. 17/313,437.
Claims priority of application No. 10-2020-0093137 (KR), filed on Jul. 27, 2020; and application No. 10-2020-0178770 (KR), filed on Dec. 18, 2020.
Prior Publication US 2022/0027649 A1, Jan. 27, 2022
Int. Cl. G06V 40/40 (2022.01); G06V 10/30 (2022.01); G06V 40/16 (2022.01); G06T 5/00 (2006.01); G06T 5/20 (2006.01)
CPC G06V 40/45 (2022.01) [G06T 5/003 (2013.01); G06T 5/20 (2013.01); G06V 10/30 (2022.01); G06V 40/161 (2022.01); G06T 2207/20084 (2013.01); G06T 2207/30201 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A processor-implemented method with liveness detection, comprising:
receiving a plurality of phase images of different phases, captured by a multi-phase detection image sensor;
generating a plurality of preprocessed phase images by performing preprocessing, including edge enhancement processing, on the plurality of phase images of different phases;
generating a plurality of differential images based on a result of determining a respective difference in pixel values between the preprocessed phase images;
generating a plurality of low-resolution differential images having lower resolutions than the differential images, based on a result of reducing a respective size of the differential images;
generating a minimum map image based on the low-resolution differential images, the minimum map image representing a minimum difference value among difference values between the low-resolution differential images; and
performing a liveness detection on an object in the phase images based on the minimum map image.