US 12,144,655 B2
Method and device for liveness detection
Viacheslav Sergeevich Kholoburdin, Tambov (RU); Vladislav Valerievich Lychagov, Saratov (RU); Dmitrii Igorevich Chernakov, Cherepovets (RU); Kirill Gennadievich Beliaev, St. Petersburg (RU); and Dmitriy Alexandrovich Shelestov, Kotelniki (RU)
Assigned to Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Sep. 7, 2022, as Appl. No. 17/939,626.
Application 17/939,626 is a continuation of application No. PCT/KR2022/012274, filed on Aug. 17, 2022.
Claims priority of application No. 2021124869 (RU), filed on Aug. 23, 2021.
Prior Publication US 2023/0058966 A1, Feb. 23, 2023
Int. Cl. A61B 5/00 (2006.01); A61B 5/026 (2006.01)
CPC A61B 5/7221 (2013.01) [A61B 5/0261 (2013.01); A61B 5/7246 (2013.01); A61B 5/725 (2013.01); A61B 2562/0242 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A live subject tissue detection device, comprising:
a light source configured to emit light onto a tissue of a subject;
a photodetector configured to:
receive light reflected from the tissue of the subject and light reflected from blood flow of the subject, wherein the light reflected from the blood flow of the subject has a Doppler shift relative to the light reflected from the tissue of the subject, and
generate a high frequency Doppler signal based on the Doppler shift; a detection circuitry configured to:
receive the high frequency Doppler signal from the photodetector, and
convert the high frequency Doppler signal into a low frequency signal; and
at least one processor configured to:
compute parameters of the low frequency signal,
compare the parameters of the low frequency signal to respective reference values, and
determine a presence of live subject tissue based on the comparison,
wherein the comparing of the parameters of the low frequency signal to the respective reference values comprises splitting the low frequency signal into a plurality of spectral bands and comparing signal power levels in each of the plurality of spectral bands with the respective reference values.