US 12,156,722 B2
Pulse rate detection device and pulse rate detection program
Michael Jones, Tokyo (JP)
Assigned to AISIN CORPORATION, Kariya (JP)
Appl. No. 17/600,008
Filed by AISIN CORPORATION, Kariya (JP)
PCT Filed Mar. 27, 2020, PCT No. PCT/JP2020/014360
§ 371(c)(1), (2) Date Sep. 29, 2021,
PCT Pub. No. WO2020/203912, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-066379 (JP), filed on Mar. 29, 2019.
Prior Publication US 2022/0104717 A1, Apr. 7, 2022
Int. Cl. A61B 5/024 (2006.01); A61B 5/00 (2006.01)
CPC A61B 5/02405 (2013.01) [A61B 5/0077 (2013.01); A61B 5/02416 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A pulse rate detection device comprising:
a moving image obtaining means configured to obtain a moving image captured by photographing a body surface of a subject;
a pulse rate obtaining means configured to obtain a pulse rate of the subject on the basis of change of a pixel value of the body surface in the moving image;
a reliability obtaining means configured to obtain reliability of the obtained pulse rate;
a processor that is configured to determine: (1) if the obtained reliability is equal to or greater than a first predetermined reliable criteria and (2) if the obtained reliability is less than the first predetermined reliable criteria and is equal to or greater than a second predetermined reliable criteria that is less than the first predetermined reliable criteria and that a difference between the obtained pulse rate and an immediate past pulse rate is equal to or less than a predetermined reference; and
an output means configured to output the obtained pulse rate, wherein:
the output means outputs the obtained pulse rate when the processor determines that the obtained reliability is equal to or greater than the first predetermined reliable criteria, or
the output means outputs the obtained pulse rate when the processor determines that the obtained reliability is less than the first predetermined reliable criteria and is equal to or greater than the second predetermined reliable criteria that is less than the first predetermined reliable criteria and the difference between the obtained pulse rate and the immediate past pulse rate is equal to or less than the predetermined reference,
wherein:
the pulse rate obtaining means obtains the pulse rate from a pulse rate peak in a frequency domain of the obtained moving image, and
the reliability obtaining means obtains the reliability on the basis of a signal-to-noise (SN) ratio of the obtained pulse rate.