公开(公告)号：US20220031191A1

公开(公告)日：2022-02-03

申请号：US17026288

申请日：2020-09-20

Applicant: NATIONAL YUNLIN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Chuan-Yu CHANG ,  Min-Hsiang CHANG

IPC: A61B5/08 ,  A61B5/1171 ,  A61B5/00

Abstract: A contactless breathing detection method is for detecting a breathing rate of a subject. The contactless breathing detection method includes a photographing step, a capturing step, a calculating step, and a converting step. The photographing step is performed to provide a camera to photograph the subject to generate a facial image. The capturing step is performed to provide a processor module to capture the facial image to generate a plurality of feature points. The calculating step is performed to drive the processor module to calculate the feature points according to an optical flow algorithm to generate a plurality of breathing signals. The converting step is performed to drive the processor module to convert the breathing signals to generate a plurality of power spectrums, respectively. The processor module generates an index value by calculating the power spectrums, and the breathing rate is extrapolated from the index value.