Non-contact heart rate detection method

Abstract

The invention discloses a non-contact heart rate detection method. Firstly, chromaticity characteristics S1 (t) and S2 (t) of signals collected by a camera are calculated; pretreatment and extractionare carried out on each path of signals through the chromaticity characteristics S1 (t) and S2 (t) to obtain pulse signals h (t), h1 (t) and h2 (t); further blind source separation is performed on theextracted pulse signals h1 (t) and h2 (t) by adopting a FastICA algorithm; kurtosis values of power spectra of the pulse signals h (t), h1 (t) and h2 (t) are used as judgment of a blind source separation result; in addition, when the kurtosis values of the power spectra of the signals are close, only the selection signals with the kurtosis values prone to mistake are used, and the signal-to-noiseratio is used as an index, so that signal selection can be completed; therefore, noise interference caused by illumination change and non-autonomous movement of a subject can be effectively processed, a signal with lower noise is obtained, and the anti-interference performance and the measurement accuracy of detection are improved.

Description

technical field [0001] The present application relates to the technical field of signal processing, in particular to a non-contact heart rate detection method. Background technique [0002] Heart rate refers to the number of times the heart beats per minute. Modern medicine has found that for animals, the slower the heart rate is, the longer the life span is; the heart rate is an important indicator of physical health. At present, patch type is the most used clinically. The heart rate detector, which uses the heart rate extracted from the electrical signal of the human body, although the patch type heart rate detector has high precision, but because it must be in contact with the human body when used, it is difficult for certain groups of people, such as newborns. The heart rate monitoring of infants is very inconvenient; therefore, video-based non-contact heart rate detection has broad application prospects in the medical and health field, but this video-based non-contact h...

AI Technical Summary

Problems solved by technology

[0002]Heart rate refers to the number of times the heart beats per minute. Modern medicine has found that for animals, the slower the heart rate, the longer the life span; At present, the patch type heart rate detector is the most used clinically. This type of instrument uses the heart rate extracted from the human body electrical signal. It must be in contact with the human body, which causes great inconvenience to certain groups of people, such as the heart rate monitoring of newborn babies; Contact heart rate detection is susceptible to noise interference, such as changes in illumination, involuntary movement of the subject, etc., which makes it difficult to extract the signal effectively and will cause a decrease in the accuracy and stability of heart rate measurement. Therefore, a Heart rate detection method capable of anti-interference and improving measurement accuracy

Images