Blood pressure detection method and terminal for extracting pulse wave based on video

Abstract

The invention provides a blood pressure detection method for extracting pulse waves based on videos and a terminal. The method comprises the steps that parameters of a nonlinear blood pressure calculation model are initialized; using a camera to shoot videos of neck and facial artery pulsation regions of the subject; amplifying a weak neck artery pulse signal and a weak facial artery pulse signal in the two regions by using a motion amplification technology; respectively selecting neck and facial artery pulsation point regions with obvious pulsation, and calculating to obtain pulse wave conduction time between the two point regions; a nonlinear blood pressure calculation model is adopted, and the average blood pressure value of the subject in the shooting time is obtained through calculation. According to the method, the neck and facial artery regions are collected through the camera, the pulse wave conduction time of the neck and facial artery pulsation points is obtained through signal amplification extraction and calculation, finally, the blood pressure value is obtained through calculation in combination with a nonlinear blood pressure calculation model, and non-invasive, non-contact and non-inductive blood pressure measurement is achieved while time delay errors are avoided.

Description

technical field [0001] The invention relates to the fields of biomedicine and digital image processing, in particular to a blood pressure detection method based on video extraction of pulse waves and a terminal. Background technique [0002] Blood pressure is a very important physiological parameter of the human body. Most of the blood pressure detection technologies and instruments on the market are based on invasive, contact and non-continuous applications. However, the current clinically based invasive blood pressure detection is potentially harmful to the human body, and it is not easy to operate and the steps are cumbersome; the sphygmomanometer used in daily health assessment and hospital physical examination is a contact measuring instrument, and the measurement method of cuff pressure will increase the impact on the human body. The measurer feels uncomfortable, the convenience is low, and the change of blood pressure cannot be continuously monitored. [0003] Since ...

AI Technical Summary

Problems solved by technology

[0004] At present, the measurement of pulse wave transit time often adopts two-way pulse wave signal acquisition method, such as placing PPG sensors from the brachial artery and finger artery to obtain pulse wave signal and pulse wave transit time. This method does not need to obtain ECG signal, avoiding the The delay error caused by the isovolumic contraction period, but it cannot avoid the limitation of the contact between the sensor and the human body, and the movement of the body will cause the distance between the sensors to change, which has a greater impact

Images