Non-contact Blood Pressure Measurement Based On IPPG

Every person’s health state includes two aspects,including not only physical health,but also mental health.Physiological health needs to be reflected by various physiological indexes,such as blood pressure,heart rate,oxygen saturation,respiration rate and other basic human life indicators for daily physical detection.With the continuous development of human society and the continuous improvement of science and technology.The quality of life and habits also change,which also leads to the gradual increase in the incidence of various diseases.The incidence of central cerebrovascular diseases is significantly increased,and hypertension is one of them.Blood pressure is an important body indicator that reflects the basic vital signs of each person.It must be monitored at all times no matter in daily health monitoring,medical examination,clinical operation,etc.However,the existing contact blood pressure measurement method cannot be carried out in the first time if the patients with large skin burns,infants,or skin allergies are encountered,which makes the contact blood pressure measurement method has certain limitations.And in the process of inflating the cuff,will slowly produce a sense of oppression,let a person feel uncomfortable.One measurement was followed by a few minutes of waiting before another,and was also lacking in long,continuous measurements.The main purpose of this paper is to try to use a non-contact method to measure human blood pressure,so that people can easily and quickly detect their own blood pressure in daily life.In continuous and long time measurement,they can measure their blood pressure at any time without the pressure caused by cuff inflation.According to the principle of IPPG,the method of blood pressure measurement in this paper is proposed.The research work to be completed are as follows:(1)Firstly,I have a brief understanding of the earliest invasive blood pressure measurement methods.There are several non-invasive measurement methods,and the research status of non-invasive blood pressure measurement methods at home and abroad.The comparison between frequently-used contact measurement methods such as auscultation method and volume compensation method and non-contact measurement method proves that non-contact measurement method has many advantages and is worth studying.(2)The principle and technology of non-contact blood pressure collection are introduced.Based on the non-contact blood pressure measurement by ordinary camera and b PTTBP a,through IPPG technology.Combined with imaging photoelectric volume mapping technology(IPPG),the interested area is recorded by ordinary optical lens(human face and palm)video,the video is divided into frames and block the areas of interest.The picture frame sequence is a time series,and the pixel value of the green channel of each picture is calculated to obtain the pulse wave signal;and the signal is processed to calculate the time difference between the two pulse wave signals,and then the blood pressure value of the human body is collected in real time,and the non-contact blood pressure measurement prediction model is obtained by fitting by neural network The parameters needed to establish blood pressure prediction model to realize non-contact blood pressure measurement.(3)Accuracy analysis of the predicted results is required with non-contact BP values obtained with ordinary optical lenses.There are uncertainties in the systolic and diastolic blood pressure predicted by the model.The measurement results of the OMRON wrist electronic sphygmomanometer are used as the benchmark to calculate the errors and analyze the reasons for the errors.The final error of diastolic blood pressure was-9.84-4.35%,and the error of systolic blood pressure was-9.28%-3.16%.