基于多尺度样本熵方法分析欧拉视频放大技术在非接触式测量的作用

Application of Euler video amplification technology in non-contact measurement:an analysis based on multi-scale sample entropy

欧拉视频放大技术常被应用在光电容积脉搏波信号增强过程中,脉率测量是需要经常进行的处理,为明确脉率在经过此放大以后是否受到影响,本研究对放大前后信号的峰值关键特征进行比较和研究。由于熵被广泛用来表征信号的复杂性,其通过计算信息的平均产生率来进行检测和分析,且由于多尺度样本熵的计算不依赖数据长度并具有良好的一致性,所以本研究基于多尺度样本熵对脉搏的瞬时心率进行比较。试验结果表明:脉搏信号放大前后保持基本脉率,但放大后样本熵数值比放大前略低,说明欧拉视频放大技术对数据的复杂度方面有减弱作用,同时使其信号结果更加稳定。

Euler video amplification technology is frequently used in the enhancement of pulse photoplethysmography signals,and the pulse rate measurement is often necessary during the process.In order to determine whether the pulse rate is affected during the magnification,the key characteristics of the peak value of the signals before and after magnification are researched.Entropy is used to represent the complexity of signals by calculating and analyzing the average generation rate of information,and the calculation of multi-scale sample entropy has a good consistency and does not depend on the length of data.Therefore,the instantaneous heart rate of pulses is compared based on multi-scale sample entropy.The experimental results show that the basic pulse rate is maintained after pulse signal amplification,but the sample entropy value after amplification is slightly lower than that before amplification,which indicates that Euler video amplification technology has a weakening effect on the complexity of data and meanwhile makes the signals more stable.