光照变化下的非接触式血氧饱和度检测方法研究  

Research on non-contact blood oxygen saturation detection method under illumination variations

作　　者：陈果 刘科生 CHEN Guo;LIU Ke-sheng(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《医疗卫生装备》2024年第4期32-38,共7页Chinese Medical Equipment Journal

摘　　要：目的:基于成像式光电容积描记(imaging photo plethysmography,IPPG)技术,提出一种在不同光照条件下依然拥有较高准确率的非接触式血氧饱和度检测方法。方法:首先,通过摄像头采集人脸感兴趣区域的图像;其次,使用自适应伽马校正和欧拉视频放大算法对图像进行预处理;再次,将视频信号转化为数字信号,提取IPPG信号,并使用经验小波变换进行滤波去噪;最后,利用二次函数拟合得到血氧饱和度公式,从而计算出血氧饱和度。结果:相较于其他文献算法,该方法具有更强的抗光照变化干扰能力,在不同光照条件下的平均误差均不超过1.5%,最大误差在2%左右,且与指夹式血氧仪的检测结果具有较好的一致性。结论:该方法在不同光照条件下测量血氧饱和度均具有较高的准确率,能够达到实际测量的要求。Objective To propose a non-contact blood oxygen saturation detection method with high accuracy under illumi-nation based on imaging photo plethysmography(IPPG)technology.Methods Firstly,the images of the rigions of interest(ROIs)were acquired with the camera;secondly,image pre-processing was carried out with adaptive gamma correction and Eulerian video magnification algorithms;thirdly,the video signals were transformed into digital ones to extract IPPG sig-nals,and the IPPG signals were filtered and denoised using empirical wavelet transform;finally,the oxygen saturation formula was obtained by fitting a quadratic function to calculate the blood oxygen saturation.Results The method proposed behaved well in resistance to interference from illumination variations,which had an average error under different illumination not more than 1.5%,a maximum error being about 2% and high consistency with the detection results of finger-clip oximeters.Conclusion The method proposed has high accuracy when used to measure the blood oxygen saturation under illumination and meets the needs for practical application.

关 键 词：成像式光电容积描记 血氧饱和度 光照变化 非接触式检测 

分 类 号：R318[医药卫生—生物医学工程]