Heart rate acquisition system on facial image

doi:10.3788/OPE.20152313.0652

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Heart rate acquisition system on facial image

更新时间：2020-08-13

- Heart rate acquisition system on facial image
- Optics and Precision Engineering Vol. 23, Issue 10z, Pages: 651-659(2015)
- 作者机构：
  
  吉林大学仪器科学与电气工程学院,吉林长春,130026
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20152313.0652
  CLC： TH773;TP391
- Received：05 June 2015，
  
  Revised：21 June 2015，
  
  Published：14 November 2015
- 稿件说明：
移动端阅览
吕扬, 刘杰,. 基于面部图像的心率测量系统[J]. 光学精密工程, 2015,23(10z): 651-659

L&#220, Yang, LIU Jie. Heart rate acquisition system on facial image[J]. Editorial Office of Optics and Precision Engineering, 2015,23(10z): 651-659
吕扬, 刘杰,. 基于面部图像的心率测量系统[J]. 光学精密工程, 2015,23(10z): 651-659 DOI： 10.3788/OPE.20152313.0652.

L&#220, Yang, LIU Jie. Heart rate acquisition system on facial image[J]. Editorial Office of Optics and Precision Engineering, 2015,23(10z): 651-659 DOI： 10.3788/OPE.20152313.0652.

摘要

研究了非接触式心率采集方法

设计了基于脸部图像处理的心率测量系统。利用该系统分两步完成了对人脸部分区域图像的视频采集和处理。第一步

对单幅图像进行处理。首先建立一个非彩色模型对原始图像进行颜色校正

去除光线带来的干扰;然后

利用直方图和脸部特征定位样本区域;在空间域和时间域上对图像进行增强

将窄带灰度输入值映射到宽带输出值

并将照射分量与反射分量分离

进一步去除光线照射不均带来的干扰;最后求出单幅图像的反射均值。第二步

采用小波变换和Hilbert算法对所有图像均值构成的曲线进行处理

消除波形的基线漂移

并使R波更容易被检测到

最后得到心率值。多条件下的实验结果表明:光线充足的情况下

测得的心率误差不大于8%;光线较差的情况下

心率误差不大于20%;基本上实现了通过采集人脸区域光线变化计算心率的功能要求。由于摄像头采集速率的限制

在满足信号完整性的情况下

系统的实时性为每5 s更新一次。

Abstract

The extent of face absorption light changing along with the heart beat rate was verified

and a heart rate acquisition system based on the facial image processing was designed. Human face images were sampled in a video form by the system and they were processed in two steps. The first step was the processing of a single image. Firstly

an achromatic color model was built to correct the color of the original image and to remove the interference from light brings. Then

the sample area was positioned using a histogram and facial features

and the image was enhanced in space and time domains. Furthermore

narrowband gray input values were mapped to the output value broadband and to separate the illumination component and the reflection component

so the interference caused by uneven light irradiation could be further erased. Finally

the mean reflection of single image was calculated. In the second step

the wavelet transform and Hilbert algorithm were used to process the mean curve consisting of all the images and to eliminate the baseline drift wave

making the R wave more likely to be detected and to get the heart rate finally. Experimental results under many conditions show that the heart rate error is no more than 8% under a good light condition

and that is no more than 20% at a poor light condition. Basically

the system achieves the functional requirement of the heart rate calculation by sampling the light of some face region changes. Due to limitations of the camera sampling rate

the real-time performance of the system is updating every 5 s in the case of signal integrity ensured.

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references

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