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基于热成像技术的非接触式生命体征测量方法

李牧 吴彤 田哲嘉

李牧, 吴彤, 田哲嘉. 基于热成像技术的非接触式生命体征测量方法[J]. 红外技术, 2022, 44(4): 428-436.
引用本文: 李牧, 吴彤, 田哲嘉. 基于热成像技术的非接触式生命体征测量方法[J]. 红外技术, 2022, 44(4): 428-436.
LI Mu, WU Tong, TIAN Zhejia. Non-contact Vital Signs Measurement by Thermal Imaging Technology[J]. Infrared Technology , 2022, 44(4): 428-436.
Citation: LI Mu, WU Tong, TIAN Zhejia. Non-contact Vital Signs Measurement by Thermal Imaging Technology[J]. Infrared Technology , 2022, 44(4): 428-436.

基于热成像技术的非接触式生命体征测量方法

详细信息
    作者简介:

    李牧(1978-),男,陕西鄠邑区人,高级工程师,博士研究生,研究方向为雷达信号处理,图像处理。E-mail:467611900@qq.com

    通讯作者:

    吴彤(1995-),女,陕西咸阳人,硕士研究生,研究方向为图像处理、信号处理。E-mail:1219251960@qq.com

  • 中图分类号: TN219

Non-contact Vital Signs Measurement by Thermal Imaging Technology

  • 摘要: 针对目前临床上监测生命体征设备的不便携带、接触人体等问题实现了一种将红外热成像仪作为信息采集设备,通过分析人体面部血管模型及鼻孔位置温差变化得到心率值和呼吸信息的方法。首先对获取的热像图序列提取前景目标以缩短在整幅图像中进行人脸检测的时间,再利用各向异性扩散滤波法增强感兴趣区域内血管位置的对比度,并利用形态学处理获得人脸血管部位的灰度均值形成初始心率信号。最终通过趋势消除、小波阈值去噪方法去除时间序列中的趋势项和随机噪声获取最终的心率波形图和动态心率、呼吸值。与医院专用设备对比试验得出该方法可控制心率误差小于4%,平均的均值误差为$ \left| {\bar d} \right| $=0.718次/min。呼吸误差在1次/min内,具有较高的准确性和鲁棒性,能够满足实际需求。
  • 图  1  提取前景目标

    Figure  1.  Extraction of prospect target

    图  2  追踪的感兴趣区域

    Figure  2.  The area of interest to track

    图  3  各项扩散滤波前后效果图

    Figure  3.  Effects of Anisotropic diffusion filtering before and after

    图  4  获取ROI区域血管模型

    Figure  4.  Obtain vascular models in the ROI region

    图  5  灰度均值变化的初始时间序列图

    Figure  5.  Initial time series of gray level mean variation

    图  6  原始心率信号及HP滤波

    Figure  6.  Original heart rate signal and HP filter

    图  7  残差时间序列

    Figure  7.  Residual time series

    图  8  小波阈值去噪过程

    Figure  8.  Wavelet threshold denoising process

    图  9  心率频域分析图

    Figure  9.  Heart rate frequency domain analysis diagram

    图  10  测试界面

    Figure  10.  GUI Testing

    图  11  心电图机

    Figure  11.  Electrocardiogram

    表  1  检测生命体征的非接触式方法对比

    Table  1.   Comparison of non-contact methods for vital signs detection

    Non-contact measurement method Advantage Shortcoming
    Radar Strong penetrability and accurate measurement results Long-term radiation is harmful, susceptible to electromagnetic wave interference
    IPPG Strong portability, low cost, comfortable and non-invasive Easily affected by light, cannot detect at night
    Thermal imaging technology Non-invasive, all-day, all-weather detection; night-time detection; support for telemedicine The image details are not clear and the resolution is poor
    下载: 导出CSV

    表  2  残差序列ADF检验

    Table  2.   Residual sequence ADF test

    Value t-statistic P-value
    Augmented Dickey-Fuller
    test statistic
    −5.640742 0.000001
    Critical value 1% level
    5% level
    10%level
    −3.605565
    −2.937069
    −2.606986
    下载: 导出CSV

    表  3  男性测试者动态心率结果对比

    Table  3.   Comparison of dynamic heart rate results in male

    Time/s 1 2 3 4 5
    M/bpm R/bpm M/bpm R/bpm M/bpm R/bpm M/bpm R/bpm M/bpm R/bpm
    5 65 65 70 72 75 77 65 63 69 70
    10 66 64 70 71 74 75 65 65 69 69
    15 64 64 69 72 73 75 67 65 70 68
    20 62 64 72 70 73 73 66 65 68 67
    25 65 63 72 72 72 72 65 64 66 65
    30 63 64 71 73 71 73 63 63 65 65
    35 65 64 70 71 72 73 64 63 67 65
    40 65 65 69 70 72 72 64 65 65 67
    45 63 64 69 69 73 72 63 63 65 65
    50 64 65 70 70 73 71 63 63 66 66
    55 64 65 70 71 72 72 64 63 68 67
    60 65 64 71 72 71 72 63 64 66 67
    下载: 导出CSV

    表  4  女性测试者动态心率结果对比

    Table  4.   Comparison of dynamic heart rate results in female

    Time/s 6 7 8 9 10
    M/bpm R/bpm M/bpm R/bpm M/bpm R/bpm M/bpm R/bpm M/bpm R/bpm
    5 78 78 80 81 68 70 82 85 80 78
    10 76 77 79 81 69 69 85 86 80 79
    15 77 76 78 80 68 68 81 84 81 78
    20 78 75 79 79 67 68 82 83 82 78
    25 79 76 78 79 68 67 84 84 80 82
    30 78 78 80 78 68 67 83 85 82 81
    35 80 78 81 80 65 67 81 85 84 83
    40 79 77 80 82 64 65 82 83 83 81
    45 78 76 79 80 65 65 82 84 85 83
    50 78 76 78 79 68 66 82 85 83 82
    55 77 76 79 79 67 65 82 82 82 82
    60 77 75 79 79 66 65 81 83 81 82
    下载: 导出CSV

    表  5  对10个测试者心率均值偏差分析

    Table  5.   Deviation analysis of the mean heart rate of 10 testers

    Number $ {\bar M_{{\text{estimate}}}} $/
    (times/min)
    $ {\bar M_{{\text{true}}}} $/
    (times/min)
    d/
    (times/min)
    1 64.25 64.25 0
    2 70.25 71.08 −0.83
    3 72.58 73.08 −0.5
    4 64.33 63.83 0.5
    5 67 66.75 0.25
    6 77.92 76.5 1.42
    7 79.16 79.75 −0.59
    8 66.92 66.83 0.09
    9 82.25 84.08 −1.83
    10 81.92 80.75 1.17
    下载: 导出CSV

    表  6  测试者呼吸平均值结果对比

    Table  6.   Comparison of the average results of the tester's breath

    Number MBR/
    (times/min)
    MBR′/
    (times/min)
    RBR/
    (times/min)
    error/
    (times/min)
    1 13.92 14 13 +1
    2 13.58 14 14 0
    3 16.5 17 16 +1
    4 12.33 12 12 0
    5 13.5 14 14 0
    6 15.91 16 16 0
    7 17.83 18 18 0
    8 12.33 12 13 -1
    9 19.33 19 19 0
    10 17.66 18 17 +1
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-04-14
  • 修回日期:  2021-06-24
  • 刊出日期:  2022-04-20

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