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PPG (photoplethysmogram) signal extraction method and system based on body surface video, device and medium

A signal extraction and video technology, applied in the field of biomedical signal processing, can solve the problems of many sensors and unfavorable daily monitoring, and achieve the effects of simple operation, signal quality assurance, and low cost

Active Publication Date: 2019-09-20
张远
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology requires more sensors, which is not conducive to daily monitoring

Method used

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  • PPG (photoplethysmogram) signal extraction method and system based on body surface video, device and medium
  • PPG (photoplethysmogram) signal extraction method and system based on body surface video, device and medium
  • PPG (photoplethysmogram) signal extraction method and system based on body surface video, device and medium

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Experimental program
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Embodiment 1

[0040] Embodiment 1, this embodiment provides a PPG signal extraction method based on body surface video;

[0041] like figure 1 As shown, the PPG signal extraction method based on body surface video includes:

[0042] S1: Video recording and video usability judgment: emit light to a certain part of the human body, use the camera to record the body surface video of a certain part of the human body, record the set time; judge the current shooting by analyzing the color saturation of each frame in the video Availability of videos to weed out wrongly recorded videos;

[0043] S2: PPG signal extraction: separate each frame of the available video into the red channel; calculate the red channel, and extract the PPG signal corresponding to the red channel;

[0044] S3: PPG signal preprocessing: Invert the extracted correct PPG signal to obtain a forward signal, and use a low-pass filter to remove high-frequency components of the signal to obtain a preprocessed PPG signal.

[0045]...

Embodiment 2

[0127] Embodiment 2, this embodiment also provides a PPG signal extraction system based on body surface video;

[0128] PPG signal extraction system based on body surface video, including:

[0129] Video recording and video usability judgment module, which is configured to: emit light to a certain part of the human body, use the camera to record the body surface video of a certain part of the human body, record the set time; analyze the color saturation of each frame in the video To judge the availability of the currently shot video, so as to eliminate the wrongly recorded video;

[0130] The PPG signal extraction module is configured to: separate each frame image of the available video into a red channel; calculate the red channel, and extract a PPG signal corresponding to the red channel;

[0131] The PPG signal preprocessing is configured to: invert the extracted correct PPG signal to obtain a forward signal, and use a low-pass filter to remove high-frequency components of...

Embodiment 3

[0132] Embodiment 3, this embodiment also provides an electronic device, including: a processor, an LED light source, and a camera;

[0133] The processor is used to control the LED light source, and the LED light source is used to emit a light source with a preset frequency under the control of the processor;

[0134] The processor is used to control the camera, and the camera is used to collect video of a certain part of the subject's body under the control of the processor;

[0135] The processor is also used to complete the steps of the method in one embodiment, realize the extraction and preprocessing of the PPG signal on the collected video, and obtain the preprocessed PPG signal. For the sake of brevity, details are not repeated here.

[0136] Described electronic device can be mobile terminal and non-mobile terminal, and non-mobile terminal comprises desktop computer, and mobile terminal comprises smart phone (Smart Phone, such as Android mobile phone, IOS mobile phon...

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Abstract

The invention discloses a PPG (photoplethysmogram) signal extraction method and system based on body surface video, a device and a medium. The method herein comprises video making and video availability judging, to be specific, emitting irradiating light to a certain part of a human body, making a body surface video for the certain part of the human body through a camera for a set period of time, and judging availability of the current video by analyzing color saturation of each frame in the video so as to remove mistakenly-made video pieces; extracting PPG signals, to be specific, isolating a red channel for each frame image of the available video, and calculating the red channel to extract PPG signals corresponding to the red channel; and preprocessing the PPG signals, to be specific, reversing the extracted correct PPG signals to obtain forward signals, and removing high-frequency parts of the signals through a low-pass filter to obtain preprocessed PPG signals.

Description

technical field [0001] The present disclosure relates to the field of biomedical signal processing, in particular to a PPG (photoplethysmogram) signal extraction method, system, device and medium based on body surface video. Background technique [0002] The statements in this section merely mention background art related to the present disclosure and do not necessarily constitute prior art. [0003] In the process of realizing the present disclosure, the inventors found that the following technical problems existed in the prior art: [0004] With the rapid development of biometric technology, people's requirements for the extraction and utilization of various biometric features are constantly increasing. The traditional PPG signal extraction method uses LED light sources and detectors as the basis to measure the reflection and absorption of human blood vessels and tissues. Attenuated light can trace blood volume changes in a certain part, but this extraction method usually...

Claims

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Application Information

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IPC IPC(8): A61B5/026
CPCA61B5/0077A61B5/0261A61B5/72
Inventor 张远张高菠许力许文耀卢秉礼
Owner 张远
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