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A method for extracting heart rate from face video signals in visible spectrum

A technology for video signal and heart rate, which is applied in the measurement of pulse rate/heart rate, image data processing, instruments, etc., can solve the problem of large amount of calculation, and achieve the effect of low complexity, statistical independence and high precision.

Active Publication Date: 2018-06-15
HEBEI UNIV OF TECH
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Problems solved by technology

Since the cumulant estimation itself requires a large sample, the amount of calculation is large

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  • A method for extracting heart rate from face video signals in visible spectrum
  • A method for extracting heart rate from face video signals in visible spectrum
  • A method for extracting heart rate from face video signals in visible spectrum

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with accompanying drawings, embodiments and attached tables.

[0033] The present invention is a kind of method (abbreviation method, see Figure 1-13 ), the method adopts the following acquisition device and steps: the acquisition device includes a camera connected to the measured object, a computer connected to the camera, and the heart rate of the measured object is displayed on the computer screen; the camera is an arbitrary frame rate 30 frames per second, a camera with a resolution greater than 300,000 pixels; the method comprises the following steps:

[0034] Step 1: Use the visible spectrum as the light source to record a color image of the front of the face; the head position and facial expression remain basically unchanged during the recording, which basically means that there can be slight facial expressions, such as normal blinking;

[0035] Step 2: Perform face detection on each frame of ...

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Abstract

The invention discloses a method for extracting heart rate from human face video signals in the visible spectrum. The acquisition device used in the method includes a camera connected to the measured object and a computer connected to the camera; the method includes the following steps: 1 : Use the visible spectrum as the light source to record the color image of the front of the face; 2: Perform face detection on each frame of the recorded video; on the basis of face detection, perform skin color detection to extract skin color pixels; 3: Separate the R, G, and B channels of the skin color pixels, and obtain the average brightness of each channel of R, G, and B to obtain the original observation signal; 4: Use the diagonal cumulant method to perform blind source separation on the observation signal, and obtain Estimated signal of the original PPG signal; 5: Set a sliding window, perform fast Fourier transform on the estimated signal in the window, intercept the power spectrum within the heartbeat frequency range, and the frequency value corresponding to the maximum power spectrum can be converted into a heart rate value .

Description

technical field [0001] The technical solution of the present invention relates to a non-contact physiological signal measurement technology, specifically a method for extracting heart rate from human face video signals in the visible spectrum. Background technique [0002] Studies in recent years have shown that extracting heart rate through skin color changes in human face video signals is a non-contact, low-cost method that can be used in some special situations, such as damaged skin, newborns, and imperceptible monitoring methods and so on. The acquisition of video heart rate needs to extract the PPG signal. The PPG signal acquisition is based on the basic law of Lambert-Beer light absorption: when the light beam of a certain wavelength is irradiated on the skin surface, it will be transmitted through transmission or reflection. The intensity of the light is reduced by absorption by the skin, muscles, tissues and blood. Among them, the absorption of light by static tiss...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/024G06T7/00G06T7/90
Inventor 王蒙军王楠朱彩虹王霞付晓静
Owner HEBEI UNIV OF TECH
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