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Heart rate variability detection method based on smart phone camera

A heart rate variability, smart phone technology, applied in the measurement of pulse rate/heart rate, diagnostic recording/measurement, medical science, etc., can solve the problems of poor accuracy, improve accuracy, improve output heart rate accuracy, and avoid false detection Effect

Pending Publication Date: 2022-02-18
霍欣怡 +1
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AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiency of poor accuracy of existing heart rate detection methods, the present invention provides a heart rate variability detection method based on a smart phone camera

Method used

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  • Heart rate variability detection method based on smart phone camera

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Embodiment Construction

[0014] specific implementation plan

[0015] refer to figure 1 The specific steps of the heart rate variability detection method based on the smart phone camera of the present invention are as follows:

[0016] Step 1. Video recording

[0017] Put the human fingertip on the camera of the smartphone, turn on the flash of the smartphone, set the camera to photography mode, set the sampling rate to 30 frames per second, set the white balance to "daylight", and set the focus mode to "no focus", Take a video for a period of time;

[0018] Step 2. Select an area in the video as the ROI.

[0019] First, subtract the brightness value of each pixel of the previous frame image from the brightness value of each pixel of the previous frame image and take the absolute value, that is, the brightness change of each pixel point between two adjacent frame images is obtained. Under normal circumstances, this change value is very small, it is susceptible to noise interference, and it is diff...

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Abstract

The invention provides a heart rate variability detection method based on a smart phone camera. According to the method, a finger is attached to a camera of the smart phone, a flash lamp of the smart phone is turned on, the camera is used for shooting a video for a period of time, then a video signal is processed, and a pulse wave signal can be extracted from the video signal. The principle of the method is very similar to that of photoelectric volume pulse waves. When the heart is contracted, the small artery of the fingertip is hyperemia, the light absorption is strong, and the image is dark; when the heart is diastolic, blood of the small artery of the fingertip flows back, light absorption is weak, and the image is bright. Therefore, the brightness change of the image reflects the blood volume change when the heart beats, and a time sequence pulse wave signal can be obtained by calculating a brightness value for each frame of image. And time domain peak detection or spectrum analysis can be carried out on the wave signal to calculate a heart rate value. The feature points of the pulse waves are further analyzed, the time interval of each heartbeat is calculated, and then heart rate variability analysis can be conducted.

Description

technical field [0001] The invention relates to a detection method of heart rate variability based on a smart phone camera. Background technique [0002] The document "Research on heart rate detection technology based on photoplethysmography [D]. Supervisor: Zhou Yunyao. Wuhan University of Technology, 2014." discloses a method that uses LED lights and light sensors to collect fingertip volumetric pulse waves and detects heart rate. method. In order to avoid the influence of the dicrotic wave peak in the volumetric pulse wave on the main wave peak count, the method skips the dicrotic point by means of the quadratic curve, so as to reduce the error of heart rate calculation. In order not to mistake the dicrotic point as the peak of the main wave, this method designs a self-fitting quadratic curve to detect the main wave peak across the dicrotic point: after judging the previous main wave peak and the following valley point Finally, randomly fit a quadratic function with the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/024A61B5/02
CPCA61B5/02405A61B5/0077A61B5/0082A61B5/7235A61B5/02A61B5/7225A61B5/7203
Inventor 霍欣怡焦宇航
Owner 霍欣怡
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