Heart rate detection method based on smart phone

A smart phone and detection method technology, applied in the measurement of pulse rate/heart rate, diagnostic recording/measurement, medical science, etc., can solve the problems of poor precision and achieve the effects of average error control, avoiding missed detection, and avoiding false detection

Inactive Publication Date: 2016-11-09
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

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

Method used

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  • Heart rate detection method based on smart phone

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Embodiment Construction

[0014] refer to figure 1 . The concrete steps of the heart rate detection method based on the smart phone of the present invention are as follows:

[0015] (1) Video recording.

[0016] Input the video images of the skin color changes of human fingertips, palms or faces and other parts of the skin under the irradiation of a stable light source into the smart phone.

[0017] (2) Extract volume pulse wave.

[0018] The application running on the smartphone obtains the average gray value μ of a single pixel in each frame of image G . will μ G Stored in chronological order as the sampling signal of the volumetric pulse wave. Take the μ of the grayscale image in the first five seconds of the video G The sum is divided by the total number of frames of the previous five seconds of video, as the baseline μ of the volumetric pulse wave MEAN . Add -μ to each point of the sampled signal of the volumetric pulse wave MEAN Finally, as the amplitude, it is continuously drawn on the...

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Abstract

The invention discloses a heart rate detection method based on a smart phone. The heart rate detection method is used for solving the technical problem that an existing heart rate detection method is poor in precision. According to the technical scheme, the heart rate detection method comprises the steps that a video recording human body skin color changes under irradiation of a stable light source is input to the smart phone, and human body volume pulse waves are calculated and captured by the smart phone; when main wave peaks are sought, an amplitude value of a current detection point is compared with an average amplitude value of multiple previous point near the current detection point, the volume pulse waves are located in a descending branch if the amplitude value of the detection point is small, the volume pulse waves are located in an ascending branch if the amplitude value of the detection point is large, alternation from the ascending branch to the descending branch serves as one main wave peak, and the heart rate is calculated by combining the interval time of the main wave peaks. According to the method, detection is always conducted along volume pulse wave signals, and therefore missing detection of the main wave peaks is avoided; the amplitude value of the current detection point is always compared with the average amplitude value of multiple previous points near the current detection point, therefore, double pulse peaks cannot change the descending state of the pulse waves, and false detection of the main wave peaks is avoided. Accordingly, the hear rate detection precision is improved.

Description

technical field [0001] The invention relates to a heart rate detection method, in particular to a smart phone-based heart rate detection method. 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 quadra...

Claims

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Application Information

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IPC IPC(8): A61B5/024A61B5/00
CPCA61B5/024A61B5/0077A61B5/02438
Inventor 夏勇郝梦圆
Owner NORTHWESTERN POLYTECHNICAL UNIV
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