PPG-based non-contact non-invasive heart rate and respiration measuring method and system

Abstract

The invention discloses a PPG-based non-contact non-invasive heart rate and respiration measuring method. The method comprises the following steps: step 1, image acquisition; step 2, region of interest ROI acquisition; step 3, ICA and consistency analysis; step 4, change signal acquisition; step 5, Gaussian filtering processing and multi-scale analysis; and step 6, fast Fourier transform. According to the method, a novel time domain heart rate and respiratory value signal extraction scheme based on a histogram statistics thought is used, noise information contained in obtained time domain signals is reduced, and the accuracy of heart rate detection is enhanced; a Gaussian filtering denoising method is innovatively used, so that the robustness of the system is greatly improved; Overlays isconstructed for an algorithm with a large calculation amount, and hardware acceleration is carried out at a PL end; and the PS end utilizes a time overlapping method to improve algorithm parallelism,realizes portability of hardware of the low-performance FPGA, and meets the requirements of real-time heart rate and respiratory value calculation on high frame number of a video.

Description

technical field [0001] The invention belongs to the technical field of physiological information detection, in particular to a PPG-based non-contact non-invasive heart rate and respiration measurement method and system. Background technique [0002] Heart rate measurement methods are divided into contact measurement and non-contact measurement according to whether they are in contact with the subject. Contact measurement methods mainly include pressure method, resistance method and electrocardiogram method. The pressure method has high accuracy, but the measuring equipment often includes a large air pump, which is very inconvenient to carry. [0003] The equipment of the resistance method is simple, but the error in measuring the heart rate through the change of the resistivity is relatively large, and inconsistent results will be produced with the change of the physiological and psychological state of the subject. The ECG method is a professional electrocardiogram measure...

AI Technical Summary

Problems solved by technology

However, due to environmental factors and noise in daily applications, the stability is poor, and it performs better in relatively static conditions.

[0007] FPGA-based non-contact human heart rate measurement system ("Electronic Technology and Software Engineering" 2019 Issue 20, page 80), this system uses hardware to implement the heart rate detection method based on PPG signals, but the method framework process is based on MIT's Poh team, In daily application, it is greatly affected by environmental factors, noise, and poor stability. It performs better in relatively static conditions.

[0008] In summary, the contact heart rate measurement method and the non-contact measurement method have corresponding limitations respectively. The present invention aims to solve the inconvenience of carrying caused by different contact heart rate measurement methods, large error, high cost, and the existence of Limitations and other shortcomings, as well as noise and stability problems in current PPG-based detection methods

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