Heart rate and breath analysis processing method based on thermal imaging technology

Abstract

The invention provides a heart rate and breath analysis processing method based on a thermal imaging technology. The method comprises the following steps of: acquiring a sequence image; generating a foreground target in a foreground region according to an obtained region of interest for segmenting the sequence image and the background; performing face detection on the foreground target to obtain a face region of interest; obtaining a human face blood vessel region through gray value conversion, and averaging the gray values of the human face blood vessel region to form an initial dynamic heart rate waveform based on a time sequence; and obtaining power spectrums of heart rate signals and respiration signals through a classic spectrum and a Fourier transform-based periodic method, and obtaining a heart rate value and a respiration value. In the initial stage of collecting a sequence image, the sequence image is preprocessed, so that the problem that the edge information of the foreground target is fuzzy and image segmentation is not facilitated due to the fact that much interference noise is inevitably mixed in the sequence image caused by factors such as internal noise of equipment of an existing thermal imager, different external environments and subjects is solved.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a heart rate and respiration analysis and processing method based on thermal imaging technology. Background technique [0002] It is known that heart rate and respiration measurement are mainly used in medical image monitoring and nursing, while the method of measuring vital signs of patients is the electrocardiographic signal method (the representative instrument is an electrocardiogram machine), and the daily detection methods are pressure oscillation method, photoelectric measurement method, Bioelectric method, etc. (using wrist type, finger clip type, etc.), these measurement methods are all contact measurement methods. [0003] For example, the contact measurement method requires direct or indirect contact with a specific part of the tester's skin and keeps still. Behavioral infants, mentally ill) heart rate detection brings inconvenience and restrictions; at the ...

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Problems solved by technology

[0006] Based on this, the present invention uses thermal infrared imaging technology, which is based on the temperature change of the anthropometric measurement area, and is not affected by the intensity of light. At the same time, in order to avoid that the image resolution obtained by thermal imaging technology is poor and there is much noise, resulting in thermal imaging The results of technical measurement of vital signs are extremely unstable and the accuracy is low. A method is proposed to convert the temperature changes of facial blood vessels into periodic changes of gray values ​​and display them as time series signals to obtain heart rate and respiration by acquiring human face videos. method of information

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