CN-119302618-B - Living body detection method, living body detection device, electronic equipment and storage medium

CN119302618BCN 119302618 BCN119302618 BCN 119302618BCN-119302618-B

Abstract

The application relates to a living body detection method, a living body detection device, electronic equipment and a storage medium, wherein the method comprises the steps of acquiring pulse wave signals of an object to be detected; the method comprises the steps of performing frequency spectrum transformation on pulse wave signals to obtain frequency domain amplitude spectrums within a preset frequency band, obtaining fundamental wave frequencies of the pulse wave signals, determining a plurality of harmonic frequencies within the preset frequency band according to the fundamental wave frequencies, and determining whether an object to be detected is a living body or not according to amplitudes corresponding to the fundamental wave frequencies, amplitudes corresponding to the harmonic frequencies and amplitudes corresponding to each frequency in the frequency domain amplitude spectrums. According to the application, by performing frequency spectrum transformation on the pulse wave signals, whether the object to be detected is a living body can be identified according to the relation among the amplitude corresponding to the fundamental wave frequency, the amplitude corresponding to the harmonic frequency and the amplitude corresponding to each frequency in the frequency domain amplitude spectrum, and only the pulse wave signals are required to be processed, so that the living body detection efficiency is improved.

Inventors

LI ZHENQI
ZHAO WEI

Assignees

广州视源电子科技股份有限公司
广州希科医疗器械科技有限公司
广州视源人工智能创新研究院有限公司

Dates

Publication Date: 20260512
Application Date: 20230712

Claims (9)

1. A living body detection method, characterized by comprising the steps of: acquiring pulse wave signals of an object to be detected; performing frequency spectrum transformation on the pulse wave signals to obtain frequency domain amplitude spectrums in a preset frequency band; acquiring fundamental wave frequency of the pulse wave signal; According to the fundamental wave frequency, determining a plurality of harmonic frequencies in the preset frequency band; summing the amplitude corresponding to the fundamental wave frequency with the amplitude corresponding to all the harmonic frequencies according to the amplitude corresponding to the fundamental wave frequency, the amplitude corresponding to the harmonic frequencies and the amplitude corresponding to each frequency in the frequency domain amplitude spectrum to obtain a first summation result, summing the amplitude corresponding to each frequency in the frequency domain amplitude spectrum to obtain a second summation result, calculating the ratio of the first summation result to the second summation result, and comparing the ratio with a preset threshold to determine whether the object to be detected is a living body.
2. The living body detection method according to claim 1, characterized in that: the step of acquiring the fundamental frequency of the pulse wave signal includes: Acquiring the pulse rate of the pulse wave signal; dividing the pulse rate by a preset value to obtain the fundamental wave frequency of the pulse wave signal.
3. The living body detection method according to claim 1, characterized in that: the step of acquiring the fundamental frequency of the pulse wave signal includes: and taking the frequency corresponding to the maximum amplitude in the frequency domain amplitude spectrum as the fundamental wave frequency of the pulse wave signal.
4. The living body detection method according to claim 1, characterized in that: the step of comparing the ratio with a preset threshold value to determine whether the object to be detected is a living body, includes: If the ratio is greater than or equal to a preset threshold, determining that the object to be detected is a living body; and if the ratio is smaller than a preset threshold value, determining that the object to be detected is a non-living body.
5. The living body detection method according to any one of claims 1 to 4, characterized in that: the step of determining a plurality of harmonic frequencies within the preset frequency band according to the fundamental frequency comprises the following steps: Calculating the frequency of an n-th harmonic according to the fundamental wave frequency, wherein n is an integer greater than or equal to 2; And determining a plurality of harmonic frequencies in the preset frequency band from the n-order harmonic frequencies.
6. The living body detection method according to any one of claims 1 to 4, characterized in that: the step of performing frequency spectrum transformation on the pulse wave signal to obtain a frequency domain amplitude spectrum in a preset frequency band comprises the following steps: and preprocessing the pulse wave signals to obtain preprocessed pulse wave signals, wherein the preprocessing comprises but is not limited to filtering and denoising.
7. A living body detecting device, characterized by comprising: the signal acquisition module is used for acquiring pulse wave signals of the object to be detected; the amplitude spectrum obtaining module is used for carrying out frequency spectrum transformation on the pulse wave signals to obtain a frequency domain amplitude spectrum in a preset frequency band; the fundamental wave frequency acquisition module is used for acquiring fundamental wave frequency of the pulse wave signal; the harmonic frequency determining module is used for determining a plurality of harmonic frequencies positioned in the preset frequency band according to the fundamental frequency; the living body detection module is used for determining whether the object to be detected is a living body according to the amplitude corresponding to the fundamental wave frequency, the amplitude corresponding to the harmonic frequencies and the amplitude corresponding to each frequency in the frequency domain amplitude spectrum.
8. An electronic device comprising a processor and a memory, wherein the memory stores a computer program adapted to be loaded by the processor and to perform the living being detection method according to any of claims 1 to 6.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the living body detection method according to any one of claims 1 to 6.

Description

Living body detection method, living body detection device, electronic equipment and storage medium Technical Field The present application relates to the field of signal processing technologies, and in particular, to a living body detection method, a living body detection device, an electronic device, and a storage medium. Background The photoplethysmography (PhotoPlethysmoGraph, PPG) signal is a common signal for measuring vital signs and can be obtained by means of pulse wave sensor measurements. Due to the limitation of the pulse wave sensor measurement principle, in practical application, some non-living bodies, such as paper towels or clothes, trigger the pulse wave sensor measurement to obtain false pulse wave signals. At this time, if vital signs are calculated on the PPG signal generated by a non-living body, a large number of invalid results may be generated, and even an alarm is erroneously triggered. In the related art, it is necessary to identify whether a subject generating a pulse wave signal is a living body by means of signals other than PPG, for example, an electrocardiographic signal, acceleration, temperature, etc., and the identification process is complicated and takes a long time. Disclosure of Invention Based on this, an object of the present application is to provide a living body detection method, apparatus, electronic device, and storage medium, which can improve the advantage of living body detection efficiency. According to a first aspect of an embodiment of the present application, there is provided a living body detection method including the steps of: acquiring pulse wave signals of an object to be detected; Performing frequency spectrum transformation on the pulse wave signals to obtain a frequency domain amplitude spectrum in a preset frequency band; acquiring fundamental wave frequency of pulse wave signals; according to the fundamental wave frequency, determining a plurality of harmonic frequencies positioned in a preset frequency band; and determining whether the object to be detected is a living body according to the amplitude corresponding to the fundamental wave frequency, the amplitude corresponding to the harmonic frequencies and the amplitude corresponding to each frequency in the frequency domain amplitude spectrum. According to a second aspect of an embodiment of the present application, there is provided a living body detection apparatus including: the signal acquisition module is used for acquiring pulse wave signals of the object to be detected; the amplitude spectrum obtaining module is used for carrying out frequency spectrum transformation on the pulse wave signals to obtain frequency domain amplitude spectrums in a preset frequency band; the fundamental wave frequency acquisition module is used for acquiring fundamental wave frequency of the pulse wave signal; the harmonic frequency determining module is used for determining a plurality of harmonic frequencies positioned in a preset frequency band according to the fundamental frequency; The living body detection module is used for determining whether the object to be detected is a living body according to the amplitude corresponding to the fundamental wave frequency, the amplitude corresponding to the harmonic frequencies and the amplitude corresponding to each frequency in the frequency domain amplitude spectrum. According to a third aspect of embodiments of the present application there is provided an electronic device comprising a processor and a memory, wherein the memory stores a computer program adapted to be loaded by the processor and to perform a living body detection method as described in any of the above. According to a fourth aspect of embodiments of the present application, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a living body detection method as any one of the above. The method comprises the steps of obtaining a pulse wave signal of an object to be detected, carrying out frequency spectrum transformation on the pulse wave signal to obtain a frequency domain amplitude spectrum in a preset frequency band, obtaining fundamental wave frequency of the pulse wave signal, determining a plurality of harmonic frequencies in the preset frequency band according to the fundamental wave frequency, and determining whether the object to be detected is a living body according to amplitude corresponding to the fundamental wave frequency, amplitude corresponding to the harmonic frequencies and amplitude corresponding to each frequency in the frequency domain amplitude spectrum. According to the application, by performing frequency spectrum transformation on the pulse wave signals, whether the object to be detected is a living body can be identified according to the relation among the amplitude corresponding to the fundamental wave frequency, the amplitude corresponding to the harmonic frequency and the amplit