FIELD: medicine.
SUBSTANCE: group of inventions relates to medicine. Method for determining vital signs of a subject is carried out using a system for determining vital signs. Receiving interface obtains a data stream extracted from electromagnetic radiation, reflected from a skin area of the subject, said radiation being detected by imaging means. Data stream contains a signal from an area of skin pixel areas. Data signal represents the detected electromagnetic radiation reflected from the corresponding area of the skin pixel areas in time. Spatial and/or optical properties of data signals are analysed using an analyser in one or more wavelength ranges. Spatial and/or optical properties of the data signals are compared with a sample representing the expected spatial and/or optical properties. Main frequency component in the spectrum of data signals in one or more wavelength bands is determined and the main frequency components that are to be determined in the expected frequency range are selected. Spatial distribution of the ratio of signal amplitudes in the wavelength ranges of red and infrared light is analysed. Signal amplitudes of the selected main frequency components in the data signal spectrum are analysed in one or more wavelength ranges. Processor determines the vital sign information signal of the subject, based on the spatial and/or optical properties of the signals of said areas of the skin pixel areas within the skin area. Postprocessor determines the desired vital sign from the vital sign information signal.
EFFECT: higher signal-to-noise ratio is achieved to reliably distinguish between heartbeat signals and noise signals having similar temporal and frequency characteristics.
10 cl, 4 dwg
