Biological information detection apparatus and biological information detection method

A biological information detection apparatus, comprising:

• a camera that acquires an image with visible light and infrared light;
• a detection region signal generation section that detects a color region of skin of a patient based on the image acquired with the visible light and decomposes an image signal captured by the camera into a wavelength of an image and a spectrum intensity;
• a first wavelength fluctuation detection section that detects a temporal variation of a wavelength of an image with the visible light to generate a first wavelength difference data signal, and determines the color region as a target region of variation detection of the wavelength;
• a first amplitude detection section that detects an amplitude of the first wavelength difference data signal;
• a second wavelength fluctuation detection section that detects a temporal variation of a wavelength of an image with the infrared light to generate a second wavelength difference data signal;
• a second amplitude detection section that detects an amplitude of the second wavelength difference data signal;
• a ratio calculation section that calculates a ratio between the amplitude of the first wavelength difference data signal and the amplitude of the second wavelength difference data signal;
• and
• an oxygen saturation concentration calculation section that calculates an oxygen saturation concentration based on the calculated ratio between the amplitudes, wherein
• the detection region signal generation section performs the decomposition into the wavelength of the image and the spectrum intensity by converting the image signal into a signal of an HSV color space such that a hue is a wavelength and a value is a spectrum intensity, and
• the oxygen saturation concentration calculation section corrects the calculation of the oxygen saturation intensity using the value as a signal representative of an intensity of the light.