Brain blood oxygen saturation monitoring method and system

The invention relates to the field of blood oxygen saturation monitoring, and discloses a brain blood oxygen saturation monitoring method and system, and the method comprises the following steps: obtaining the skin pigmentation degree of a forehead region of a target user; acquiring real-time measured oxyhemoglobin saturation of the forehead area of the target user through a brain oxyhemoglobin saturation monitor; the method comprises the following steps: acquiring an environment image of an area where a target user is located at the same time as real-time measurement of the oxyhemoglobin saturation, recording the environment image as a first image, acquiring the first image through a camera of an oxyhemoglobin saturation monitoring system, dividing the first image, performing DCT (Discrete Cosine Transform) on each image block, averaging direct-current components of all the image blocks, and obtaining an average value; obtaining a brightness parameter capable of representing the brightness of the ambient lig