Fish passing channel target fish image segmentation method and system

The invention relates to a method and a system for segmenting a target fish image of a fish passing channel. The method for segmenting the target fish image in the fish passing channel comprises the following steps: acquiring a video image in a to-be-detected fish channel, and acquiring a video sequence image of the video image; acquiring image pixel points of each frame of image in the video sequence image by adopting an image feature separation method, and converting the image pixel points into image RGB (Red, Green, Blue) three-channel data; determining whether a foreground pixel value exists in the video sequence image according to the RGB three-channel data of the image; when a foreground pixel value exists in the video sequence image, a static color background image is extracted according to the foreground pixel value by adopting a model-free adaptive control method; and performing differential operation on the video sequence image and the static color background image to obtain a moving foreground targ