Deep sea fishing net detection method based on sonar image

The invention relates to the technical field of image processing, in particular to a deep sea fishing net detection method based on sonar images. The method comprises the following steps: obtaining a fishing net sonar gray level image, and obtaining a gray level characteristic index of each pixel point according to the fishing net sonar gray level image; obtaining each suspected living object type pixel point on the fishing net sonar gray scale image according to the gray scale characteristic index; according to the distance between the pixel points of each suspected living object class, obtaining each suspected living object class corresponding to the fishing net sonar gray level image; according to each suspected living object class corresponding to the fishing net sonar gray scale image, obtaining each living object class corresponding to the current fishing net sonar gray scale image; performing edge extraction on the current fishing net sonar gray level image to obtain each suspected fishing net edge mis