Optic nerve disc positioning and focusing method suitable for fundus camera

The invention discloses an optic nerve disc positioning and focusing method suitable for a fundus camera, relates to the technical field of digital image processing, and solves the problems that an existing fundus automatic focusing system can only determine a region of interest according to a shot fundus image, and the positioning and focusing processes of the region of interest cannot be performed at the same time due to inevitable movement of human eyes, so that the image quality is poor. In order to solve the problem that focusing is inaccurate due to the fact that the focusing distance of a camera is continuously adjusted, the eye fundus of a human eye is shot, a series of eye fundus images with different focusing distances are obtained, the position of an interested area is presumed, and a focusing evaluation function value of the interested area is calculated in a local area around the interested area; the position of an optic nerve disc is predicted, the position of a corresponding to-be-detected area