Three-dimensional dental jaw mesh model segmentation method

The invention discloses a three-dimensional dental jaw grid model segmentation method, belongs to the technical field of computer imageology, and aims to segment and extract each tooth according to dental jaw model data in a three-dimensional space. The method comprises the following steps: firstly, positioning a transition area between teeth and gingiva, calculating the average curvature of eachpoint of a three-dimensional dental jaw grid model in a local quadric surface fitting manner, and screening out a transition area concave point set between the teeth and the gingiva according to a negative minimum principle; constructing a concave point set between the tooth and the gingiva into a circle of closed single-point width contour line around the tooth based on mathematical morphology operation, and segmenting the tooth and the gingiva by utilizing a union set algorithm; and finally, projecting the whole tooth obtained by segmentation to two dimensions for refining to obtain a dentalarch curve so as to ident