Improved QEM three-dimensional model simplifying method

An improved QEM three-dimensional model simplifying method belongs to the field of image processing technology. The invention aims to provide the improved QEM three-dimensional model simplifying method which effectively keeps model details and realizes details that are more similar with those of an original model through improving a QEM three-dimensional model. The improved QEM three-dimensional model simplifying method comprises the steps of acquiring a dihedral angle, acquiring a Gauss curvature and an average curvature, acquiring a discrete curvature, acquiring an improved error measuring matrix; and integrating area summation of triangles at vertexes, vertex curvatures and a secondary error matrix, thereby forming error control factors in grid simplification. According to the improved QEM three-dimensional model simplifying method, through differential approximation of countless planar triangles to a smooth grid surface, the bending degree at each vertex can be described by means of surface curvature of differential geometry. For keeping the sharp characteristic in the grid before and after simplification, grid simplification quality can be controlled through measurement to the vertex curvature change.