Method for generating and using eight-direction three-dimensional operator for enhancing three-dimensional image contour

The invention discloses a method for generating and using an eight-direction three-dimensional operator for enhancing three-dimensional image contour. The constructed operator can process clear innerand outer contours of a three-dimensional image, and highlights internal and external structure changes of a three-dimensional image. The method comprises the following steps: firstly, respectively integrating gradient changes in all directions around a central pixel point of a cube into eight directions of a diagonal line of the cube to obtain the gradient changes in the eight directions, and then respectively mapping the gradient changes in the x direction, the y direction and the z direction to obtain the gradient changes of the pixel point. The operator gives full consideration on the relation between the overall information and the local information of the image. A very good enhancement effect is achieved on gray scale changes in all directions except for the x direction, the y direction and the z direction,