Four kinds of topological operations suitable for sculptured feature descriptions, i.

So feature description and extraction of shape is the main content of this topic.

To deal with the matching of 3D terrains which involves similar transformations of scale,rotation,and shift,a terrain contour matching approach based on the invariant feature description of a 3D terrain is proposed.

From the angle of manufacturing, this paper proposes a kind of feature taxonomy approach based\|on feature families, discusses several problems derived from comprehension difference to the concept of feature between the stage of modeling and recognition, and introduces the corresponding feature representation method, which meet sufficiently the demand of the different stages of product life ci.

According to the conception of color run-length, a method of feature representation based on run-length matrix for color image was proposed,then two similarity criterions were given.

This paper analyzes a similarity between attack characteristic and antigen,and then puts forward a new expression of signature with the multi-level & multi-characteristic fuzzy with characteristic element,characteristic factor,characteristic base and intrusion pattern.