Visualization of characteristic region in unstructured vector field

How to determine if some special structures in a vector field are in some other vector fields,how to evaluate the similarity between two vector fields,how to detect,locate and render these special structures in several vector fields.Involved in these issues is visualization method based on feature contrasting.An approach for the visualization of characteristic region in unstructured vector field based on curve structure is presented,by constructing a cylindrical coordinate relevant to the curve structure,the translation,rotation and scale invariability of the features are guaranteed;Clifford Fourier transform is used to get the frequency domain features and the cal-culation is simplified;using matching algorithm of curve structures and multiscale approximation,the visualization of characteristic region is implemented in unstructured vector field.