This paper discusses the methods of similarity measurement of most clustering algorithms,and taking the type of attribute as a standard of choosing similarity,it expounds the methods used to measure numerical attribute,categorical attribute and mixed attribute.

The method of judging film damage based on image similarity;

In this paper, a novel image similarity is defined and deduced based on the orthogonal Proscrustes problem.

Further more,a scheme developed from the image similarity technology can dramatically reduce the data demanded by the common image-based rendering.

In recognition of images,the information which is not precise results in the difficulties of accurate identification,especially for the similar images,because the number of samples is very limited.