1. A clustering method for rosette scan images, comprising the steps of: (a) obtaining a subject image according to a rosette pattern; (b) arraying the said obtained image data into a two-dimensional memory by converting the location information of the said data; (c) reading the image data stored in the said two-dimensional memory in the orderly manner from the first row and defining partial clusters if the data have 1s continuously as their values; (d) storing the partial clusters created upon the complete performance of the said step (c) until the end of the said two-dimensional memory; (e) examining the adjacency among the said created partial clusters; and (f) binding the adjacent clusters detected in the said step (e) into one independent cluster.