Fractal code is approved an effective method to compress digital image. It proposes a new method to analyze digital image retrieval by fractal iterative function system. By image fractal code and obtained its iterative function

then the image and its iterative function are saved database becoming index file of the image. When database is searched and image index file is compared so that user retrieval images similar to query image. The index files of based on fractal code have three characteristics

the first

similar images have similar iterative functions so can produce similar index files; the second

similar index files can retrieval similar images; the third

no similar images have no similar iterative functions

vice versa. Compare to other methods are used to create database

their index files have not these characteristics. The fractal code produces large of data and needs an effective method to retrieval. So it combines to fractal function information

based on discriminant analysis estimating images similarity

so that determine correlation sequence of all images in database similar to query image. Experiment shows this retrieval method specialties

efficiency and robustness.