Abstract: Different ways to three-dimensional modeling are analysised, especially the methods and procedures of modeling based on image, the problems caused by the matching of homonymy point-pairs in the Image based Modeling are also discussed. A new method is advanced, which uses the key points to build a key polygon before constructs some homonymy point-pairs based on the polygon's comparability. The method's validity is also proved by using a experiment.

Key words: homonymy points, image based modeling, image matching