An object-oriented model for drawing understanding and its ability of noise absorption

In this paper we propose a new framework of object-oriented model named MTDM (Matching Tree Driving Model) for drawing understanding and verify its ability of noise absorption. MTDM makes use of descriptions of object-oriented style and is an integration of static and dynamic description of recognition target. Static descriptions are for representation of abstract features so that description of structure and restriction become easier. At the same time static descriptions can be independent of matching procedures of recognition target. The dynamic descriptions are for matching control of recognition target in the form of tree structure named matching tree. Matching procedures for complex targets can be easily described with multiple matching trees. By application to several typical engineering drawings, particularly drawings with noises and distortions MTDM is proven to be suitable for multipurpose and multitarget platform.