Model based system for analyzing document images

Document image analysis is the process of deriving logically structured representation of a document by analyzing the layout structure of its image. This paper proposes a knowledge based system for document image analysis which is applicable to various kinds of documents. The characteristics of the system are as follows: (1) The knowledge base called document model encodes only object-level knowledge hierarchically, declaratively and symbolically, aiming at high expressivity and maintainability of the knowledge description; (2) the document model is automatically constructed by referring samples of document images, and incrementally refined by feedback of error information of analysis