1 Introduction
Multimedia processing is one of the major areas in information technology (IT). Automatic document analysis is a fundamental issue in many applications including optical character recognition (OCR), form and bank check reading and document image storage and retrieval Document image understanding covering a variety of documents such as facsimiles [1], bank checks [2], business letters [3], forms [4], postal mail parcels [5] and technical articles [6], [7], has been an interesting research area for a long time [8].