Geometric Layout Analysis Techniques for Document Image Understanding: a Review
Roldano Cattoni, Tarcisio Coianiz, Stefano Messelodi, Carla Maria Modena · 2008
Document Image Understanding (DIU) is an interesting research area with a large variety of challenging applications. Researchers have worked from decades on this topic, as witnessed by the scientific literature. The main purpose of the present report is to describe the current status of DIU with particular attention to two subprocesses: document skew angle estimation and page decomposition. Several algorithms proposed in the literature are synthetically described. They are included in a novel classification scheme. Some methods proposed for the evaluation of page decomposition algorithms are described. Critical discussions are reported about the current status of the field and about the open problems. Some considerations about the logical layout analysis are also reported. Keywords: document image processing, document image understanding, automatic zoning, geometric and logical layout, page decomposition, document segmentation and classification, text segmentation, skew ang...