Many methods on form document image analysis have been proposed

but few have treated the extraction of logical structure. A new method for the logical structure extraction of form document is proposed in this paper. The algorithm of it consists of three phases: global division of the whole document

local logical structure analysis and global re-division of the whole document. This method emphasizes the synthetic analysis of the global and local layout structure of a form document. Compared with other local-layout-structure-analysis methods

it has higher accuracy and can treat with more complex form documents.