Layout analysis of historical Tibetan documents

Layout analysis of historical Tibetan document is very important task in the processing of document rebuilding. The result of layout analysis can be used to segment text regions. The task includes skew correction, region segmentation, page layout and structure. Skew correction process uses Tibetan baseline feature and Hough transform to get baseline, so as to get the skew angle of the document. After skew correction, getting the position of border is to realize region segmentation. To obtain the border, we have adopted a series of treatments such as median filtering, Gaussian smoothing, Sobel edge and edge smoothing, removing small area regions, and obtaining the border position. we determine the location of other regions according to the position relationship between border and other regions, e.g. text region, left comments, right comments. Finally, we use XML format to save page information such as author, date time and page information and region positions. Our method is simple and realize batch image layout analysis.