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We propose a fast and robust skew estimation method for scanned documents that estimates skew angles based on piecewise covering of objects, such as textlines, figures, forms, or tables. The method first divides a document image into a number of non-overlapping slabs in which each object is covered by parallelograms. It then estimates the skew angle based on these parallelograms or, equivalently,...
In document layout analysis, the defining conditions for textlines and text regions involve certain numerical parameters (e.g. inter-character spacing and inter-textline spacing) whose values can only be estimated when textlines and text regions have already been formed. This seemingly chicken-and-egg problem can be solved through an adaptive regrouping strategy, which consists of three operations...
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