Hani Daher

Ancient Handwritings Decomposition Into Graphemes and Codebook Generation Based on Graph Coloring

We present in this paper a new method of analysis and decomposition of handwritten documents into glyphs (graphemes) and their associated code book. The different techniques that are involved in this paper are inspired by image processing methods in a large sense and mathematical models implying graph coloring. Our approaches provide firstly a rapid and detailed characterization of handwritten shapes based on dynamic tracking of the handwriting (curvature, thickness, direction, etc.) and also a very efficient analysis method for the categorization of basic shapes (graphemes). The tools that we have produced enable paleographers to study quickly and more accurately a large volume of manuscripts and to extract a large number of characteristics that are specific to individual writer or specific era.

Multipage Administrative Document Stream Segmentation

We propose in this paper a framework for the segmentation and classification of document streams. The framework is composed of two modules: segmentation and verification. The two modules use an incremental classifier which learns progressively along the stream. In the segmentation module a relationship between two consecutive pages is classified as either: continuity or rupture. Rupture is synonymous of a clear break, thus probably a complete document. If the classifier is uncertain on whether the relationship should be a continuity or a rupture, an over-segmentation is proposed and we consider that we have a fragment i.e. portion of a document. Both fragments and documents are sent to the verification module where additionally to the incremental classifier it includes a correction module. The classifier predicts the classes of fragments and documents. The predicted class represents a context which is used as a query to search for similar contexts in the correction module and correct the segmentation and verification results. Corrections are sent back to the segmentation and verification modules to learn the correct classes. Results on real world databases show the effectiveness and stability of our approach.

A new approach for centerline extraction in handwritten strokes: an application to the constitution of a code book

We present in this paper a new method of analysis and decomposition of handwritten documents into glyphs (graphemes) and their associated code book. The different techniques that are involved in this paper are inspired by image processing methods in a large sense and mathematical models implying graph coloring. Our approaches provide firstly a rapid and detailed characterization of handwritten shapes based on dynamic tracking of the handwriting (curvature, thickness, direction, etc.) and also a very efficient analysis method for the categorization of basic shapes (graphemes). The tools that we have produced enable paleographers to study quickly and more accurately a large volume of manuscripts and to extract a large number of characteristics that are specific to an individual or an era.