Suppression of non-text components in handwritten document images
Ram Sarkar, Sanjay Moulik, Nibaran Das, Subhadip Basu, Mita Nasipuri, Mahantapas Kundu · 2011
Document layout analysis is a pre-processing step to convert handwritten/printed documents into electronic form through Optical Character Recognition (OCR) system. Handwritten documents are usually unstructured i.e. they do not have a specific layout and most documents may contain some non-text regions e.g. graphs, tables, diagrams etc. Therefore, such documents cannot be directly given as input to the OCR system without suppressing the non-text regions in the documents. The traditional Run Length Smoothing Algorithm (RLSA) does not produce good results for handwritten document pages, since the text components in it have lesser pixel density than those in printed text. In present work, a modified RLSA, called Spiral Run Length Smearing Algorithm (SRLSA), is applied to suppress the non-text components from text ones in handwritten document images. The components in the document pages are then classified into text/non-text groups using a Support Vector Machine (SVM) classifier. The method shows a success rate of 83.3% on a dataset of 3000 components.