A Multiscale Approach to Restoring Scanned Color Document Images with Show-Through Effects
ICDAR '03 Proceedings of the Seventh International Conference on Document Analysis and Recognition - Volume 1
ICPR '04 Proceedings of the Pattern Recognition, 17th International Conference on (ICPR'04) Volume 1 - Volume 01
Independent component analysis for document restoration
International Journal on Document Analysis and Recognition
International Journal on Document Analysis and Recognition
Low quality document image modeling and enhancement
International Journal on Document Analysis and Recognition
ICDAR '09 Proceedings of the 2009 10th International Conference on Document Analysis and Recognition
Registration and Enhancement of Double-Sided Degraded Manuscripts Acquired in Multispectral Modality
ICDAR '09 Proceedings of the 2009 10th International Conference on Document Analysis and Recognition
A Variational Approach to Degraded Document Enhancement
IEEE Transactions on Pattern Analysis and Machine Intelligence
DAS'06 Proceedings of the 7th international conference on Document Analysis Systems
Show-through cancellation in scans of duplex printed documents
IEEE Transactions on Image Processing
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In this paper, we approach the removal of back-to-front interferences from scans of double-sided documents as a blind source separation problem, and extend our previous linear mixing model to a more effective nonlinear mixing model. We consider the front and back ideal images as two individual patterns overlapped in the observed recto and verso scans, and apply an unsupervised constrained maximum likelihood technique to separate them. Through several real examples, we show that the results obtained by this approach are much better than the ones obtained through data decorrelation or independent component analysis. As compared to approaches based on segmentation/classification, which often aim at cleaning a foreground text by removing all the textured background, one of the advantages of our method is that cleaning does not alter genuine features of the document, such as color or other structures it may contain. This is particularly interesting when the document has a historical importance, since its readability can be improved while maintaining the original appearance.