Articolo in rivista, 2007, ENG, 10.1007/s10032-006-0015-z
Tonazzini A.; Salerno E.; Bedini L.
CNR-ISTI, Pisa, Italy; CNR-ISTI, Pisa, Italy; CNR-ISTI, Pisa, Italy
Ancient documents are usually degraded by the presence of strong background artifacts. These are often caused by the so-called bleed-through effect, a pattern that interferes with the main text due to seeping of ink from the reverse side. A similar effect, called show-through and due to the nonperfect opacity of the paper, may appear in scans of even modern, well-preserved documents. These degradations must be removed to improve human or automatic readability. For this purpose, when a color scan of the document is available, we have shown that a simplified linear pattern overlapping model allows us to use very fast blind source separation techniques. This approach, however, cannot be applied to grayscale scans. This is a serious limitation, since many collections in our libraries and archives are now only available as grayscale scans or microfilms. We propose here a new model for bleed-through in grayscale document images, based on the availability of the recto and verso pages, and show that blind source separation can be successfully applied in this case too. Some experiments with real-ancient documents are presented and described.
International journal on document analysis and recognition (Internet) 10 , pp. 17–25
I.4.4 Restoration, Blind source separation
Bedini Luigi, Salerno Emanuele, Tonazzini Anna
ISTI – Istituto di scienza e tecnologie dell'informazione "Alessandro Faedo"
ID: 68351
Year: 2007
Type: Articolo in rivista
Creation: 2009-06-16 00:00:00.000
Last update: 2018-01-25 10:34:07.000
CNR authors
External IDs
CNR OAI-PMH: oai:it.cnr:prodotti:68351
DOI: 10.1007/s10032-006-0015-z
ISI Web of Science (WOS): 000247735200002