Istituto di Scienza e Tecnologie dell'Informazione     
Martinelli F., Tonazzini A. Simple automatic procedures to enhance low-quality ancient color manuscripts. In: SIPA 2011 - IASTED International Conference Signal and Image Processing and Applications (Crete, Greece, 22 - 24 June 2011). Proceedings, pp. 151 - 158. IASTED, 2011.
Frequent degradation in ancient manuscripts are seethrough interferences and poor contrast between the written text and the background, which compromise or make difficult their legibility. Normally, these manuscripts appear colored due to ageing factors such as yellowing of the paper or diffusion and oxidation of the ink chemical components. Very often, these degradations produce monochrome manuscripts where a single color is predominant. Scholars and archivists are nowadays interested in digital image processing techniques to improve their readability, but might desire to preserve their general appearance as well, since this is a mark of their history. In this paper we propose very simple and fast procedures to remove interferences and enhance the contrast in monochrome manuscripts while preserving their color. These procedures are based on the enhancement of the only luminance component Y of the Y CbCr representation of the original RGB manuscript image, and make also use of the CMYK representation. Our method favorably compares with tools of commercial software packages for image manipulation, which, furthermore, often requires expert user intervention.
DOI: 10.2316/P.2011.738-041
Subject Document Analysis and Enhancement
Color Spaces
Color Image Processing
I.4.3 Enhancement
I.4.4 Restoration

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