TY  - CONF
AU  - Alicia Fornes
AU  - Xavier Otazu
AU  - Josep Llados
A2  - ICDAR
PY  - 2013//
TI  - Show through cancellation and image enhancement by multiresolution contrast processing
BT  - 12th International Conference on Document Analysis and Recognition
SP  - 200
EP  - 204
N2  - Historical documents suffer from different types of degradation and noise such as background variation, uneven illumination or dark spots. In case of double-sided documents, another common problem is that the back side of the document usually interferes with the front side because of the transparency of the document or ink bleeding. This effect is called the show through phenomenon. Many methods are developed to solve these problems, and in the case of show-through, by scanning and matching both the front and back sides of the document. In contrast, our approach is designed to use only one side of the scanned document. We hypothesize that show-trough are low contrast components, while foreground components are high contrast ones. A Multiresolution Contrast (MC) decomposition is presented in order to estimate the contrast of features at different spatial scales. We cancel the show-through phenomenon by thresholding these low contrast components. This decomposition is also able to enhance the image removing shadowed areas by weighting spatial scales. Results show that the enhanced images improve the readability of the documents, allowing scholars both to recover unreadable words and to solve ambiguities.
SN  - 1520-5363
L1  - http://refbase.cvc.uab.es/files/FOL2013.pdf
UR  - http://dx.doi.org/10.1109/ICDAR.2013.47
N1  - DAG; 602.006; 600.045; 600.061; 600.052;CIC
ID  - Alicia Fornes2013
ER  -