Show-Through Cancellation in Scans of

In scanning pages with double-sided printing, often the printing on the back-side shows through in the scan of the front-side because the paper is not completely opaque. This show- through is an undesirable artifact that one would like to remove. In this paper, the phenomenon of show-through is analyzed using first physical principles to obtain a simplified mathematical model. The model is linearized using suitable transformations and simpli- fying approximations. Based on the linearized model, an adaptive linear filtering scheme is developed for the electronic removal of show-through using scans of both sides of the document. Experi- mental results demonstrating the effectiveness of the method de- veloped are presented. Index Terms—Adaptive filtering, restoration, scanning, show- through.