A New Physically Motivated Warping Model for Form Drop-Out

Documents scanned by sheet-fed scanners often exhibit distortions due to the feeding and scanning mechanism. This paper presents a new model, motivated by the distortions observed in such documents. Numerical problems affecting the use of this model are addressed using an approximated model which is easier to estimate correctly. We demonstrate results showing the robustness and accuracy of this model on sheet-fed scanners output, and relate to existing techniques for registration and drop-out of structured forms.