Video mosaicing for document imaging
Noboru Nakajima, Akihiko Iketani, Tomokazu Sato, Masayuki Kanbara, Naokazu Yokoya, Sei Ikeda · 2007
This paper describes a real-time video mosaicing method for digitizing paper documents with mobile and low-resolution video cameras. Our proposed method is based on the structure-from-motion technique with real-time processing. Therefore, it can dewarp an im-age suffering from perspective deformation caused by a slanted and curved document surface. The curved surfaces are reconstructed as an expanded flat image by 3D polynomial surface regression and projection onto a flat mosaic plane. The order of the polynomial is automatically determined according to the geometric AIC. Moreover, the real-time scanning and reconstruc-tion process offers interactive user instruction on the style of user’s camera handling, such as appropriate-ness of camera posture and scanning speed. Manual camera scanning for video mosaicing captures a point on the target multiple times and that allows other me-rits. They include super-resolution and shading correc-tion. The experiments demonstrated the feasibility of our approach. 1.