Document image dewarping using robust estimation of curled text lines

Digital cameras have become almost ubiquitous and their use for fast and casual capturing of natural images is unchallenged. For making images of documents, however, they have not caught up to flatbed scanners yet, mainly because camera images tend to suffer from distortion due to the perspective an...

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Bibliographic Details
Published inEighth International Conference on Document Analysis and Recognition (ICDAR'05) pp. 1001 - 1005 Vol. 2
Main Authors Ulges, A., Lampert, C.H., Breuel, T.M.
Format Conference Proceeding
LanguageEnglish
Published IEEE 2005
Subjects
Digital cameras
Digital photography
Hardware
Image databases
Image storage
Nonlinear distortion
Optical character recognition software
Robustness
Software packages
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Summary:Digital cameras have become almost ubiquitous and their use for fast and casual capturing of natural images is unchallenged. For making images of documents, however, they have not caught up to flatbed scanners yet, mainly because camera images tend to suffer from distortion due to the perspective and are therefore limited in their further use for archival or OCR. For images of non-planar paper surfaces like books, page curl causes additional distortion, which poses an even greater problem due to its nonlinearity. This paper presents a new algorithm for removing both perspective and page curl distortion. It requires only a single camera image as input and relies on a priori layout information instead of additional hardware. Therefore, it is much more user friendly than most previous approaches, and allows for flexible ad hoc document capture. Results are presented showing that the algorithm produces visually pleasing output and increases OCR accuracy, thus having the potential to become a general purpose preprocessing tool for camera based document capture.
ISBN:9780769524207
0769524206
ISSN:1520-5363
2379-2140
DOI:10.1109/ICDAR.2005.90