NCSR Geometric Correction: Page Curl
This tool rectifies document images which suffer from warping and perspective distortions that deteriorate the performance of current OCR approaches.
The page curl process aims to correct distortions sometimes observed in document images due to the physical characteristics of printed material (e.g. bound volumes), the camera setup, or environmental conditions (e.g. humidity that can cause page shrinking over time).
At a first step, this tool applies a rough transformation model that maps the projection of a curved surface to a 2D rectangular area. This initial transformation is then fine-tuned by the detection of individual words within the print space.
- IMPACT D-TR1 Image Enhancement Toolkit.pdf
- Rahnemoonfar, M. and A. Antonacopoulos. “Restoration of Arbitrarily Warped Historical Document Images Using Flow Lines“. ICDAR2011, 18-21 September, Beijing, China.
- Gatos, B.
IMPACT Tools Developed by NCSR. IMPACT Final Conference 2011, 24-25 October, London, UK
- Willms, L.