Effective geometric restoration of distorted historical documents for large-scale digitization

Yang, P, Antonacopoulos, A ORCID: https://orcid.org/0000-0001-9552-0233, Clausner, C ORCID: https://orcid.org/0000-0001-6041-1002, Pletschacher, S ORCID: https://orcid.org/0000-0003-0541-0968 and Qi, J 2017, 'Effective geometric restoration of distorted historical documents for large-scale digitization' , IET Image Processing, 11 (10) , pp. 841-853.

PDF (This paper is a postprint of a paper submitted to and accepted for publication in IET Image Processing and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at the IET Digital Library) - Accepted Version
Download (15MB) | Preview


Due to storage conditions and material’s non-planar shape, geometric distortion of the 2-D content is widely present in scanned document images. Effective geometric restoration of these distorted document images considerably increases character recognition rate in large-scale digitisation. For large-scale digitisation of historical books, geometric restoration solutions expect to be accurate, generic, robust, unsupervised and reversible. However, most methods in the literature concentrate on improving restoration accuracy for specific distortion effect, but not their applicability in large-scale digitisation. This paper proposes an effective mesh based geometric restoration system, (GRLSD), for large-scale distorted historical document digitisation. In this system, an automatic mesh generation based dewarping tool is proposed to geometrically model and correct arbitrary warping historical documents. An XML based mesh recorder is proposed to record the mesh of distortion information for reversible use. A graphic user interface toolkit is designed to visually display and manually manipulate the mesh for improving geometric restoration accuracy. Experimental results show that the proposed automatic dewarping approach efficiently corrects arbitrarily warped historical documents, with an improved performance over several state-of-the-art geometric restoration methods. By using XML mesh recorder and GUI toolkit, the GRLSD system greatly aids users to flexibly monitor and correct ambiguous points of mesh for the prevention of damaging historical document images without distortions in large-scale digitalisation.

Item Type: Article
Schools: Schools > School of Computing, Science and Engineering > Salford Innovation Research Centre
Journal or Publication Title: IET Image Processing
Publisher: http://www.theiet.org
Related URLs:
Funders: European Commission
Depositing User: Professor Apostolos Antonacopoulos
Date Deposited: 04 May 2017 07:55
Last Modified: 15 Feb 2022 21:56
URI: https://usir.salford.ac.uk/id/eprint/42263

Actions (login required)

Edit record (repository staff only) Edit record (repository staff only)


Downloads per month over past year