Nonrigid recto-verso registration using page outline structure and content preserving warps

Authors:
Róisín Rowley-Brooke;François Pitié;Anil Kokaram
Affiliations:
Trinity College Dublin, Ireland;Trinity College Dublin, Ireland;Trinity College Dublin, Ireland
Venue:
Proceedings of the 2nd International Workshop on Historical Document Imaging and Processing
Year:
2013

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Abstract

Accurate registration of document recto and verso sides with bleed-through degradation is essential for accurate automatic non-blind bleed-through removal. This paper presents a registration method for documents with bleed-through degradation, and also an objective registration evaluation scheme. In the proposed method the two sides are first globally aligned using the outline of the page, and then a local grid point warp is applied using the sum of squared difference between both the image intensity and gradient fields as an error metric, and a content preserving smoothness penalty. The displacement fields of the combined global and local warps are then evaluated against manually registered full document image displacement fields and compared with recent document registration methods.