Semantic object watermark re-synchronization based on skeleton vertex corresponds

Tzouveli, P; Raftopoulos, K; Ntalianis, K; Kollias, S

dc.contributor.author	Tzouveli, P	en
dc.contributor.author	Raftopoulos, K	en
dc.contributor.author	Ntalianis, K	en
dc.contributor.author	Kollias, S	en
dc.date.accessioned	2014-03-01T02:46:59Z
dc.date.available	2014-03-01T02:46:59Z
dc.date.issued	2010	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/32969
dc.subject	Eulerian tour	en
dc.subject	MAT	en
dc.subject	Object based watermarking	en
dc.subject	Skeleton	en
dc.subject.other	Block-based approaches	en
dc.subject.other	Caltech	en
dc.subject.other	Eulerian	en
dc.subject.other	Geometric distortion	en
dc.subject.other	Image blocks	en
dc.subject.other	Image objects	en
dc.subject.other	MAT	en
dc.subject.other	Object based watermarking	en
dc.subject.other	Rectangular grids	en
dc.subject.other	Resynchronization	en
dc.subject.other	Semantic objects	en
dc.subject.other	Shape information	en
dc.subject.other	Skeleton	en
dc.subject.other	Watermark synchronization	en
dc.subject.other	Musculoskeletal system	en
dc.subject.other	Semantics	en
dc.subject.other	Watermarking	en
dc.title	Semantic object watermark re-synchronization based on skeleton vertex corresponds	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1145/1877972.1877979	en
heal.identifier.secondary	http://dx.doi.org/10.1145/1877972.1877979	en
heal.publicationDate	2010	en
heal.abstract	Plain rotation, scaling, and/or translation of an image can lead to loss of watermark synchronization and thus authentication failure. The block based approaches in particular are sensitive to geometric distortions due to the need for repositioning the block's rectangular grid. In this paper, we propose a novel block based approach for watermarking image objects in a way that is invariant to RST distortions. With the term ""image object"" we refer to semantically contiguous parts of images that have a specific contour boundary. The proposed approach is based on shape information since the watermark is embedded in image blocks, the location and orientation of which is defined by Eulerian tours that are appropriately arranged in layers, around the object's skeleton. The skeleton of the object (MAT transform) is defined by the shape of its boundary and not only is invariant to RST transformations but is also robust to cropping, clipping and other common deformation attacks. Results on the Caltech database are reported, showing the advantages of the proposed scheme.	en
heal.journalName	MiFor'10 - Proceedings of the 2010 ACM Workshop on Multimedia in Forensics, Security and Intelligence, Co-located with ACM Multimedia 2010	en
dc.identifier.doi	10.1145/1877972.1877979	en
dc.identifier.spage	13	en
dc.identifier.epage	18	en