A Reversible Watermarking Algorithm Resistant to Image Geometric Transformation

Thisarticleproposesanovelrobustreversiblewatermarkingalgorithm.Theproposedwatermarking schemeisreversiblebecausetheoriginalimagecanberecoveredafterextractingwatermarksfrom thewatermarkedimage,aslongasitisnotprocessedbyanattacker.Theschemeisrobustbecause watermarkscanstillbeextractedfromwatermarkedimages,evenifitisundergonesomemaliciousor normaloperationslikerotationandJPEGcompression.Itfirstselectstwocircles,whicharecentred atthecentroidandthecentreofimage.Then,statisticquantitiesofthesetwocirclesareemployedfor robustwatermarkembeddingbyalteringthepixels’value.Thesideinformationgeneratedbyabove embeddingprocesswillbeembeddedasfragilewatermarksatanotherstagetoensuretherecovery oforiginalimage.Experimentalresultsverifythehighperformanceoftheproposedalgorithmin resistingvariousattacks,includingJPEGcompressionandgeometrictransformation. KeyWoRDS Centre, Centroid, Histogram Shifting, Reversible Watermarking, Robust Watermarking

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