Spread Transform Watermarking for Digital Multimedia Using the Complex
Wavelet Domain · 2007
Complexwaveletsofferseveralimprovementsover� theirdiscretelysampledcounterpartssuchasimproved� directionalityandshiftinvarianceallowingforbetter� representationofimagefeatures.��Thishasimportant� implicationsforwatermarkembeddingandmodelling� ofthehumanvisualsystemthatisimportanttosatisfy� theimperceptibilityrequirementofwatermarking� systems.��Inadditionspreadtransformwatermarking� hasemergedasamethodofcombiningtheadvantages� ofspreadspectrumandquantizationbaseddatahiding� algorithms,�offeringimprovedlevelsofcapacityand� robustness.� � Thispaperappliesspreadtransform� embeddingandthecomplexwaveletdomaintothe� caseofgreyscale,� colourimageandvideo� watermarking.� �