A New Hybrid DWT-DCT Algorithm for Digital Image Watermarking
نویسندگان
چکیده
Watermarking is the requirement of today‟s digital media. Embedding of watermark provides security against piracy & attacks .Watermarking is also useful for provide owner identification to digital media. Inthis Research papera new algorithm, for digital image, based on Hybrid DWT-DCT Transformation is proposed. A host image (grey scale) is initially DWT transformed up to 3-level.Thencomputation of DCT transform on selected sub bands from DWT transform is done. Watermark image is embedded in the 4*4 block of DCT blocks. The reverse procedure is use to extraction watermark. Resultsshowsthathighimperceptibilityis achieved during whole experiment which is applied to different formats of images. As compare of same kind of hybrid algorithms it has higher perceptible. KeywordsWatermark, DCT-DWT, MAE, PSNR, Attacks
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