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Robust Non-Oblivious Dwt-Adaptive Invisible Digital Watermarking

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Author(s): Sri K.Naga Prakash | Ms.G.Sindhuri | Mr.K.Akshay | Mr.G.Apuroop

Journal: International Journal on Computer Science and Engineering
ISSN 0975-3397

Volume: 3;
Issue: 12;
Start page: 3715;
Date: 2011;
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Keywords: watermark | non-oblivious | imperceptible | DiscreteWavelet Transform(DWT) | Human Visual System(HVS)

ABSTRACT
The main idea of this paper is embedding invisible watermark into an image. The advantage of this method over previous works is that it is easy to embed and robust to attacks. Non-oblivious detection technique is used. This is implemented using matlab and is verified for the robustness and results with previous are compared. Here we introduced a factor k as scaling factor for the watermark.To make the embedding more strong divide the image into different sublevels and each sublevel is again divided into sub bands and watermark is embedded into each sub band except the low frequency band . TO achieve this we adapted the transform domain method using the DWT .To Hvs minute changes in high frequencies are imperceptible ,hence based on this we perform invisible watermarking. .We use dwt transform domain as it is better to embed the watermark in transform domain, selecting only perceptually significant coefficients, because those are the most likely to survive compression. We use a non-oblivious technique for detection of the watermark and extract it from the cover image

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