Two bands wavelet based robust semi-blind image watermarking

Güvenilir resim damgalama metodu görünmeyen damgaları gömme işlemidir.Böylelikle bazı saldırı ve resim işleme metodları ile damgayı silmek zorlaşır.Daha önce yapılmış DWT resim damgalama makalesinde PRN değerleri damga olarak kullanılıp LL şeridi dışında kalan 3 şeritte daha önceden belirlenen basamaktan büyük olan katsayılara gömülmüştür.Bu makalede ise bu fikri geliştirip aynı damga iki şeride gömüldü. Deneylerimiz gösterdi ki bir grup saldırı için, gerçek damgadaki korelasyon değeri LL bantı için belirlenen katsayıdan büyük, bir diğer grup saldırı için ise HH bantındaki katsayıdan büyük olmaktadır.

İki şeritli dalgacık dönüşümü alanlarında yarı-kör resim damgalama

Robust image watermarking is the process of embedding an invisible watermark in an image in order to make it very difficult to remove the watermark after intentional attacks and normal audio/visual processes. A recent DWT image watermarking paper embeds a PRN sequence as a watermark in three bands, excluding the low pass subband, using coefficients that are higher than a given threshold. During watermark detection, all the coefficients higher than another threshold are chosen for correlation with the original watermark. In this paper, we extend the idea to embed the same watermark in two bands (LL and HH). Our experiments show that for one group of attacks, the correlation with the real watermark is higher than the threshold in the LL band and for another group of attacks, the correlation with the real watermark is higher than the threshold in the HH band.

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