PRN Based Watermarking Scheme for Color Images

Yıl 2006, Cilt: 5 Sayı: 10, 119 - 131, 01.12.2006

Ersin Elbaşı Ahmet M. Eskicioğlu

Öz

Anahtar Kelimeler

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PRN Based Watermarking Scheme for Color Images

Öz

Dayanikli resim damgalama gorunmeyen damganin kasitli saldiri ve goruntu islemlerinden sonra damganin silinmesini oldukca zorlastiran resimlere gomulmesi islemidir. DWT ile yapilan yari-kor resim damgalama yontemi LL bantini disari atip, digger uc bandin daha onceden belirlenen basmaktan buyuk katsayilarina gomme yapilir. Damga Ortaya cikarma esnasinda ise, uc banttaki T2’den buyuk katsayilarin gercek damga ile korelasyonu hesaplanir. Bizim genisletilmis DWT algoritmamizda ayni damgayi LL ve HH bantlarina farkli katsayilar kullanarak gommekteyiz. Damga tespitinde ise damgalanmis RGB (ve saldirilmis olmasi mumkun) resim YUV resim modeline cevrilir. Luminance tabakasi DWT’ye cevrildikten sonra T2’den buyuk LL ve HH bantlari katsayilari secilir. Sonraki adimda ise toplam Z degeri hesaplanir bu katsayilar icin. Eger Z degeri T degerinden buyuk ise resim damgalanmis, aksi takdirde damgalanmamis demektir. Deney sonuclarimiz LL bantta gommek bir grup saldiriya karsi dayanikli olurken, HH banta gomme diger bir grup saldiriya karsi dayanikli olmaktadir

Anahtar Kelimeler

Yarı- Kör Resim Damgalama, DWT, LL Bant, HH Bant, Saldırılar

Kaynakça

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