Sayısal Görüntülerin Telif Hakkının Korunması İçin İris Tabanlı Biyometrik Damgalama Yaklaşımı

Öz

Modern teknolojik gelişmeler, görüntü, ses, video ve metin gibi multimedya verilerinin yasadışı kopyalarının üretilmesini çok kolay hale getirmiştir. Sayısal damgalama teknikleri, telif hakkı korumalı veri dosyalarının yasadışı kullanımını önlemek amacıyla telif hakkı bilgilerinin korunacak ortama sayısal olarak gömülmesini amaçlar. Bu çalışmada, biyometrik verilerle sayısal görüntünün damgalanması yöntemi ele alınmıştır. Geleneksel damga yerine biyometrik özelliklerin kullanımı damgalama şemasının güvenliğini artırır. Bu çalışmada daha güvenli olması ve kopyalanmasının daha zor olması sebebiyle iris biyometrik verisi tercih edilmiştir. Kişinin göz görüntüsünden üretilen iris şablonu ayrık kosinüs dönüşümü ile ikili koda dönüştürülür. Bu ikili kod, orijinal görüntüye yeniden dağıtılmış değişmez ayrık dalgacık dönüşümü ve Schur ayrıştırma yardımıyla gömülür. İkili kodun gömülmesi için kullanılan bloklar standart sapma değerlerine bağlı olarak seçilir. Deneysel sonuçlar önerilen yöntemin algısal kalitesinin yüksek olduğunu ortaya koymuştur. Ayrıca farklı görüntü işleme atakları ve geometrik ataklar karşısında dayanıklılığı oldukça yüksek bulunmuştur.

Anahtar Kelimeler

• Biyometrik Damgalama
• Yeniden Dağıtılmış Değişmez Ayrık Dalgacık Dönüşümü
• Schur Ayrıştırma
• Dayanıklılık

Iris-Based Biometric Watermarking Approach for Copyright Protection of Digital Images

Öz

Modern technological advances has made it very easy to produce illegal copies of multimedia data such as image, audio, video, or text. Digital watermarking techniques aim to digitally embed copyright information into the media to be protected in an attempt to prevent illegal use of copyright protected data files. In this study, the method of digital image watermarking with biometric data is discussed. The use of biometric features instead of traditional watermarks increases the security of the watermarking scheme. Iris biometric data is preferred in this study because it is more secured and more difficult to copy. The iris template produced from the eye image of the person is converted into binary code via discrete cosine transform. This binary code is embedded into the cover image with the help of the redistributed invariant discrete wavelet transform and Schur decomposition. The blocks used for embedding binary code are selected based on their standard deviation values. Experimental results revealed that the perceptual quality of the proposed method is high. In addition, it is found to be highly robust against different types of image processing attacks as well as geometrical attacks. Keywords: Biometric Watermarking, Redistributed Invariant Discrete Wavelet Transform, Schur Decomposition, Robustness

Anahtar Kelimeler

• Biometric Watermarking
• Redistributed Invariant Discrete Wavelet Transform
• Schur Decomposition
• Robustness

Kaynakça

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