Tekil Değer Ayrışımı Tabanlı Yeni Bir İmge Kimliklendirme Yöntemi

Türker TUNCER
371 69

Öz


İmgelerde kimlik doğrulama için kırılgan damgalama yöntemleri yaygın olarak kullanılmaktadır. Kullanılan kırılgan damgalama yöntemlerinde genellikle eşitlik biti, sır paylaşımı ve özet fonksiyonu gibi yöntemler kullanarak damganın kırılganlığı arttırılmaktadır. Bu makalede tekil değer ayrışımı (TDA) ve blok tabanlı yeni bir veri gizleme tekniğiyle imge kimlik doğrulama işlemi önerilmiştir. Önerilen yöntemde blok genişliği kullanıcıya bağlıdır. Bu uygulama da 2 x 2, 4 x 4 ve 8 x 8 boyutunda bloklar kullanılmıştır. Her bir bloktan TDA kullanılarak özellikler elde edilmiştir. Elde edilen özellikler blok büyüklüğüne göre basamaklandırılmış ve bloğa gömülmüştür. Bu yöntem ön işlem, özellik çıkarımı, basamaklama ve veri gizleme aşamalarından oluşmaktadır. Veri çıkarma aşamasında veri çıkarma ile veri doğrulama ve saldırı tespiti aşamaları yer almaktadır. Yöntemin görsel kalitesi tepe sinyal gürültü oranı (TPGO -  PSNR) ile ölçülmüştür. Deneysel sonuçlar önerilen metodun başarılı olduğunu göstermiştir.


Anahtar kelimeler


İmge Kimliklendirme; TDA; Kırılgan Damgalama; Veri Gizleme.

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