WAVELET İLE DAYANIKLI MPEG VİDEO DAMGALAMA

Abstract

Yarı kör resim damgalama metodu PRN sayılarını DWT HH bant katsayılarından T1 basamağından büyük olanlarına damgalar. Saldırıya uğramış resim katsayıları başlangıç resim ile korelasyon yapılır. Damgayı bulmak için, basamak T2’den (T2 > T1 ) büyük olan katsayılar başlangıç resmi ile korelasyon edilir. Bu fikir LL ve HH bantlarına damgalama olarak geliştirilmiştir. Bu makalede ise bu daha önce geliştirdiğimiz bu fikri MPEG videoları için kullandık. Deney sonuçlarımız gösteriyorki bazı saldırılar için LL bantında damgalama, diğer bir grup saldırıda ise HH bantında damgalama daha iyi sonuç vermektedir.

Keywords

• damgalama, gömme ve çıkarma algoritmaları, PRNS, ayrık dalgacık dönüşümü (DWT), düşük geçiş bant, yatay, dikey ve köşe yüksek geçiş bant

ROBUST MPEG VIDEO WATERMARKING IN WAVELET DOMAIN

Abstract

A semi-blind image watermarking scheme embeds a pseudo random sequence in all the high pass DWT coefficients above a given threshold T1. The attacked DWT coefficients are then correlated with the original watermark. For watermark detection, all the coefficients higher than another threshold T2 (>T1) are chosen for correlation with the original watermark. This idea was extended to embed the same watermark in two bands (LL and HH). In this paper, we embed a pseudo random sequence in MPEG-1 using two bands (LL and HH). Our experiments show that for one group of attacks (i.e., JPEG compression, Gaussian noise, resizing, low pass filtering, rotation, and frame dropping), the correlation with the real watermark is higher than the threshold in the LL band, and for another group of attacks (i.e., cropping, histogram equalization, contrast adjustment, and gamma correction), the correlation with the real watermark is higher than the threshold in the HH band.

Keywords

• watermarking, embedding and detection algorithms, PRNS, discrete wavelet transform (DWT), lowpass band, horizontal, vertical, and diagonal highpass bands

References

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