Digital Watermarking for Image AuthenticationBased on Combined DCT, DWT and SVD Transformation
This is an incremental improvement for digital image security applications.
The paper tackled image authentication by developing a hybrid digital watermarking method combining DWT, DCT, and SVD transformations, resulting in improved invisibility and robustness against attacks like geometric ones.
This paper presents a hybrid digital image watermarking based on Discrete Wavelet Transform (DWT), Discrete Cosine Transform (DCT) and Singular Value Decomposition (SVD) in a zigzag order. From DWT we choose the high band to embed the watermark that facilities to add more information, gives more invisibility and robustness against some attacks. Such as geometric attack. Zigzag method is applied to map DCT coefficients into four quadrants that represent low, mid and high bands. Finally, SVD is applied to each quadrant.