Digital Watermarking for Image AuthenticationBased on Combined DCT, DWT and SVD Transformation

TL;DR

This paper proposes a hybrid digital watermarking technique combining DWT, DCT, and SVD to enhance image authentication, focusing on robustness and invisibility against geometric attacks.

Contribution

It introduces a novel hybrid approach using DWT, DCT, and SVD with a zigzag mapping method for improved watermark robustness and invisibility.

Findings

Enhanced robustness against geometric attacks.

Improved invisibility of the watermark.

Effective embedding in high-frequency DWT bands.

Abstract

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.