Secure hybrid robust watermarking resistant against tampering and copy attack
Signal Processing - Special section: Security of data hiding technologies
Fragile image watermarking using a gradient image for improved localization and security
Pattern Recognition Letters
A feature-based robust digital image watermarking against geometric attacks
Image and Vision Computing
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The zero-bit watermarking technique uses the feature of images to generate watermarks to be authenticator of the digital multimedia, and makes host media without any distortion. It is highly desired in quality-sensitivity imagery, such as medical images and legal images, where even the small distortion introduced by embedding watermark is unacceptable. In this paper, we propose a zero-bit watermarking algorithm based on singular value decomposition (SVD) and digital wavelet transform (DWT). The host image is firstly performed by DWT, and then divided into non-overlap blocks. SVD factorization is performed on each block. Watermarks are generated by comprising the singular value of different block. Experimental results support that our method has strong robustness.