HP Labs Technical Reports

Robust Public Key Watermarking of Digital Images

Natarajan, Balas

HPL-97-118

Keyword(s): robust; watermarking; invisible

Abstract: This paper addresses the problem of watermarking a digital image, in order to detect or verify ownership. An invisible and resilient watermark is one that is not ordinarily visible and is robust in the face of common image manipulations such as lossy compression, scaling, cropping, rotation, reflection, and brightness/contrast adjustment. A watermarking scheme is non-invertible if a valid watermark cannot be subtracted from an image, within the framework of the scheme. We propose an invisible, resilient and non- invertible watermarking scheme that uses public key signatures, and is computationally inexpensive to create, detect and verify.

10 Pages

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