The object of the research presented in this thesis was the development of a new watermarking algorithm for digital images operating in the frequency domain: the method embeds a pseudo-random sequence of real numbers in a selected set of DCT coefficients of the image. After embedding, the watermark is adapted to the image by exploiting the masking characteristics of the Human Visual System, thus ensuring the watermark invisibility. By exploiting the statistical properties of the embedded sequence, the mark can be reliably extracted without resorting to the original uncorrupted image.
A DCT-Domain Watermarking System for Copyright Protection of Digital Images / A. Piva. - (1999).
A DCT-Domain Watermarking System for Copyright Protection of Digital Images
PIVA, ALESSANDRO
1999
Abstract
The object of the research presented in this thesis was the development of a new watermarking algorithm for digital images operating in the frequency domain: the method embeds a pseudo-random sequence of real numbers in a selected set of DCT coefficients of the image. After embedding, the watermark is adapted to the image by exploiting the masking characteristics of the Human Visual System, thus ensuring the watermark invisibility. By exploiting the statistical properties of the embedded sequence, the mark can be reliably extracted without resorting to the original uncorrupted image.
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