Marco Corvi and Gianluca Nicchiotti,
Wavelet Based Image Watermarking for Copyright Protection,
In The 10th Scandinavian Conference on Image Analysis (SCIA'97),
Lappeenranta, Finland, pp. 157-163, June 1997.
Marco Corvi and Gianluca Nicchiotti,
Wavelet Based Image Watermarking for Copyright Protection,
In The 10th Scandinavian Conference on Image Analysis (SCIA'97),
Lappeenranta, Finland, pp. 157-163, June 1997.In this work we present a new watermarking method based on the discrete wavelet transform of the image. Our approach is a kind of spread spectrum technique: the watermark is encoded as a low-intensity redundant signal on a broad-band channel (the image spectrum). Wavelet transform is used to select perceptually relevant frequencies in the image and to exploit masking phenomena. Our approach proved to be robust against a plethora of image transformations, including printing and re-scanning the image and compressions. Numerical results will be presented.