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Proceedings Paper

Perceptual mask estimation from watermarked images
Author(s): Sergi Ventosa; Elisa Sayrol; Josep Vidal
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Paper Abstract

In this paper, the influence of the estimated perceptual mask from the watermarked image is analyzed with the purpose of decreasing the probability of error in detection. We concentrate on a well known perceptual model that has been applied to 8x8 block-wise DCT coefficients. A new procedure based on extracting the mask of the original image from the watermarked image is developed. A closed form solution is derived to estimate the coefficients of the original image. The mask in then computed from these coefficients. The model can also be recursively estimated. Results show that the proposed solution outperforms those solutions based on not considering at all the perceptual mask in detection or on applying the same procedure that was used when embedding the watermark but using the watermarked image instead of the original image.

Paper Details

Date Published: 20 June 2003
PDF: 8 pages
Proc. SPIE 5020, Security and Watermarking of Multimedia Contents V, (20 June 2003); doi: 10.1117/12.476855
Show Author Affiliations
Sergi Ventosa, Univ. Politecnica de Catalunya (Spain)
Elisa Sayrol, Univ. Politecnica de Catalunya (Spain)
Josep Vidal, Univ. Politecnica de Catalunya (Spain)

Published in SPIE Proceedings Vol. 5020:
Security and Watermarking of Multimedia Contents V
Edward J. Delp; Ping Wah Wong, Editor(s)

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