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Proceedings Paper

Blind watermarking system for digital images in the wavelet domain
Author(s): Alessandra Lumini; Dario Maio
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Paper Abstract

Image watermarking has been the topic of much research and it is now widely accepted that the watermark should be placed in perceptually significant components of an image, in order to be robust against common signal distortions and malicious attacks. This choice makes the watermark potentially visible, therefore only slight modifications to the original image are allowed with a low loss of quality. In this work we propose a scheme where the energy of the watermark embedded depends on the image to be marked, thus fitting image capacity. The three fundamental stages of our scheme are: a watermark sequence generation as zero-mean, unit-variance Gaussian noise, an embedding procedure working in the DWT domain, and watermark detection performed by correlation and not requiring the original image. The experimental results prove that the method is resistant to JPEG compression up to a quality factor of 10%, to blurring and median filtering, to cropping and stretching; moreover the watermark is not perceivable for many different kinds of images, including cartoons.

Paper Details

Date Published: 9 May 2000
PDF: 12 pages
Proc. SPIE 3971, Security and Watermarking of Multimedia Contents II, (9 May 2000); doi: 10.1117/12.385008
Show Author Affiliations
Alessandra Lumini, Univ. degli Studi di Bologna (Italy)
Dario Maio, Univ. degli Studi di Bologna (Italy)

Published in SPIE Proceedings Vol. 3971:
Security and Watermarking of Multimedia Contents II
Ping Wah Wong; Edward J. Delp, Editor(s)

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