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The Adaptive Content and Contrast-aware Technique for Visible Watermarking

Authors:
Min-Jen Tsai
Jung Liu
Ching-Hua Chuang

Keywords: Image Watermarking; HVS; CSF; wavelet

Abstract:
The efficiency of a digital image watermarking technique depends on the preservation of visually significant information. This is attained by embedding the watermark transparently with the maximum possible strength. This paper presents an Adaptive approach for still image in which the watermark embedding process employs the wavelet transform and incorporates Human Visual System (HVS) characteristics. The sensitivity of a human observer to contrast with respect to spatial frequency is described by the Contrast Sensitivity Function (CSF). The strength of the watermark within the decomposition sub-bands is adjusted according to this sensitivity. Moreover, the watermark embedding process is carried over the sub-band coefficients by the analysis of Noise Visibility Function (NVF) in which the distortions are less noticeable. Such unique design is novel and the experimental evaluation of the proposed method shows excellent results in terms of robustness and transparency.

Pages: 38 to 42

Copyright: Copyright (c) IARIA, 2011

Publication date: October 23, 2011

Published in: conference

ISSN: 2163-9027

ISBN: 978-1-61208-166-3

Location: Barcelona, Spain

Dates: from October 23, 2011 to October 29, 2011