Hiding digital watermarks using multiresolution wavelet transform
Ming-Shing Hsieh; Din-Chang Tseng; Yong-Huai Huang
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 5, Oct 2001 Page(s):875 - 882
Digital Object Identifier 10.1109/41.954550
Summary:In this paper, an image accreditation technique by embedding
digital watermarks in images is proposed. The proposed method for the
digital watermarking is based on the wavelet transform. This is unlike
most previous work, which used a random number of a sequence of bits as
a watermark and where the watermark can only be detected by comparing an
experimental threshold value to determine whether a sequence of random
signals is the watermark. The proposed approach embeds a watermark with
visual recognizable patterns, such as binary, gray, or color image in
images by modifying the frequency part of the images. In the proposed
approach, an original image is decomposed into wavelet coefficients.
Then, multi-energy watermarking scheme based on the qualified
significant wavelet tree (QSWT) is used to achieve the robustness of the
watermarking. Unlike other watermarking techniques that use a single
casting energy, QSWT adopts adaptive casting energy in different
resolutions. The performance of the proposed watermarking is robust to a
variety of signal distortions, such as JPEG, image cropping, sharpening,
median filtering, and incorporating attacks
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