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28 January 2004 Novel digital watermarking method based on DWT and DCT
Hanqiang Cao, Guangxi Zhu, Hongyan Zhao, Xutao Li, Kaining Wu
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Proceedings Volume 5208, Mathematics of Data/Image Coding, Compression, and Encryption VI, with Applications; (2004) https://doi.org/10.1117/12.504087
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States
Abstract
Digital watermarking has been recently proposed as the mean for property right protection of digital products. In this paper we analyze the self-similarities of wavelet transform and present a new approach to embed a digital watermark into an image based on the qualified significant wavelet trees (QSWT) of discrete wavelet transform of the image for the purpose of protecting the copyright of the image. Our studies have shown that the watermarked image has a good quality of image, and such a watermark is difficult to detect and unchangeable without the appropriate user cryptogram.
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Hanqiang Cao, Guangxi Zhu, Hongyan Zhao, Xutao Li, and Kaining Wu "Novel digital watermarking method based on DWT and DCT", Proc. SPIE 5208, Mathematics of Data/Image Coding, Compression, and Encryption VI, with Applications, (28 January 2004); https://doi.org/10.1117/12.504087
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KEYWORDS
Digital watermarking
Discrete wavelet transforms
Digital imaging
Image quality
Mathematics
Wavelet transforms
Wavelets
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