標題: A visible watermarking algorithm based on the content and contrast aware (COCOA) technique
作者: Tsai, Min-Jen
資訊管理與財務金融系 註:原資管所+財金所
Department of Information Management and Finance
關鍵字: CSF;Human Vision System;NVF;Visible watermarking;Wavelet transform;Copyright protection;Image inpainting;Image recovery
公開日期: 1-Jul-2009
摘要: A novel visible watermarking algorithm based on the content and contrast aware (COCOA) technique with the consideration of Human Visual System (HVS) model is presented in this study. In order to determine the optimal watermark locations and strength at the watermark embedding stage, the COCOA visible watermarking utilizes the global and local characteristics of the host and watermark images in the discrete wavelet transform (DWT) domain. To achieve the best tradeoff between the embedding energy of watermark and the perceptual translucence, the utilization of contrast-sensitive function, noise visible function of perceptual model, and the basis function amplitudes of DWT coefficients are fine tuned, for the best quality of perceptual translucence and noise reduction of the COCOA algorithm. The experimental results demonstrate that COCOA technique not only provides high PSNR values for the watermarked images, but also preserves the watermark visibility under various signal processing operations, especially the watermark removal attack. (C) 2009 Elsevier Inc. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jvcir.2009.03.011
http://hdl.handle.net/11536/7049
ISSN: 1047-3203
DOI: 10.1016/j.jvcir.2009.03.011
期刊: JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION
Volume: 20
Issue: 5
起始頁: 323
結束頁: 338
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