A DCT based watermarking scheme surviving JPEG compression

• Main Authors: Pei-Feng Shiu, 徐培峯
• Other Authors: Chia-Chen Lin
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/02411822415288436323

碩士 === 靜宜大學 === 資訊工程學系 === 99 === In this thesis, a DCT-based watermarking technique is proposed. This scheme is designed to increase its robustness of hidden watermark so that the hidden watermark can withstand JPEG compression attack. To achive our objective, the proposed watermark scheme embeds watermark into the DCT coefficients. To remain the visual quality of watermarked images, only low-frequency DCT coefficients are selected to carry hidden watermark by the concept of mathematical remainder. To enhance the robustness of the watermark, a voting mechanism is applied in the scheme. Experimental results confirm that the robustness of hidden watermark against JPEG compression with our proposed scheme is better than that of Lin et al.’s scheme and Patra et al.’s scheme.