Cheng-Chih Tsai

National University of Kaohsiung, Kao-hsiung-shih, Kaohsiung, Taiwan

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Publications (3)1.36 Total impact

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    Chih-Chin Lai, Cheng-Chih Tsai
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    ABSTRACT: The main objective of developing an image-watermarking technique is to satisfy both imperceptibility and robustness requirements. To achieve this objective, a hybrid image-watermarking scheme based on discrete wavelet transform (DWT) and singular value decomposition (SVD) is proposed in this paper. In our approach, the watermark is not embedded directly on the wavelet coefficients but rather than on the elements of singular values of the cover image's DWT subbands. Experimental results are provided to illustrate that the proposed approach is able to withstand a variety of image-processing attacks.
    IEEE Transactions on Instrumentation and Measurement 12/2010; · 1.36 Impact Factor
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    Chih-Chin Lai, Cheng-Chih Tsai, Shing-Tai Pan
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    ABSTRACT: In this paper, we introduce an image watermarking scheme using singular value decomposition (SVD) and improved micro-genetic algorithm (micro-GA). In an SVD-based watermarking scheme, the singular values of a cover image are modified by multiple scaling factors to embed the watermark image. Determining proper values of scaling factors to reduce visual artifacts is viewed as an optimization problem and we use the improved micro-GA to search the feasible solution. Experimental results are provided to illustrate the proposed approach is robust to common signal processing attacks.
    FUZZ-IEEE 2009, IEEE International Conference on Fuzzy Systems, Jeju Island, Korea, 20-24 August 2009, Proceedings; 01/2009
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    Chih-Chin Lai, Hsiang-Cheh Huang, Cheng-Chih Tsai
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    ABSTRACT: In this paper, we introduce a novel image watermarking scheme using singular value decomposition (SVD) and micro-genetic algorithm (micro-GA). In an SVD-based watermarking scheme, the singular values of the cover image are modified by multiple scaling factors to embed the watermark image. The proper values of scaling factors are optimized and obtained efficiently by means of the micro-GA. Experimental results are provided to illustrate the feasibility of the proposed approach.
    Intelligent Information Hiding and Multimedia Signal Processing, 2008. IIHMSP '08 International Conference on; 09/2008