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Digital watermarking is extensively used in ownership authentication andcopyright protection. In this paper, we propose an efficient thresholdingscheme to improve the watermark embedding procedure in an image. For theproposed algorithm, watermark casting is performed separately in each block ofan image, and embedding in each block continues until a certain structuralsimilarity threshold is reached. Numerical evaluations demonstrate that ourscheme improves the imperceptibility of the watermark when the capacity remainsfix, and at the same time, robustness against attacks is assured. The proposedmethod is applicable to most image watermarking algorithms. We verify thisissue on watermarking schemes in Discrete Cosine Transform (DCT), wavelet, andspatial domain.

An Improvement Technique based on Structural Similarity Thresholding for Digital Watermarking