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Considering the simple and weak structure of binary texts, this paper proposes a novel algorithm which combines the methods of Block Partition, Discrete Cosine Transform (DCT) and pixel flipping. Based on appropriate block partition, the matrix of each block's characteristic values is transformed into the DCT domain, and a DCT coefficient matrix generated. Then, some high-frequency DCT coefficients...
Halftone image watermarking techniques that allow automated extraction of the embedded watermark data are useful in a variety of document security and workflow applications. The print-scan process inherent in these applications introduces distortions whose characteristics exhibit a strong spatial dependence on the cover image in which the data is embedded. In this paper, we demonstrate that a characterization...
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