Method for embedding electronic watermark, decoding method, and devices for the same
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United States of America Patent
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Apr 21, 2009
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N/A
app pub date -
Jan 24, 2000
filing date -
Jan 25, 1999
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Expired
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Abstract
The method extracts a plurality of blocks from a master image, processes image data corresponding to each block by orthogonal transform, compares coefficients of adjoining blocks with each other, and modifies the order of magnitude of the coefficients, based on bit information to be embedded. The bit information to be embedded is constructed as a basic pattern, which is generated, for example, by the density pattern method. The basic pattern is embedded in image data iteratively. The process of iteratively embedding the basic pattern enhances the resistance against various attacks.
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