Importance

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Abstract

An electronic watermarking data insertion/detection device inserts plural kinds of electronic watermarking data in a block by entering digital images as image data, converting the entered image data into frequency components with the DCT or the like for each block of pixels, fetching the converted frequency components (DCT coefficients), and inserting the fetched DCT coefficients into electronic watermarking data according to contents of an electronic watermarking data insertion DCT coefficient table. Further, the device detects the inserted electronic watermarking data by calculating a degree of a similarity between extracted electronic watermarking data and electronic watermarking data corresponding to an ID number shown by the electronic watermarking data extraction DCT coefficient designation table.

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First Claim