International Business Machines Corporation

Norishiqe Morimoto

Kohichi Kamijoh

Satoko Tonegawa

It is one object of the present invention to prevent embedded verification information from being lost even when a quantization process is performed after verification information has been embedded. A pre-embedding portionconverts a image data value so that quantized values not changing by error introduced through the embedding process. A hash value calculatorcalculates a hash value using image data and key information, and a hash value embedding portionembeds the hash value in the image data. An output format converterquantizes the image data in which the hash value is embedded, and generates JPEG data.

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Tokyo, Japan

Norishiqe Morimoto