Image processing apparatus and method therefor

Details Image processing apparatus and method therefor Image processing apparatus and method therefor

2006-05-16

2006-05-16

Ahmed, Samir (Department: 2623)

Image analysis

Applications

C382S232000, C382S251000, C713S176000, C348S460000, C375S243000

Reexamination Certificate

active

07046817

ABSTRACT:
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 portion32converts a image data value so that quantized values not changing by error introduced through the embedding process. A hash value calculator300calculates a hash value using image data and key information, and a hash value embedding portion302embeds the hash value in the image data. An output format converter304quantizes the image data in which the hash value is embedded, and generates JPEG data.

REFERENCES:
patent: 5568570 (1996-10-01), Rabbani
patent: 5765176 (1998-06-01), Bloomberg
patent: 5930369 (1999-07-01), Cox et al.
patent: 6037984 (2000-03-01), Isnardi et al.

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