Cryptography – Video cryptography
Reexamination Certificate
2003-11-20
2008-08-05
Moazzami, Nasser (Department: 2136)
Cryptography
Video cryptography
C380S220000, C382S100000, C713S176000, C283S113000, C358S003280
Reexamination Certificate
active
07409060
ABSTRACT:
A digital watermarking technique is disclosed, in which image data are converted to frequency components through discrete wavelet transform and quantized into a set of quantized coefficients, which are then divided into a plurality of blocks. A digital watermark is embedded in the quantized coefficients by performing ON/OFF adjustment of bit information, such that the relation between natural number T and the bit information defined by N (N is an even number) significant bits Qnm (x, y) of the m-th bit plane of the n-th block satisfies the ON state represented by equation (1), or the OFF state represented by equation (2), depending on whether the hash value of the n-th block is odd or even. Then the quantized coefficients are encoded to produce a code stream.
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Hara Junichi
Kodama Taku
Matsuura Nekka
Miyazawa Toshio
Nishimura Takayuki
Moazzami Nasser
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Ricoh & Company, Ltd.
Shiferaw Eleni
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