发明名称 |
Durable and undecipherable digital watermarking technique and detection of unauthorized use |
摘要 |
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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申请公布号 |
US2004146160(A1) |
申请公布日期 |
2004.07.29 |
申请号 |
US20030716429 |
申请日期 |
2003.11.20 |
申请人 |
NOMIZU YASUYUKI;SAKUYAMA HIROYUKI;HARA JUNICHI;MATSUURA NEKKA;YANO TAKANORI;KODAMA TAKU;MIYAZAWA TOSHIO;SHINKAI YASUYUKI;NISHIMURA TAKAYUKI |
发明人 |
NOMIZU YASUYUKI;SAKUYAMA HIROYUKI;HARA JUNICHI;MATSUURA NEKKA;YANO TAKANORI;KODAMA TAKU;MIYAZAWA TOSHIO;SHINKAI YASUYUKI;NISHIMURA TAKAYUKI |
分类号 |
G06T1/00;H04N1/32;H04N1/387;H04N1/41;H04N7/08;H04N7/081;H04N7/167;H04N7/30;(IPC1-7):H04N7/167 |
主分类号 |
G06T1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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