发明名称 |
Method and apparatus for embedding a watermark into a digital image or image sequence |
摘要 |
A method and apparatus for watermarking an image or sequence of images without limiting the watermark signal. The watermarking apparatus includes a conventional DCT unit and quantizer for generating an array of quantized DCT coefficients. The array is watermarked by masking the array to select certain ones of the DCT coefficients that are then replaced by zero values to form a masked array. The masked array is further processed by a watermark inserter that replaces the zero valued coefficients with predefined watermark coefficients to form a watermarked array of DCT coefficients, e.g., a watermarked image. A decoder for decoding the bitstream thusly generated and for removing the embedded watermark is also taught.
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申请公布号 |
US6037984(A) |
申请公布日期 |
2000.03.14 |
申请号 |
US19970997965 |
申请日期 |
1997.12.24 |
申请人 |
SARNOFF CORPORATION |
发明人 |
ISNARDI, MICHAEL ANTHONY;MUSGRAVE, CLYDE |
分类号 |
H04N1/387;G06T1/00;H04N5/913;H04N7/26;H04N7/30;H04N7/50;(IPC1-7):H04N7/08 |
主分类号 |
H04N1/387 |
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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