Digital watermark embedding method, digital watermark extracting method, recording medium, image recording device, and image replaying device
First Claim
1. A digital watermark embedding method comprising:
- acquiring embedding data to be embedded as a digital watermark;
forming packing data in which said embedding data is repeatedly connected at least three times to be sequential without interval;
forming real embedding information in which a redundancy bit with a fixed length that is used for error correction of an information bit is added immediately after said information bit in which said packing data is subdivided into data each having a fixed length; and
embedding real embedding information into image data.
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Abstract
Embedding data to be embedded as a digital watermark is acquired. Packing data is formed in which the embedding data is repeatedly connected three times or more sequentially without interval. Real embedding information is formed such that a redundancy bit with a fixed length that is used for an error correction of an information bit is added immediately after the information bit in which the packing data is subdivided into data each having a fixed length. The real embedding information is embedded into the image data itself. The embedding mechanism for the information is not easily understood, and security level is high.
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Citations
18 Claims
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1. A digital watermark embedding method comprising:
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acquiring embedding data to be embedded as a digital watermark;
forming packing data in which said embedding data is repeatedly connected at least three times to be sequential without interval;
forming real embedding information in which a redundancy bit with a fixed length that is used for error correction of an information bit is added immediately after said information bit in which said packing data is subdivided into data each having a fixed length; and
embedding real embedding information into image data. - View Dependent Claims (2, 3, 4)
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5. A recording medium for recording an image comprising:
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means for acquiring embedding data to be embedded as a digital watermark;
means for embedding said digital watermark as real embedding information;
means for adding packing data in which said embedding data is repeatedly connected at least three times sequentially without interval;
means for adding a redundancy bit with a fixed length that is used for error correction of an information bit immediately after said information bit; and
means for subdividing said packing data into data each having a fixed length. - View Dependent Claims (6, 7)
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8. An image recording device comprising:
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embedding data input means for acquiring embedding data to be embedded as a digital watermark;
packing data forming means for forming packing data in which said embedding data is repeatedly connected at least three times sequentially without interval;
redundancy bit addition means for forming real embedding information in which a redundancy bit with a fixed length that is used for error correction of an information bit is added immediately after said information bit in which said packing data is subdivided into data each having a fixed length;
embedding means for embedding said real embedding information into image data concerned; and
output means for writing information onto a recording medium on the basis of said image data concerned in which said real embedding information is embedded. - View Dependent Claims (9, 10, 11, 12)
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13. An image replaying device comprising image signal output means for outputting an image signal on the basis of information read from a recording medium that records an image concerned in which a digital watermark is embedded as real embedding information, comprising:
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means for acquiring said real embedding information containing embedding data to be embedded as a digital watermark is acquired;
means for repeatedly connecting packing data in which said embedding data is repeatedly connected at least three times sequentially without interval; and
means for adding a redundancy bit with a fixed length that is used for an error correction of an information bit immediately after said information bit in which said packing data is subdivided into data each having a fixed length. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification