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Electronic watermark insertion device, detection device, and method

  • US 20020012446A1
  • Filed: 07/02/2001
  • Published: 01/31/2002
  • Est. Priority Date: 07/05/2000
  • Status: Active Grant
First Claim
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1. A device that embeds an electronic watermark into an original image, comprising:

  • a circuit that performs discrete cosine transform (DCT) for the original image to output DCT coefficients;

    a circuit that embeds the watermark into the DCT coefficients, the watermark containing in a part thereof an instruction to an electronic watermark detection device;

    a circuit that quantizes the DCT coefficients into which the watermark is embedded; and

    a circuit that variable-length encodes the quantized DCT coefficients.

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