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Watermarked image generator and method of embedding watermarks into an input image

  • US 7,006,256 B2
  • Filed: 01/16/2002
  • Issued: 02/28/2006
  • Est. Priority Date: 01/16/2002
  • Status: Expired due to Fees
First Claim
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1. A watermarked image generator that embeds watermarks into an input image to generate a watermarked output image, comprising:

  • a watermark data source that inputs watermark data to a watermark embedding device, the watermark embedding device halftoning the input image to generate the output image made of 2×

    2 binary patterns, the 2×

    2 binary patterns forming the watermarks embedded in the output image,wherein the watermark embedding device includes;

    a tri-level error diffusion generator that performs tri-level error diffusion on a reduced resolution version of the input image by halftoning the input image into black, white and 50% gray; and

    a plurality of halftoning circuits that successively replace each pixel of the halftoned input image with one of a plurality of the 2×

    2 binary patterns, the one of the plurality of 2×

    2 binary patterns being selected based on at least one bit of the watermark data when a pixel of the halftoned image data is 50% gray.

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