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Multiple watermarking techniques for documents and other data

  • US 6,332,031 B1
  • Filed: 07/14/2000
  • Issued: 12/18/2001
  • Est. Priority Date: 01/20/1998
  • Status: Expired due to Term
First Claim
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1. A method of creating a watermarked image which comprises the steps of:

  • modifying an HSI (hue, saturation, Intensity) representation of an image to imbed a first watermark in said image and create a first watermarked image, transforming said first watermarked image to the RGB (red, green, blue) color space, biasing the values which represent a second watermark toward a particular color, modifying said HSI values to imbed said biased second watermark in said image and create a second watermarked image, transforming said second watermarked image to the RGB color space, and combining the values of said first and second watermarked images to create a final watermarked image.

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