Patents by Inventor Yui Man Lui

Yui Man Lui has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Rotation, scale, and translation resilient public watermarking for images using a log-polar fourier transform
    Patent number: 6282300
    Abstract: A method for detecting a watermark signal in digital image data. The detecting method includes the steps of: computing a log-polar Fourier transform of the image data to obtain a log-polar Fourier spectrum; projecting the log-polar Fourier spectrum down to a lower dimensional space to obtain an extracted signal; comparing the extracted signal to a target watermark signal; and declaring the presence or absence of the target watermark signal in the image data based on the comparison. Also provided is a method for inserting a watermark signal in digital image data to obtain a watermarked image.
    Type: Grant
    Filed: January 21, 2000
    Date of Patent: August 28, 2001
    Assignee: Signafy, Inc.
    Inventors: Jeffrey A. Bloom, Ingemar J. Cox, Matthew L. Miller, Min Wu, Ching-Yung Lin, Yui Man Lui