Patents by Inventor Lou H. Berkley

Lou H. Berkley 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).

  • Low visibility watermark using time decay fluorescence
    Patent number: 6996252
    Abstract: A physical object is embedded with a first digital watermark component and a second digital watermark component. The first component is printed using a first ultraviolet (UV) ink. The first UV ink includes a first fluorescence decay time. The second component is printed using a second UV ink. The second ink includes a second fluorescence decay time, which is longer than the first decay time. The embedded media is illuminated with a UV pulse. The first component is detected after the first emission decay time, but before the second emission decay time.
    Type: Grant
    Filed: April 5, 2004
    Date of Patent: February 7, 2006
    Assignee: Digimarc Corporation
    Inventors: Alastair M. Reed, Lou H. Berkley, Jr.
  • Low visibility watermark using time decay fluorescence
    Patent number: 6718046
    Abstract: Media is embedded with an out-of-phase digital watermark. A first component of the digital watermark is printed using a first ultraviolet (UV) ink. The first UV ink includes a first fluorescence decay time. The second digital watermark component is inverted with respect to the first component and is printed using a second UV ink. The second ink includes a second fluorescence decay time, which is longer than the first decay time. The embedded media is illuminated with a UV pulse. The watermark is detected after the first emission decay time, but before the second emission decay time. The watermark is fragile under steady-state UV illumination since the inverted watermark component cancels the non-inverted component.
    Type: Grant
    Filed: August 31, 2001
    Date of Patent: April 6, 2004
    Assignee: Digimarc Corporation
    Inventors: Alastair M. Reed, Lou H. Berkley, Jr.
  • Low visibility watermark using time decay fluorescence
    Publication number: 20020090112
    Abstract: Media is embedded with an out-of-phase digital watermark. A first component of the digital watermark is printed using a first ultraviolet (UV) ink. The first UV ink includes a first fluorescence decay time. The second digital watermark component is inverted with respect to the first component and is printed using a second UV ink. The second ink includes a second fluorescence decay time, which is longer than the first decay time. The embedded media is illuminated with a UV pulse. The watermark is detected after the first emission decay time, but before the second emission decay time. The watermark is fragile under steady-state UV illumination since the inverted watermark component cancels the non-inverted component.
    Type: Application
    Filed: August 31, 2001
    Publication date: July 11, 2002
    Inventors: Alastair M. Reed, Lou H. Berkley