Patents by Inventor Jiang Duan

Jiang Duan 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).

  • Histogram adjustment for high dynamic range image mapping
    Patent number: 7639893
    Abstract: A method of automatic mapping of image data includes representing image data for an image as luminance values, determining a key value as a function of an average luminance value of the image and of minimum and maximum luminance values of the image, generating offset-adjusted luminance values including applying an offset to each of the luminance values, the offset being a function of the determined key value, and computing a tone reproduction curve for at least a region of the image which includes applying a mapping function to the offset-adjusted luminance values.
    Type: Grant
    Filed: May 17, 2006
    Date of Patent: December 29, 2009
    Assignee: Xerox Corporation
    Inventors: Jiang Duan, Marco Bressan, Christopher R. Dance, Guoping Qiu
  • Histogram adjustment for high dynamic range image mapping
    Patent number: 7636496
    Abstract: A method of automatic mapping of image data includes representing image data for an image as luminance values, determining a key value as a function of an average luminance value of the image and of minimum and maximum luminance values of the image, generating offset-adjusted luminance values including applying an offset to each of the luminance values, the offset being a function of the determined key value, and computing a tone reproduction curve for at least a region of the image which includes applying a mapping function to the offset-adjusted luminance values.
    Type: Grant
    Filed: May 17, 2006
    Date of Patent: December 22, 2009
    Assignee: Xerox Corporation
    Inventors: Jiang Duan, Marco Bressan, Christopher R. Dance
  • Histogram adjustment for high dynamic range image mapping
    Publication number: 20070269132
    Abstract: A method of automatic mapping of image data includes representing image data for an image as luminance values, determining a key value as a function of an average luminance value of the image and of minimum and maximum luminance values of the image, generating offset-adjusted luminance values including applying an offset to each of the luminance values, the offset being a function of the determined key value, and computing a tone reproduction curve for at least a region of the image which includes applying a mapping function to the offset-adjusted luminance values.
    Type: Application
    Filed: May 17, 2006
    Publication date: November 22, 2007
    Inventors: Jiang Duan, Marco Bressan, Christopher R. Dance, Guoping Qiu
  • Histogram adjustment for high dynamic range image mapping
    Publication number: 20070268534
    Abstract: A method of automatic mapping of image data includes representing image data for an image as luminance values, determining a key value as a function of an average luminance value of the image and of minimum and maximum luminance values of the image, generating offset-adjusted luminance values including applying an offset to each of the luminance values, the offset being a function of the determined key value, and computing a tone reproduction curve for at least a region of the image which includes applying a mapping function to the offset-adjusted luminance values.
    Type: Application
    Filed: May 17, 2006
    Publication date: November 22, 2007
    Inventors: Jiang Duan, Marco Bressan, Christopher R. Dance