Patents by Inventor Chizu Watanabe

Chizu Watanabe 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).

  • Gamut clipping with preprocessing
    Patent number: 8643922
    Abstract: A method is provided for gamut clipping with preprocessing enabled as software instructions stored in a computer-readable medium and executable by a processor. The instructions provide a color in a color space defined by at least three attributes. If the color lies outside a gamut boundary in the first color space, a distance is measured from the color to the gamut boundary. In response to the measured distance, a weight is calculated for an attribute of the color. Then, it is determined if the attribute of the color is to be shifted. If so, an attribute shift amount is derived. The attribute shift amount of the color is modified by applying the weighting. The attribute of the first color is shifted by the weighted attribute shift amount, creating a post-processed color. The post-processed color is then clipped.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: February 4, 2014
    Assignee: Sharp Laboratories of America, Inc.
    Inventors: John Dairymple, James Zhixin Chang, Chizu Watanabe
  • Methods, systems and apparatus for jointly calibrating multiple displays in a display ensemble
    Patent number: 8531474
    Abstract: Aspects of the present invention are related to systems, methods and apparatus for calibration of multiple display apparatus in a display ensemble.
    Type: Grant
    Filed: November 11, 2011
    Date of Patent: September 10, 2013
    Assignee: Sharp Laboratories of America, Inc.
    Inventors: James Zhixin Chang, John C. Dalrymple, Chizu Watanabe
  • Methods, Systems and Apparatus for Jointly Calibrating Multiple Displays in a Display Ensemble
    Publication number: 20130120589
    Abstract: Aspects of the present invention are related to systems, methods and apparatus for calibration of multiple display apparatus in a display ensemble.
    Type: Application
    Filed: November 11, 2011
    Publication date: May 16, 2013
    Inventors: James Zhixin Chang, John C. Dalrymple, Chizu Watanabe
  • Methods and systems for sampling and modeling of colorant-limited, multi-colorant color spaces
    Patent number: 8358441
    Abstract: Aspects of the present invention relate to methods and systems for determining output responses and device targets for multi-colorant output devices. Some aspects relate to methods and systems for multi-dimensional rectilinear sampling, transformation of samples from an unlimited colorant space to a colorant-limited space, obtaining additional samples within a colorant-limitation hyperplane and interpolation of values in a colorant-limited space.
    Type: Grant
    Filed: April 1, 2009
    Date of Patent: January 22, 2013
    Assignee: Sharp Laboratories of America, Inc.
    Inventors: James Zhixin Chang, Chizu Watanabe
  • Gamut Clipping with Preprocessing
    Publication number: 20110051207
    Abstract: A method is provided for gamut clipping with preprocessing enabled as software instructions stored in a computer-readable medium and executable by a processor. The instructions provide a color in a color space defined by at least three attributes. If the color lies outside a gamut boundary in the first color space, a distance is measured from the color to the gamut boundary. In response to the measured distance, a weight is calculated for an attribute of the color. Then, it is determined if the attribute of the color is to be shifted. If so, an attribute shift amount is derived. The attribute shift amount of the color is modified by applying the weighting. The attribute of the first color is shifted by the weighted attribute shift amount, creating a post-processed color. The post-processed color is then clipped.
    Type: Application
    Filed: August 28, 2009
    Publication date: March 3, 2011
    Inventors: John C. Dalrymple, James Zhixin Chang, Chizu Watanabe
  • Methods and Systems for Sampling and Modeling of Colorant-Limited, Multi-Colorant Color Spaces
    Publication number: 20100253698
    Abstract: Aspects of the present invention relate to methods and systems for determining output responses and device targets for multi-colorant output devices. Some aspects relate to methods and systems for multi-dimensional rectilinear sampling, transformation of samples from an unlimited colorant space to a colorant-limited space, obtaining additional samples within a colorant-limitation hyperplane and interpolation of values in a colorant-limited space.
    Type: Application
    Filed: April 1, 2009
    Publication date: October 7, 2010
    Inventors: James Zhixin Chang, Chizu Watanabe