Patents by Inventor Chung-Hui Kuo

Chung-Hui Kuo 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).

  • Multilevel halftone screen and sets thereof
    Publication number: 20070236741
    Abstract: A three-dimensional halftone screen is provided that is suited for multilevel printing. The three-dimensional halftone screen includes a plurality of planes each corresponding to one or more input intensity levels of an input RIPped pixel. Within the planes are screen dots, each associated with one or more output exposure intensity values representing an intensity of an exposure dot corresponding to the input RIPped pixel.
    Type: Application
    Filed: March 31, 2006
    Publication date: October 11, 2007
    Inventors: Hwai-Tzuu Tai, Chung-Hui Kuo, Dmitri Gusev
  • Color enhancement method and system
    Publication number: 20070097461
    Abstract: An apparatus and method for calibrating a multi-color imaging system are provided. Color values are measured for each of the different color patches, and compared to target process-sensitive colors color values, representing a weight-adjusted memory color. An error value is calculated. The error value represents a deviation of the measured color values from the target color values. The input values for each colorant then are independently adjusted to reduce the error value to a predetermined degree.
    Type: Application
    Filed: October 28, 2005
    Publication date: May 3, 2007
    Inventors: Yee Ng, Hwai-Tzuu Tai, Chung-Hui Kuo, Dmitri Gusev
  • Enhancing CMYK color workflow for CMYKF color
    Publication number: 20060170938
    Abstract: A method of printing with a CMYKF or specialized CMYK printer comprising the steps of characterizing the CMYK gamut of the printer, characterizing the CMYKF or specialized CMYK gamut of the printer, morphing the L*a*b* data associated with the CMYK gamut into L*a*b*(*) data associated with the CMYKF gamut with pre-selected control points, constructing a L*a*b* to L*a*b*(*) transform function in accordance with the morphing step, and utilizing the L*a*b* to L*a*b*(*) transform function for printing with the printer.
    Type: Application
    Filed: February 1, 2005
    Publication date: August 3, 2006
    Inventors: Victor Ibarluzea, Chung-Hui Kuo, Hwai-Tzuu Tai
  • Color contour detection and correction
    Publication number: 20060072128
    Abstract: A method of printing comprising the steps of detecting a contour in a first color space image, locating the contour, mapping the image into the second image space, and changing the mapping curve shape, changing the printer profile (e.g. changing the printer mapping function), editing the image, or other method to reduce or eliminate perceived contouring.
    Type: Application
    Filed: September 27, 2004
    Publication date: April 6, 2006
    Inventors: Yee Ng, Chung-Hui Kuo, Dmitri Gusev
  • Color clustering and segmentation using sigma filtering
    Publication number: 20020114512
    Abstract: A color clustering and segmentation method retains edge. A sigma filter is applied to an input image to generate a smoothed image. The filtered image is divided into a plurality of non-overlapping windows. A sequential clustering algorithm is applied to filtered pixels of each window to generate potential clusters. Generated potential clusters are validated while clusters representing pixels on boundaries are rejected. The result is a generated list of cluster centroids in a chosen color space.
    Type: Application
    Filed: February 20, 2001
    Publication date: August 22, 2002
    Inventors: Ravishankar Rao, Chung-Hui Kuo, Gerhard R. Thompson