Patents by Inventor Frederick Lin

Frederick Lin 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).

  • Method and apparatus for quantizing a color image through a single dither matrix
    Patent number: 6862111
    Abstract: This invention relates to a color image dithering method and apparatus for producing an output point in an output color space corresponding to a selected vertex in a tetrahedron of a three-dimensional cubic subinterval of a pixel point in a source color space.
    Type: Grant
    Filed: January 31, 2001
    Date of Patent: March 1, 2005
    Assignee: PictoLogic, Inc.
    Inventors: Frederick Lin, Shultz Chan
  • Method and apparatus for printer head error compensation
    Publication number: 20040218960
    Abstract: An LED printing system includes a data source, a printer controller and an LED printer head. The data source is used to provide original data. The printer controller is used to process the original data. The LED printer head is used to print the processed data without further processing them.
    Type: Application
    Filed: April 19, 2004
    Publication date: November 4, 2004
    Applicant: Pictologic, Inc.
    Inventor: Frederick Lin
  • Method and apparatus for quantizing a color image through a single dither matrix
    Publication number: 20020008885
    Abstract: This invention relates to a color image dithering method and apparatus for producing an output point in an output color space corresponding to a selected vertex in a tetrahedron of a three-dimensional cubic subinterval of a pixel point in a source color space.
    Type: Application
    Filed: January 31, 2001
    Publication date: January 24, 2002
    Inventors: Frederick Lin, Shultz Chan
  • Dithered image compression system
    Patent number: 6201614
    Abstract: A dithered image compression system that converts a source image into an image that is efficiently compressed and yet preserves the visual image information of the original source image in a computer environment. A preferred embodiment of the invention removes the image data from the source image that are lost during the normal storage and halftoning stages in one step. Each pixel in the source image is compared to the threshold array values. If the value of the source image pixel is less than the corresponding threshold array pixel, then a zero is placed in that position in the dithered image array, otherwise a one is placed in the dithered image array. The dithered image array is then compared with the threshold array, thereby creating a range array where the range of each pixel is determined using the dithered image array values combined with the threshold array values.
    Type: Grant
    Filed: December 24, 1998
    Date of Patent: March 13, 2001
    Assignee: Electronics for Imaging, Inc.
    Inventor: Frederick Lin