Patents by Inventor Xiao B. Zhang

Xiao B. Zhang 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).

  • Patent number: 5317646
    Abstract: A forms recognition system having a method which assists an operator in creating an electronic template. The automated method would allow an operator to view an electronic bitmap of a master or blank form on a graphical display, the master form having bounded or semi-bounded regions depicting fields. An operator would display the bitmap, select a single point within a bounded or semi-bounded region on the bitmap with a pointing device, and the coordinates representing the bounded region would be automatically determined using the single point selected by the operator.
    Type: Grant
    Filed: March 24, 1992
    Date of Patent: May 31, 1994
    Assignee: Xerox Corporation
    Inventors: Henry W. Sang, Jr., Whei-Tsu H. Tahn, Xiao B. Zhang
  • Patent number: 5245165
    Abstract: A self-clocking glyph code is provided for encoding dual bit digital values in the cardinal rotations (0.degree., 90.degree., 180.degree. and 270.degree.) of a logically ordered sequence of wedge-shaped glyphs that are written, printed, or otherwise recorded on a hardcopy recording medium in accordance with a predetermined spatial formatting rule. For example, these wedge-shaped glyphs suitably are essentially identical right triangles. The widths of such glyphs vary unidirectionally as a function of their height, so they can be decoded reliably, even when they are degraded by scan errors, dropped scan lines and/or random noise patterns.
    Type: Grant
    Filed: December 27, 1991
    Date of Patent: September 14, 1993
    Assignee: Xerox Corporation
    Inventor: Xiao B. Zhang