Patents by Inventor Wai M. Tsang

Wai M. Tsang 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: 5619591
    Abstract: A method for encoding and decoding still video frames, and a sequence of frames of digitized motion picture video data, using inter-frame analysis. Sequences of frames are encoded by first subdividing each frame within a set of adjacent frames into a plurality of blocks, each corresponding to at least one other block within at least one adjacent frame, so as to create a group of corresponding of blocks. A luminance component of each pixel within each group of corresponding blocks is averaged to generate a mean luminance value for each group of corresponding blocks. An upper color value for each group of corresponding blocks is determined, as well as a lower color value. A one-bit value is assigned to each pixel within each block. The one-bit value is set to a first binary level when the luminance component of an associated pixel value is greater in magnitude than the corresponding mean luminance value.
    Type: Grant
    Filed: August 23, 1995
    Date of Patent: April 8, 1997
    Assignee: Vtech Electronics, Ltd.
    Inventors: Wai M. Tsang, Ching K. Chan
  • Patent number: 5353246
    Abstract: A programmable semiconductor antifuse structure and method of fabricating are provided which allow for miniaturization of components to an area of less than one micron. The cell exhibits a high pre-programmed resistance of more than 1.times.10.sup.7 ohms and has an extremely low programmed cell resistance of around 50 ohms.
    Type: Grant
    Filed: August 18, 1993
    Date of Patent: October 4, 1994
    Assignee: Lattice Semiconductor Corporation
    Inventors: Wai M. Tsang, Daniel C. Hu, Dong T. Khong
  • Patent number: 5272666
    Abstract: A programmable semiconductor antifuse structure and method of fabricating are provided which allow for miniaturization of components to an area of less than one micron. The cell exhibits a high pre-programmed resistance of more than 1.times.10.sup.7 ohms and has an extremely low programmed cell resistance of around 50 ohms.
    Type: Grant
    Filed: October 18, 1991
    Date of Patent: December 21, 1993
    Assignee: Lattice Semiconductor Corporation
    Inventors: Wai M. Tsang, Daniel C. Hu, Dong T. Khong