Patents by Inventor Kien T. Nguyen

Kien T. Nguyen 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).

  • HVQ compression for image boundaries
    Patent number: 6529553
    Abstract: In a system where two types of data are to be compressed using hierarchical vector quantization (HVQ), it would be typical for there to be two compression tables, one optimized for each type of data. A boundary between the two types may occur within a block to be compressed. In this case, a third table, optimized for a block having both types of data, is used.
    Type: Grant
    Filed: April 15, 2002
    Date of Patent: March 4, 2003
    Assignee: Xerox Corporation
    Inventors: Uoc H. Nguyen, Kien T. Nguyen, Abraham E. Claproth, Weili Lin
  • HVQ compression combined with orthogonal rotation
    Patent number: 6470052
    Abstract: Using hierarchical vector quantization (HVQ) to accomplish rotation in addition to compression and decompression. During the compression step the image is divided into segments and each segment is reduced to a codeword. These codewords are transposed so that the segments will be in rotated order when printed. Then the codewords are decompressed to form segments in which the pixels are in rotated order.
    Type: Grant
    Filed: June 29, 1998
    Date of Patent: October 22, 2002
    Assignee: Xerox Corporation
    Inventors: Uoc H. Nguyen, Kien T. Nguyen, Abraham E. Claproth, Arnold Hackett
  • HVQ compression for image boundaries
    Publication number: 20020110196
    Abstract: In a system where two types of data are to be compressed using hierarchical vector quantization (HVQ), it would be typical for there to be two compression tables, one optimized for each type of data. A boundary between the two types may occur within a block to be compressed. In this case, a third table, optimized for a block having both types of data, is used.
    Type: Application
    Filed: April 15, 2002
    Publication date: August 15, 2002
    Applicant: Xerox Corporation
    Inventors: Uoc H. Nguyen, Kien T. Nguyen, Abraham E. Claproth, Weili Lin
  • Two channel HVQ (hierarchical vector quantization) compression
    Patent number: 6205252
    Abstract: A compression process of dividing each word to be compressed into least and most significant bits, and applying a different compression ratio to each. If the compression processes are lossy, both parts of the output can also be losslessly compressed before being output. Hierarchical vector quantization can be issued for either lossy compressor.
    Type: Grant
    Filed: June 29, 1998
    Date of Patent: March 20, 2001
    Assignee: Xerox Corporation
    Inventors: Uoc H. Nguyen, Kien T. Nguyen, Abraham E. Claproth, Sang-chul Kang, Chia-hao Lee
  • HVQ compression of data and printing hints
    Patent number: 6078696
    Abstract: Printing hints can be efficiently compressed in a system using hierarchical compression (HVQ) by first using HVQ to generate compressed codewords, and then adding the printing hint to the codewords to generate an intermediate form of codeword, before sending this intermediate form to a pattern matching lossless compressor for final compression. Even though the same printing hint may be applied to a number of codewords, the overall compression will be affected very little by the addition of the printing hints since the hints are identical over a large number of codewords in series.
    Type: Grant
    Filed: June 29, 1998
    Date of Patent: June 20, 2000
    Assignee: Xerox Corporation
    Inventors: Uoc H. Nguyen, Kien T. Nguyen, Abraham E. Claproth, Thanh D. Truong