Patents by Inventor Stephen M. Blonstein

Stephen M. Blonstein 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).

  • Apparatus and method for compressing still images
    Patent number: 5664028
    Abstract: Transforms such as the DCT are useful for image compression. One close relative of the DCT is preferred for its arithmetic simplicity. A method and apparatus is described whereby the image compression is done with no multiplications while still compatible with a JPEG (Joint Photographic Experts Group) Transform. Other enhancements are made to improve image quality.
    Type: Grant
    Filed: October 31, 1995
    Date of Patent: September 2, 1997
    Assignees: Ricoh Corporation, Ricoh Company, Ltd.
    Inventors: Stephen M. Blonstein, James D. Allen, Martin P. Boliek
  • Apparatus and method for compressing still images
    Patent number: 5319724
    Abstract: Transforms such as the DCT are useful for image compression. One close relative of the DCT is preferred for its arithmetic simplicity. A method and apparatus is described whereby the image compression is done with no multiplications while still compatible with a JPEG (Joint Photographic Experts Group) Transform. Other enhancements are made to improve image quality.
    Type: Grant
    Filed: August 9, 1991
    Date of Patent: June 7, 1994
    Assignees: Ricoh Corporation, Ricoh Company, Ltd.
    Inventors: Stephen M. Blonstein, James D. Allen, Martin P. Boliek