Patents by Inventor Asghar Nafarieh

Asghar Nafarieh 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).

  • Adaptive quantization compatible with the JPEG baseline sequential mode
    Patent number: 6175650
    Abstract: Pixel blocks of an input image are type classified based on an analysis of the secord differences between the values of neighboring pixels in the rows and columns of each pixel block.
    Type: Grant
    Filed: January 26, 1998
    Date of Patent: January 16, 2001
    Assignee: Xerox Corporation
    Inventors: Pradeep S. Sindhu, Jean-Marc Frailong, Donald J. Curry, Asghar Nafarieh, Doron Kletter
  • Rotation of images for optical character recognition
    Patent number: 5235651
    Abstract: A method and apparatus for properly orienting an text in order to perform optical character recognition (OCR). The text is digitized and placed into an image. The image is subsampled to determine an initial "guess" about the orientation of the image. If there are are specified number of sets of lines between lines having no black-to-white or white-to-black transitions, then the image is assumed to be oriented correctly. Otherwise, the image is assumed to be perpendicular to the line-of-sight of the OCR engine and the image is rotated 90 degrees counterclockwise in a preferred embodiment. A combination of rotations and trial OCR scans for the image is performed until the best results for the trial OCR is obtained or the maximum number of iterations is exceeded. Then, the remainder of OCR is performed on the image.
    Type: Grant
    Filed: August 6, 1991
    Date of Patent: August 10, 1993
    Assignee: Caere Corporation
    Inventor: Asghar Nafarieh