Patents by Inventor Ujjaval Desai

Ujjaval Desai 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: 5790269
    Abstract: Edge or contour information is extracted from an image array by filtering and encoded. In order to improve reproduction accuracy, two separate filters are used to detect edge information. One of the filters detects "sharp" edges, or edges in which the discontinuity in pixel intensity values occurs over a range of a few pixels. The other filter detects "level" edges in which the pixel intensity value discontinuity occurs over a larger range of pixels than the "sharp" edges. The "smooth" areas between edges or contours are assumed to vary continuously between the contours, but for efficient implementation, a one-dimensional linear interpolation is used to regenerate the contour information between edges. In addition, to further improve performance, a line is fitted to the pixel intensity data. The end values of this line are then used for the pixel intensity data.
    Type: Grant
    Filed: December 12, 1995
    Date of Patent: August 4, 1998
    Assignee: Massachusetts Institute of Technology
    Inventors: Ichiro Masaki, Ujjaval Desai, Anantha Chandrakasan, Berthold Horn