Patents by Inventor Donald S. Levinstone

Donald S. Levinstone 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: 4829381
    Abstract: A system and method are provided for continuously enhancing electronic image data received in a continuous stream of electronic information signals wherein the electronic information signal corresponding to each pixel of the image recorded is selectively transformed as a function of the average value of electronic information signals for a select plurality of pixel values in the immediate area of the pixel value being transformed. The electronic information signal transformations are provided on a pixel-by-pixel basis to increase contrast in localized areas that may be either exceptionally light or dark as a result of varying scene lighting conditions.
    Type: Grant
    Filed: April 18, 1988
    Date of Patent: May 9, 1989
    Assignee: Polaroid Corporation
    Inventors: Woo-Jin Song, Donald S. Levinstone
  • Patent number: 4752831
    Abstract: An automatic focusing system for a camera apparatus utilizes a two-dimensional photosensitive array to determine image sharpness as a function of the image information sensed in both the rows and columns of individual photosensitive pixel elements. A transfer function may be imposed upon the electronic information signal derived from the two-dimensional photoresponsive array or, alternatively, upon the incident scene light to the two-dimensional photoresponsive array to centerweight the focus condition determining signal where the principle subject will be most likely framed.
    Type: Grant
    Filed: May 15, 1987
    Date of Patent: June 21, 1988
    Assignee: Polaroid Corporation
    Inventors: Conrad H. Biber, William T. Vetterling, Donald S. Levinstone, Olin C. Brown, III
  • Patent number: 4647975
    Abstract: An electronic imaging camera is provided with a substantially expanded dynamic exposure range by implementing two succeeding exposure intervals under conditions where the exposure defining parameters are substantially different and thereafter selectively choosing between the electronic information signals sensed during the two succeeding exposure intervals to provide an output signal from which a visible image of the subject may be reconstructed thereafter.
    Type: Grant
    Filed: October 30, 1985
    Date of Patent: March 3, 1987
    Assignee: Polaroid Corporation
    Inventors: Lawrence E. Alston, Donald S. Levinstone, William T. Plummer