Patents by Inventor Lester A. Gerhardt

Lester A. Gerhardt 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: 5481622
    Abstract: An eye-tracking system determines the position of a user's pupil and maps this position into a point of regard of the user on an interface device, such as a display screen, or other real-world object by a system comprising a camera for acquiring a video image of the pupil; a frame grabber coupled to the camera for accepting and converting analog video data from the camera to digital pixel data; a computer coupled to the frame grabber for processing the digital pixel data to substantially determine the position of the pupil; a display screen coupled to the computer; and a support connected to the camera and display screen for fixing the relative physical positions thereof relative to the user's pupil.
    Type: Grant
    Filed: March 1, 1994
    Date of Patent: January 2, 1996
    Assignee: Rensselaer Polytechnic Institute
    Inventors: Lester A. Gerhardt, Ross M. Sabolcik
  • Patent number: 3971068
    Abstract: A portable, low-cost, bichannel image processing and enhancement system t can be programmed to accept two video sources, operate upon one or both simultaneously and deliver an enhanced result to a color monitor. The operations that can be performed on each source include, for example, unity gain, logarithmic amplification and differentiation, and both outputs thereafter can be subjected to such arithmetic operations as addition, subtraction and multiplication. The results are passed through an electronic user programmed window, color encoded by a quantizer and then displayed on a color monitor. The processor includes an area measurement circuit which quantitatively measures the percentage of the screen covered by any of the levels used in the quantizer, a luminance distribution analyzer which generates an histogram approximation to the distribution of grey levels in the image and a luminance cross-section analyzer which displays a graph of the image luminance along a vertical line.
    Type: Grant
    Filed: August 22, 1975
    Date of Patent: July 20, 1976
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Lester A. Gerhardt, Nelson R. Corby, Jr., Edward M. Sims