Patents by Inventor Chyi Tsao

Chyi Tsao 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).

  • Shading correction system for use with an optical scanner
    Patent number: 5036186
    Abstract: An improved shading correction system is disclosed where the light intensity variations of the light sources are sensed and are fed back to the shading correction system for improved shading correction. Such feedback action may be applied both during the recording of shading profile reference values when a reference target is scanned and for shading correction when the actual target is scanned.
    Type: Grant
    Filed: April 26, 1990
    Date of Patent: July 30, 1991
    Assignee: ACER Incorporated
    Inventor: Chyi Tsao