Patents by Inventor Shohei Yamamoto

Shohei Yamamoto 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).

  • Offset drift correction method in color film inspection apparatus
    Patent number: 4802107
    Abstract: An offset drift correction method for use in in a color film inspection apparatus includes the steps of; measuring the changes of various amounts of light at intervals of a predetermined amount of light as density signals by using a green standardized logarithmic-transforming curve; providing table data by shifting the green standardized logarithmic-transforming curve as to inputs in such a way that the changes become equal to one another; writing the table data in a green look-up table; measuring input signals for red and blue at intervals of the predetermined amount of light; and substituting the measured inputs with the table data of the shifted green standardized logarithmic-transforming curve at corresponding amounts of light.
    Type: Grant
    Filed: September 1, 1987
    Date of Patent: January 31, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Shohei Yamamoto, Yukito Kato