The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 12, 1998
Filed:
Nov. 21, 1996
Barbara L Farrell, Ontario, NY (US);
Xerox Corporation, Stamford, CT (US);
Abstract
A system and method for determining a black threshold grey value for an image. A histogram is generated corresponding to possible grey values of the image and a first grey value having a peak frequency associated with a black distribution is determined from the histogram. A second grey value having a peak frequency equal to one quarter of the peak frequency associated with the first grey value, a third grey value having a peak frequency equal to 5/8 of the peak frequency associated with the first grey value, a fourth grey value located on a negative slope-side of the first grey value having a peak frequency equal to one quarter of the peak frequency associated with the first grey value, and a fifth grey value having a minimum peak frequency associated with the histogram are also determined. A black threshold grey value for the image is calculated from the first, second, third, fourth, and fifth grey values.