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:
Nov. 28, 2000
Filed:
Nov. 07, 1997
Koichi Watanabe, Saitama, JP;
Fuji Photo Film Co. Ltd., Kanagawa, JP;
Abstract
Luminance levels of an analog or digital image signal entered from outside are detected as a luminance histogram. Based on the luminance histogram, a black luminance level and a white luminance level are determined, and are assigned respectively to a darkest tonal level and a lightest tonal level of a gradation range available for printing. To those pixels having luminance levels between the black and white levels, tonal levels between the darkest and lightest tonal levels are assigned according to a gradation conversion curve. The gradation conversion curve is selected among from a plurality of predetermined conversion curves depending upon a scene discrimination coefficient. The scene discrimination coefficient is calculated by multiplying the frequency of each luminance level shown in the luminance histogram with a different luminance coefficient predetermined according to the luminance level, and accumulating multiplication results of all the luminance levels.