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:
Jun. 25, 1996
Filed:
Mar. 24, 1995
Osamu Shimazaki, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
To obtain a binary gradation image from a continuous gradation image, a multi-valued image signal I(x,y) is compared with a threshold signal TH by a comparator to produce a binary image signal P(x,y), an error signal E(x,y) is determined from the binary image signal P(x,y) and the multi-valued image signal I(x,y), and the error signal E(x,y) is multiplied by an error diffusion coefficient W(k,l) to produce a diffusion error signals .DELTA.E(x,y). A random number R(x,y) generated by a random number generator and a weighting coefficient f(I(x,y)) generated as a function of an image signal by a weighting coefficient generator are multiplied, and the product is added to the diffusion error signals .DELTA.E(x,y). The sum is added to the multi-valued image signal I(x,y) thereby to produce a corrected multi-valued image signal I(x,y), which is then compared with the threshold signal TH by the comparator thereby generating a binary image signal P(x,y).