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:
Aug. 09, 1994
Filed:
Jun. 25, 1992
Yukio Sakano, Fucyu, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image processing apparatus in which a multilevel image signal generated from an original image by a scanner is input and processed so as to produce multilevel image data describing a gray level of each pixel of an output image, includes a detection part for repeatedly detecting a peak of a multilevel image signal generated by a scanner and a valley thereof with respect to pixels of the original image aligned in a scanning direction of the scanner, and for outputting the peak of the multilevel image signal and the valley thereof, and a correction part for correcting a gray level of the multilevel image data with respect to each of the pixels depending on a difference between the peak and the valley, so as to reduce changes in gray level of pixels of the output image.