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:
Feb. 08, 2000
Filed:
Mar. 17, 1998
Toshiyuki Sano, Yokohama, JP;
Keiji Toyoda, Hamamatsu, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An input image is divided into relatively small blocks of pixels. Border data defining the areas are periodically calculated. For each pixel, a pair of selection pulses indicative of the area where the pixel is located is generated. In response to the pair of pulses, the gray scale characteristic is calculated for each area. The gray scale of the input image is corrected using one of the gray scale characteristic associated with each area to providing a corrected image signal for the area. In response to the pair of pulses, the corrected image signals are combined into an output image signal. An optimal gray scale correction is made for each area. The selection pulses are configured to gradually change near the borders thereby making the reproduced image appear natural.