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:
Sep. 18, 2001
Filed:
Aug. 13, 1999
Abstract
An adaptive piece-wise approximation method for gamma correction is disclosed. The method includes an adaptive way for segmenting the brightness intensity input range and after the segmentation, a set of selected sampling points is taken. A simplified gamma correction circuit is then designed to omit the subtraction and the division calculation in the gamma correcting function by choosing the segmentation points appropriately. The improved gamma correction circuit comprises a multiplexer, a subtractor, an offset block, a multiplier, a division block, and an adder. An intensity signal at the set of selected input points is sampled and the sampled values are stored in providing a top value and a bottom value for the video intensity value to be gamma corrected. The video intensity value is then sent into the gamma correction circuit to get a gamma corrected data word representing pixel intensity for its respective input video intensity value.
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