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. 02, 2003
Filed:
Feb. 10, 2000
Vladimir Levantovsky, North Andover, MA (US);
Oak Technology, Inc., Sunnyvale, CA (US);
Abstract
A method of adaptive spatial filtering for enhancing digital images is presented. A window is applied to a source pixel to generate an array of windowed pixels. An upper threshold value and lower threshold value corresponding to the maximum and minimum pixel values, respectively, in the array of windowed pixels are determined. A spatial frequency filter is applied to the array of windowed pixels to generate a filtered array of pixels including a reference pixel. The values of the source pixel and the reference pixel are scaled by respective weighting factors and then combined to create an enhanced pixel value. If the enhanced pixel value exceeds the upper threshold value, the enhanced pixel value is replaced by the upper threshold value. Similarly, if the enhanced pixel value is less than the lower threshold value, the enhanced pixel value is replaced by the lower threshold value. The resulting array of enhanced values provides greater edge transitions yet does not result in overshoot and undershoot regions which are generated by many traditional edge enhancement methods. In addition, color shifts associated with independent processing of individual color planes are avoided.