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. 11, 1998
Filed:
Jul. 23, 1997
James Matthews Kasson, Menlo Park, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A computationally efficient system spatially filters a digital input image to sharpen the image. A process is disclosed to spatially filter pixels of an RGB image by applying a high pass filter to the image. First, signals representative of luminance are extracted from the input image. Then, the extracted luminance signals are filtered. Quotient signals are then developed, representing the ratio between each filtered luminance signal and the corresponding original luminance signal. Quotient signals are multiplied by the corresponding pixels of each plane of the original image to provide an output image. The invention may also be embodied by an image editor to implement the spatial filtering process of the invention, where the image editor includes stored programming instructions executed by a processor, discrete circuit components, an ASIC, or another suitable hardware device.