Corner sharpening using look-up table edge pixel identification

Details Corner sharpening using look-up table edge pixel identification Corner sharpening using look-up table edge pixel identification

2005-12-23

2009-12-29

Patel, Kanji (Department: 2624)

Image analysis

Image enhancement or restoration

Edge or contour enhancement

C382S199000

Reexamination Certificate

active

07639891

ABSTRACT:
The teachings provided herein disclose a method for corner sharpening in the display of a bitmapped digital image. The method includes the steps of selecting a target pixel location within the digital image; observing a set of pixels within a pixel observation window superimposed on the digital image relative to the target pixel location; generating edge-state codes for a plurality of pairs of neighboring vectors of pixels within the pixel observation window; generating corner-identification codes from the plurality of edge-state codes using at least one look-up table so as to thereby identify corner pixels; and, assigning a pixel value in an output image plane in a location corresponding to the target pixel in the input image, such that assigned value extends a corner where indicated by a corner identification code, thereby producing a sharpening effect. The method may be used for improving the print quality of line-art corners and other fine details as found in both font and image data.

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Robert P. Loce et al., U.S. Appl. No. 11/317,818, filed simultaneously herewith, entitled “Edge Pixel Identification”.
Robert P. Loce et al., U.S. Appl. No. 11/317,782, filed simultaneously herewith, entitled “Anti-Aliased Tagging Using Look-Up Table Edge Pixel Identification”.
Robert P. Loce et al., U.S. Appl. No. 11/318,131, filed simultaneously herewith, entitled “Tinted Edge Enhancement Using Look-Up Table Edge Pixel Identification”.
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