초록 ▼

The present invention is a method and apparatus for performing filtering operations on a digital image. One embodiment is enhancement of the contour fidelity of the image represented by a plurality of pixels, by storing pixel values representing a segment of the image in memory; isolating a pluralit

The present invention is a method and apparatus for performing filtering operations on a digital image. One embodiment is enhancement of the contour fidelity of the image represented by a plurality of pixels, by storing pixel values representing a segment of the image in memory; isolating a plurality of regions of the pixels of said image segment to form a plurality of windows including a central pixel and a plurality of pixels surrounding said central pixel. Then comparing at least two of the regions of pixels within the windows with a set of standard pixel patterns for each of the windows and identifying matching pixel patterns within each of the windows. When matching patterns are identified, enhancing one or more pixels located at a correctable position when the central pixel is located at a correctable position in a plurality of the windows wherein the enhancement is accomplished in accordance with an enhancement associated with one of the windows and wherein the enhancement is determined in accordance with a predetermined hierarchy for the windows.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of enhancing an image represented by a plurality of pixels, comprising the steps of:obtaining pixel values representing a segment of the image;isolating a plurality of regions of the pixels of said image segment to form a plurality of windows, a first window ha

[ What is claimed is:] [1.]1. A method of enhancing an image represented by a plurality of pixels, comprising the steps of:obtaining pixel values representing a segment of the image;isolating a plurality of regions of the pixels of said image segment to form a plurality of windows, a first window having dimension N.times.N, a second window having dimension A.times.B where A>=N and B>=N, and wherein B does not equal A, and a third window of dimension B.times.A orthogonal to said second window wherein overlapping regions of said windows are centered about a central pixel and a plurality of pixels surrounding said central pixel;comparing, in an heirarchical manner, at least two of the regions of pixels within said windows with a set of standard pixel patterns for each of the windows;identifying matching pixel patterns within each of the windows; andenhancing the central pixel when the central pixel is located at a correctable position in only one of the windows, and enhancing the central pixel when the central pixel is located at a correctable position in a plurality of the windows wherein the enhancement is accomplished in accordance with an enhancement associated with one of the windows.