Method for sharpening a digital image without amplifying noise

Details Method for sharpening a digital image without amplifying noise Method for sharpening a digital image without amplifying noise

2005-05-10

2005-05-10

Patel, Kanjibhai (Department: 2625)

Image analysis

Image enhancement or restoration

Image filter

C382S264000, C382S254000

Reexamination Certificate

active

06891977

ABSTRACT:
A method of sharpening a digital image having image pixels according to its material content, includes the steps of: generating a subject matter belief map corresponding spatially to the image pixels, having belief values indicating the likelihood that respective image pixels are representative of a particular subject matter, generating a noisy pixel belief map corresponding spatially to the image pixels having belief values indicating the likelihood that the modulation about respective pixels are due to system noise; generating gain map from the subject matter belief map and the noisy pixel belief map having values that indicate the degree of sharpening to be applied to the image pixels; and using the gain map to sharpen the image.

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Textbook: Jain, Fundamentals of Digital Image Processing, 1989, Prentice-Hall, pp. 249-251.
U.S. Appl. No. 10/016,601, filed Dec. 10, 2001 by Luo et al.

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