Calculating noise estimates of a digital image using...

Details Calculating noise estimates of a digital image using... Calculating noise estimates of a digital image using...

2006-08-15

2006-08-15

Ahmed, Samir (Department: 2624)

Image analysis

Image enhancement or restoration

C382S274000, C382S275000, C358S003260, C358S520000

Reexamination Certificate

active

07092579

ABSTRACT:
A method of estimating the noise in a digital image for use in subsequent image processing, includes receiving a source digital image having a plurality of pixels; selecting a pixel of interest; providing a plurality of orientations for the pixel of interest; using gradient analysis on the source digital image and the plurality of orientations to select the most suitable orientation for estimating noise for the pixel of interest; using the selected orientation in the pixel of interest to determine a noise-free pixel estimate for the pixel of interest; and repeating for other pixels of interest and using the noise-free pixel estimates to calculate a noise characteristic value representing the noise estimate for the source digital image.

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“Digital Image Smoothing and the Sigma Filter” by Jong-Sen Lee, Computer Vision, Graphics, and Image Processing vol. 24, pp. 255-269, 1983.

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