Image analysis – Image enhancement or restoration – Artifact removal or suppression
Patent
1995-08-21
1997-01-14
Johns, Andrew
Image analysis
Image enhancement or restoration
Artifact removal or suppression
358463, G06K 940
Patent
active
055948162
ABSTRACT:
The method of the present invention reduces noise in digital photographic images by decomposing the digital image into smooth regions and edge regions and by electronically blurring the smooth regions. Smooth regions are areas lacking any sharp detail, such as blue sky. Edge regions are regions containing sharp detail, such as grass. The method operates by choosing a set of neighborhood pixel types from a matrix of pixels representing an image. For each target pixel in the image, all neighborhoods that include the target pixel are considered and a linear least squares regression is computed to fit a plane to the code values of the pixels in each neighborhood, resulting in a goodness of fit and least squares estimate for the code value at the target pixel. Finally, a noise reduced code value for the target pixel is computed as a normalized, weighted sum of the least squares estimates for the target pixel, summed over all the neighborhoods containing the target pixel. The weights are determined as a function of the goodness of fit and the neighborhood type.
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Kaplan Martin C.
Kwon Hee-min
Eastman Kodak Company
Johns Andrew
Watkins Peyton C.
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