Computer based digital image noise reduction method based on ove

Details Computer based digital image noise reduction method based on ove Computer based digital image noise reduction method based on ove

1991-10-23

1996-07-02

Boudreau, Leo

Image analysis

Image enhancement or restoration

Image filter

382275, G06K 940

Patent

active

055331491

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 a 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.

REFERENCES:
patent: 4510618 (1985-04-01), Ataman et al.
patent: 4520505 (1985-05-01), Yamamoto et al.
patent: 4731865 (1988-03-01), Sivenpiper
patent: 4734770 (1988-03-01), Matsuba
patent: 4794531 (1988-12-01), Morishita et al.
patent: 4817180 (1989-03-01), Cho et al.
patent: 4827533 (1989-05-01), Tanaka
patent: 4903316 (1990-02-01), Hongo et al.
patent: 4941192 (1990-07-01), Mishima et al.
patent: 5091972 (1992-02-01), Kwon et al.
Panda et al., "Recursive Least Squares Smoothing of Noise in Images," IEEE Trans. on Acoustics, Speech and Signal Proc., vol. ASSP-25, No. 6, Dec. 77, pp. 520-524.

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