Method and device for single and/or multi-scale noise reduction

Details Method and device for single and/or multi-scale noise reduction Method and device for single and/or multi-scale noise reduction

1994-05-04

1995-09-19

Boudreau, Leo H.

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

382280, G06K 936

Patent

active

054523761

ABSTRACT:
For noise reduction in a two-dimensional image it is sampled according to a regular array of window sampling positions. The image function is then subjected to multiplication by a window function and conversion to a weighted sum of polynomials according to ascending order. If the next-m-lowest order coefficient signals a sufficient intensity variation in the window, all coefficients are used for subsequent inverse polynomial transform. Otherwise, predominantly only the lowest order coefficient is used therefore. In a cascaded organization, the lowest order coefficient is viewed as itself representing the image information and likewise processed in a forward-inverse polynomial transform organization with respect to an upscaled-size window. The result is then used in a next lower cascade level in lieu of the unprocessed lowest order coefficient itself.

REFERENCES:
patent: 4118104 (1988-01-01), Anderson
patent: 4442454 (1984-04-01), Powell
patent: 4941042 (1990-07-01), Martens
patent: 4953018 (1990-08-01), Martens

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