Image noise reduction system using a wiener variant filter in a

Details Image noise reduction system using a wiener variant filter in a Image noise reduction system using a wiener variant filter in a

1995-05-15

1998-03-17

Couso, Jose L.

Image analysis

Image compression or coding

G60K 936

Patent

active

057296316

ABSTRACT:
The invention relates to a novel process and system for removing noise from an image by first noise modeling an image signal source to generate noise masks and LUT values characteristic of noise at different frequency levels for each channel, and then applying the stored noise masks and LUT values to an image signal for noise removal. The image is first captured as an electronic image signal by the image signal source, then represented by a pyramid structure whereby each successive level of the pyramid is constructed from DC values of the previous level, and each level of the pyramid corresponds to a different frequency band of the image signal. A Wiener variant filter using DCT transforms is used to filter DCT coefficients at each level. The image is restored with reduced noise by replacing DC values with next level IDCT coefficients then performing an IDCT on the results.

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"Two-Dimensional Signal and Image Processing" by Jae S. Lim, 1990 Prentice-Hall Inc., pp. 527-567.

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