Noise reduction in an image

Details Noise reduction in an image Noise reduction in an image

1996-12-20

1998-10-20

Porta, David P.

X-ray or gamma ray systems or devices

Electronic circuit

With display or signaling

378 62, H05G 164

Patent

active

058258469

ABSTRACT:
In a method of processing an image the image is divided in one or more blocks. Separate blocks are spatially frequency transformed in that pixel-values of the blocks are transformed into spectral coefficients. A noise level of the image is estimated and reduced spectral coefficients are derived from spectral coefficients and the estimated noise level. Pixel-values for a processed block are synthesized from the reduced spectral coefficients and the processed blocks are assembled into a processed image. The noise level is estimated from the image information within the image. Preferably, a few parameters relating to the circumstances under which the image was acquired are also taken into account for estimating the noise level.

REFERENCES:
patent: 5327242 (1994-07-01), Naimpally et al.
patent: 5461655 (1995-10-01), Vuylsteke et al.
patent: 5671264 (1997-09-01), Florent et al.

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