8 May 2001 New nonlinear combined spatial-frequency domain filtering for noise reduction and image enhancement
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Abstract
A new approach to nonlinear filtering is considered in the paper. The key point of this approach is a combination of spatial and frequency domain filtering. The following filtering technique is proposed for noise reduction. On the first stage a noisy image has to be processed using some powerful nonlinear spatial-domain filter. Since the image will be smoothed after this operation, then its spectra has to be corrected. Taking into account that a major part of a noise is concentrated in the spectra amplitude, also as image smoothing involves a significant spectra amplitude distortion, a method for its correction is proposed. The same technique is also used for solving of the frequency correction (extraction of image details) problem.
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Igor N. Aizenberg, Naum N. Aizenberg, Taras Bregin, "New nonlinear combined spatial-frequency domain filtering for noise reduction and image enhancement", Proc. SPIE 4304, Nonlinear Image Processing and Pattern Analysis XII, (8 May 2001); doi: 10.1117/12.424977; https://doi.org/10.1117/12.424977
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KEYWORDS
Nonlinear filtering

Image filtering

Image enhancement

3D image enhancement

Digital filtering

Optical filters

Spatial filters

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