Structure-Oriented Multidirectional Wiener Filter for Denoising of Image and Video Signals
| Autor: | Aishy Amer, Mohammed Ghazal, Ali Ghrayeb |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Anisotropic diffusion
business.industry Wiener filter ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION Wiener deconvolution Filter (signal processing) Raised-cosine filter symbols.namesake Filter design Gaussian noise Computer Science::Computer Vision and Pattern Recognition Media Technology symbols Computer vision Artificial intelligence Electrical and Electronic Engineering business Root-raised-cosine filter Mathematics |
| Zdroj: | IEEE Transactions on Circuits and Systems for Video Technology. 18:1797-1802 |
| ISSN: | 1558-2205 1051-8215 |
| DOI: | 10.1109/tcsvt.2008.2004925 |
| Popis: | In this letter, we propose a structure-oriented multidirectional Wiener filter to reduce additive white Gaussian noise in image and video signals. A local activity profile based on second derivatives is used to restrict filtering to homogeneous directions to combat blurring. The proposed filter improves the Wiener estimate of denoised pixels to reduce the residual blurring of the conventional Wiener filter while achieving higher noise-reduction gains of up to 5.6 dB peak signal-to-noise-ratio (PSNR). The parameters of the proposed filter (block size, shape and coefficients) are adapted to image structure and noise level for optimization with respect to noise-reduction gain and structure preservation. The effectiveness of the proposed method is shown using both the PSNR and the modulation transfer function calculated for a range of spatial frequencies to measure the degradation in contrast due to blurring. Our results show that the proposed method achieves a higher contrast transfer ratio than the conventional Wiener filter indicating improved preservation of high frequency content. We also show the performance of the proposed filter relative to reference anisotropic diffusion and wavelet methods. |
| Databáze: | OpenAIRE |
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