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Image Denoising Using Dual Tree Statistical Models For Complex Wavelet Transform Coefficient Magnitudes

Image Denoising Using Dual Tree Statistical Models For Complex Wavelet Transform Coefficient Magnitudes

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Image Denoising Using Dual Tree Statistical Models For Complex Wavelet Transform Coefficient Magnitudes

Wavelet shrinkage is a standard technique for denoising natural im-ages. Originally proposed for univariate shrinkage in the Discrete Wavelet Transform (DWT) domain, it has since been optimised through the exploitation of translationally invariant wavelet de-compositions such as the Dual-Tree Complex Wavelet Transform (DT-CWT) alongside bivariate analysis techniques that condition the shrinkage on spatially related coefficients across neighbouring scales. These more recent techniques have denoised the real and imaginary components of the DT-CWT coefficients separately. Processing real and imaginary components separately has been found to lead to an increase in the phase noise of the transform which in turn affects denoising performance. On this basis, the work presented in this paper offers improved denoising performance through modelling the bivariate distribution of the coefficient mag-nitudes. The results were compared to the current state of the art non-local means denoising technique BM3D, showing clear subjec-tive improvements, through the retention of high frequency struc-tural and textural information. The paper also compares objective measures, using both PSNR and the more perceptually valid structural similarity measure (SSIM). Whereas PSNR results were slightly below those for BM3D, those for SSIM showed closer correlation with subjective assessment, indicating improvements over BM3D for most noise levels on the images tested.


 


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  • Model: PROJ7752
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This product was added to our catalog on Thursday 10 August, 2017.

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