FIGURE 1 Hierarchical structure of current image denoising approaches (Motwani et al. Citation2004).
FIGURE 2 Linear filters’ effects.
FIGURE 3 Effects of nonlinear filters: (a) original image (b) filtered image.
FIGURE 4 Effects of spatial-frequency filtering: (a) original image (b) filtered image.
FIGURE 5 Effects of wavelet domain filters: (a) original image (b) filtered image.
FIGURE 6 Effects of data-adaptive transforms: (a) original image (b) filtered image.
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