An Efficient Universal Noise Removal Algorithm Combining Spatial Gradient and Impulse Statistic

Figure 7

(a) Part of the original Bridge image. (b) Image corrupted with mixed noise (salt-and-pepper and random-valued impulse noise; 𝑝=30%). (c) 3×3 median filter. (d) 5×5 median filter. (e) ROAD-TRIF. (f) ROLD-EPR. (g) RORD-WMF. (h) DWM filter. (i) SG-DARD-TRIF.

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