Performance Evaluation of Noise Reduction Filters for Color Images through Normalized Color Difference (NCD) Decomposition

Figure 3

Results of (2𝑁+1)×(2𝑁+1) filtering: (a) 𝑁=2, (b) 𝑁=3, (c) 𝑁=4, and (d) 𝑁=5.

(a)

(b)

(c)

(d)