周期噪声 g(x,y)=f(x,y)h(x,y)+n(x,y) G(u,)=F(u,)H(u,)+N(u,v) ab FIGURE 5.5 (a)Image corrupted by additive sinusoidal noise. (b)Spectrum showing two conjugate impulses caused by the sine wave. (Original image courtesy of NASA.) 与空间位置有关 频率域滤波周期噪声 频率域滤波 与空间位置有关 g(𝑥, 𝑦) = 𝑓(𝑥, 𝑦)ℎ(𝑥, 𝑦) + 𝜂(𝑥, 𝑦) 𝐺(𝑢, 𝑣) = 𝐹(𝑢, 𝑣)𝐻 𝑢, 𝑣 + 𝑁(𝑢, 𝑣)