噪声概率密度函数一空间独立的噪声 脉冲（椒盐）噪声 p2) 1 0.6 V2ro P for 2%-1 Gaussian p)=P, 0.607 for=0 1-(R+P) for=V -+ (b-1)/@ the range of possible intensity p(z) p() P(2) values for that image is [0,2k1] 1-(P+P) b-a (e.g.,[0,255]for an 8-bit image). Exponential Uniform Salt-and. pepper 若P。或Pb为零，则脉冲称为单级脉冲 abe de f FIGURE 5.2 Some important probability density functions.20 噪声概率密度函数—空间独立的噪声 脉冲（椒盐）噪声 若Pa或Pb为零，则脉冲称为单级脉冲 the range of possible intensity values for that image is [0, 2 k - 1] (e.g.,[0,255] for an 8-bit image)