lpenhance_main.m

来自「包内提供了Contourlet和Wavelet变换进行图像增强、去噪的各种算法和」· M 代码 · 共 37 行

function lpenhance_main
clc
clear all

in=imread('212.bmp');
im=rgb2gray(in);
figure,imshow(in);title('原始图像');axis on;
im = double(im) / 256;
rho=3;
sig = std(im(:));
sigma = sig / rho;
nim = im + sigma * randn(size(im));
figure,imshow(nim);title('噪声图像');axis on;
n=5;
pflit='9-7';
k=3;
lpy=lpd(nim,pflit,n);
for i=4:6
lpy{i}=k*f(lpy{i});
end
imrec=lpr(lpy,pflit);
figure,imshow(imrec);title('增强后的图像');axis on;

function coef=f(x)
[m,n]=size(x);
c=3;
for i=m
    for j=n
        if abs(x(i,j)<=c)
           x(i,j)=x(i,j);
        elseif x(i,j)>c
            x(i,j)=c;
        else x(i,j)=-c;
        end
    end
end
coef=x;