代碼如下：

clear all;

load wbarb; %小波變換邊緣提取程序

I = ind2gray(X,map);%檢索圖轉成灰度圖

imshow(I);

I1 = imadjust(I,stretchlim(I),[0,1]);%調整圖像的像素值，可以改變對比度和顏色

figure;

imshow(I1);

[N,M] = size(I);

h = [0.125,0.375,0.375,0.125];

g = [0.5,-0.5];

delta = [1,0,0];

J = 3;

a(1:N,1:M,1,1:J+1) = 0;

dx(1:N,1:M,1,1:J+1) = 0;

dy(1:N,1:M,1,1:J+1) = 0;

d(1:N,1:M,1,1:J+1) = 0;

a(:,:,1,1) = conv2(h,h,I,'same'); %二維卷積

dx(:,:,1,1) = conv2(delta,g,I,'same');

dy(:,:,1,1) = conv2(g,delta,I,'same');

x = dx(:,:,1,1);

y = dy(:,:,1,1);

d(:,:,1,1) = sqrt(x.^2+y.^2);

I1 = imadjust(d(:,:,1,1),stretchlim(d(:,:,1,1)),[0 1]);figure;imshow(I1);

lh = length(h);

lg = length(g);

for j = 1:J+1

lhj = 2^j*(lh-1)+1;

lgj = 2^j*(lg-1)+1;

hj(1:lhj)=0;

gj(1:lgj)=0;

for n = 1:lh

hj(2^j*(n-1)+1)=h(n);

end

for n = 1:lg

gj(2^j*(n-1)+1)=g(n);

end

a(:,:,1,j+1) = conv2(hj,hj,a(:,:,1,j),'same');

dx(:,:,1,j+1) = conv2(delta,gj,a(:,:,1,j),'same');

dy(:,:,1,j+1) = conv2(gj,delta,a(:,:,1,j),'same');

x = dx(:,:,1,j+1);

y = dy(:,:,1,j+1);

dj(:,:,1,j+1) = sqrt(x.^2+y.^2);

I1 = imadjust(dj(:,:,1,j+1),stretchlim(dj(:,:,1,j+1)),[0 1]);figure;imshow(I1);

end

總結

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