clear all;
I = imread('4.png');
subplot(121);imshow(I);
title('原始彩色图像');
if length(size(I)) == 3
I = rgb2gray(I);
end
[X,Y] = size(I);
V_max = max(max(I));
V_min = min(min(I));
T0 = (V_max + V_min)/2;
h = imhist(I);
grayp = imhist(I)/numel(I);
I = double(I);
H0 = -sum(grayp(find(grayp(1:end)>0)).*log(grayp(find(grayp(1:end)>0))));
cout = 100;
while(cout>0)
Tmax = 0;
grayPd = 0; grayPb = 0;
Hd = 0; Hb = 0;
T1 = T0;
A1 = 0; A2 = 0;
B1 = 0; B2 = 0;
for i = 1:X
for j = 1:Y
if(I(i,j)<=T1)
A1 = A1+1;
B1 = B1+I(i,j);
else
A2 = A2+1;
B2 = B2+I(i,j);
end
end
end
M1 = B1/A1;
M2 = B2/A2;
T2 = (M1+M2)/2;
TT = round(T2);
grayPd = sum(grayp(1:TT));
if grayPd == 0
grayPd = eps;
end
grayPb = 1-grayPd;
if grayPb == 0;
grayPb = eps;
end
Hd = -sum((grayp(find(grayp(1:TT)>0))/grayPd).*log((grayp(find(grayp(1:TT)>0))/grayPd)));
Hb = -sum(grayp(TT+(find(grayp(TT+1:end)>0)))/grayPb.*log(grayp(TT+(find(grayp(TT+1:end)>0)))/grayPb));
H1 = Hd+Hb;
cout = cout-1;
if(abs(H0 - H1)<0.0001)|(cout == 0)
Tmax = T2;
break;
else
T0 = T2;
H0 = H1;
end
end
Tmax
cout
for i = 1:X
for j = 1:Y
if(I(i,j)<=Tmax)
I(i,j) = 0;
else
I(i,j) = 1;
end
end
end
subplot(122);imshow(I);
title('图像处理分割后的效果');
