How to add filter just foreground and another filter to background?

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ZeZe Joscy
ZeZe Joscy 2021-12-7
回答： yanqi liu 2021-12-8
Hello, i am trying to add filter to foreground and another filter to background:
I had an gray scale image which background is blur and foreground has an object. And i separated my image with iterative optimal threshold algorithm. Here is my code:
I=imread('a.png');
A=stdfilt(I);
T=1;
%% G1 is foreground, G2 is background %%
for i=1:16
G1=T>A;
G2=T<=A;
m1=mean(A(G1));
m2=mean(A(G2));
Tnew=(m1+m2)/2;
T=Tnew;
end
Here i am trying to add L filter to just foreground but it doesn't work.
L=[-1 -1 -1;-1 8 -1;-1 -1 -1];
P=imfilter(G1,L);
R=I+P;
And here i am trying to add Gfilter to just background but it also doesn't work.
G=1/16*[1 2 1;2 4 2;1 2 1];
J=imfilter(I(G2),G);
Result=J+R;
I know i am wrong somewhere but i also don't know how to fix it.

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采纳的回答

yanqi liu
yanqi liu 2021-12-8
Ran in:
clc; clear all; close all;
I=imread('rice.png');
A=stdfilt(I);
T=1;
% G1 is foreground, G2 is background %%
for i=1:16
G1=T>A;
G2=T<=A;
m1=mean(A(G1));
m2=mean(A(G2));
Tnew=(m1+m2)/2;
T=Tnew;
end
figure; imshow(G1, []);
figure; imshow(G2, []);
G1 = I.*uint8(G1);
G2 = I.*uint8(G2);
figure; imshow(G1, []);
figure; imshow(G2, []);
% add L filter to just foreground
L=[-1 -1 -1;-1 8 -1;-1 -1 -1];
P=imfilter(G1,L);
R=I+P;
% add Gfilter to just background
G=1/16*[1 2 1;2 4 2;1 2 1];
J=imfilter(G2,G);
Result=J+R;
% imshow
figure; imshow(R, []);
figure; imshow(Result, []);

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