how to filter the noise in my image correctly?

Hello, everyone. I meet some problems about how to use filter correctly.

if true
I=imread('eight.tif');
subplot(1,4,1);
imshow(I,[]);
subplot(1,4,2);
Noise=imnoise(I,'salt & pepper',0.025);
imshow(Noise,[]);
xlabel('带噪声的图像');
subplot(1,4,3);
h=fspecial('average',3);
Area=imfilter(Noise,h,'replicate');
imshow(Area,[]);
end

Firstly, i add some noise and then I want to filter this noise, but the third image still exists some noise. So what can I do to avoid this and what's reasons for that ? Thanks a lot. Hang

Answer 1

[Image Analyst]

See my attached salt and pepper noise demos.

[Y]

Thanks a lot