vector median filter
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is there any function in matlab for vector median filter or vector directional filter? plz help.
2 个评论
Walter Roberson
2011-12-28
Is there a difference between "vector median filter" and "median filter applied to a vector" ?
Yogesh Joshi
2011-12-28
采纳的回答
Chandra Kurniawan
2011-12-28
for 1D median filtering, Matlab has command medfilt1
Eq:
medfilt1([4 3 5 2 8 9 1],3)
ans =
3 4 3 5 8 8 1
4 个评论
Yogesh Joshi
2011-12-28
Chandra Kurniawan
2011-12-28
Image is 2D matrix.
But, don't be worry!
Matlab also provide medfilt2 for 2D median filtering.
Walter Roberson
2011-12-28
color images are 3D matrices.
Chandra Kurniawan
2011-12-29
Yes, I meant 3D matrix
That right function medfilt2 works on 2D image array.
Then, you can use the same function to filter rgb <color> image plane by plane.
I mean you need to apply this to red plane, green plane, blue plane one-by-one.
Here I give you sample code :
I = imread('peppers.png');
J = imnoise(I,'salt & pepper');
imshow(J);
K(:,:,1) = medfilt2(J(:,:,1));
K(:,:,2) = medfilt2(J(:,:,2));
K(:,:,3) = medfilt2(J(:,:,3));
figure, imshow(K);
更多回答（2 个）
Image Analyst
2011-12-28
0 个投票
Whether applying medfilt2() to each color plane independently (such as my code here: http://www.mathworks.com/matlabcentral/answers/16350-how-to-remove-pixels-in-an-image) is an improvement is something you'll have to decide as this can give color artifacts that can make it worse. Maybe you want to convert to HSV and just use medfilt2 on the V channel. Or you can do more sophisticated, smarter things like median filtering the image (somehow) and then replace only SOME of the pixels - the "bad" ones, which you've identified somehow - rather than all of them.
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2011-12-28
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