What is wrong with my image filter code?
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Hello i have a code below,it works with n=3 ,but for kernel n=5 or above it doesnt work
error: ??? Attempted to access window(18); index out of bounds because numel(window)=17.
how can i fix it? Thanks.
% code
clear all
image=imread('cameraman.tif');
n=3
nPercent = 10;
[y x]=size(image);
nMaxHeight=round(y*nPercent/100.0);
nMaxWidth=round(x*nPercent/100.0);
for I=1:nMaxHeight,
for J=1:nMaxWidth,
cx=round(rand(1)*(x-1))+1;
cy=round(rand(1)*(y-1))+1;
aaa=round(rand(1)*255);
if aaa>128
image(cy,cx)=255;
else
image(cy,cx)=1;
end
end
end
for i=1:x
for j=1:y
if(i==1 || j==1 || i==x ||j==y)
image_out(j,i)=image(j,i);
else
for l= 1:n
for k=1:n
window(l+(k-1)*3)=image(j+l-2,i+k-2);
end
end
for l=1:(n*n-1)
for k=2:(n*n)
if (window(l)>window(k))
temp=window(k);
window(k)=window(l);
window(l)=temp;
end
end
end
image_out(j,i)=window(5);
end
end
end
figure
subplot(1,2,1);imshow(image)
subplot(1,2,2);imshow(image_out)
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採用された回答
Jan
2015 年 3 月 26 日
編集済み: Jan
2015 年 3 月 26 日
If you remove the evil clear all you could use the debugger to step through your code line by line to find out, what's going on.
You create window with n+(n-1)*3 elements, but try to access the values until n*n.
By the way: What about using sort for an efficient sorting?
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その他の回答 (2 件)
Image Analyst
2015 年 3 月 26 日
Don't use "image" as a variable name since it's a built in function.
For the first double for loop, where you threshold the image, simply do:
binaryImage = yourImage > 128;
For the second loop, I'm not exactly sure what you're doing, but you can probably do your second loop without loops using a single call to imfilter(), or conv2(), or medfilt2(), or ordfilt2() .
8 件のコメント
Image Analyst
2015 年 3 月 27 日
I have no idea what their definition of that is. Of course, all filters are arithmetic in that they use numbers.
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