Attempted to access pad_org(1,343); index out of bounds because size(pad_org)=[544,342].

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vetri veeran
vetri veeran on 21 Nov 2014
Commented: vetri veeran on 21 Nov 2014
original_im=imread('Picture1.tif');
figure,imshow(original_im);
pad_org=padarray(original_im,[1 1],'both');
figure(3);imshow(pad_org)
for i=1:size(pad_org,1)-2
for j=1:size(pad_org,2)-2
window=zeros(25,1); %%Matrix to store the value of 5 by 5 window
win_inc=1;%%initial value of window matrix
for k=1:size(window,1)/5
for l=1:size(window,1)/5
window(win_inc)=pad_org(i+k-1,j+l-1);
win_inc=win_inc+1;
end
end
median=sort(window); %%arranging the window by ascending order
new_image(i,j)=median(13);%%13 is the median value of 5 by 5 window
end
end
new_image=uint8(new_image);
figure(4);imshow(new_image);title('Image After Median Filtering')
I am getting an error as
Attempted to access pad_org(1,343); index out of bounds because size(pad_org)=[544,342].
Error in medianfilter_withoutbuiltin (line 54) window(win_inc)=pad_org(i+k-1,j+l-1);
I am unable sort out this error.
Please help me.
Thanks

Accepted Answer

Geoff Hayes
Geoff Hayes on 21 Nov 2014
Vetri - your window vector is of size 25x1, and your innermost for loop iterates, with the index l, from one to 5 (25/5). This index is used in the initialization of window at
window(win_inc)=pad_org(i+k-1,j+l-1);
where it is added to j which is the index that starts at one and ends at the number of columns of pad_org less two (so 340). So if j is 340, then when l is four we get
j+l-1 = 340+4-1 = 343
which falls outside the bounds on the number of columns of pad_org. You will need to rethink the window size, or iterate as
for j=1:size(pad_org,2)-4
instead.

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