Undefined function 'padarray' for input arguments of type 'uint8'.

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Myra Poblete
Myra Poblete 2020-6-10
评论： Walter Roberson 2020-6-12
I am doing the MATLAB for beginners in Coursera. I am supposed to blur the image provided. The code works when run in my PC but I am getting this error message on the assignment page.
Undefined function 'padarray' for input arguments of type 'uint8'.
Error in blur (line 3)
img_padded = padarray(img,[w w],0,'both');
function output = blur(img,w)
img = uint8(img);
img_padded = padarray(img,[w w],0,'both');
[row, col] = size(img_padded);
blurred = zeros (row, col);
for ii = (1+w):(row-w)
for jj = (1+w):(col-w)
submatrix = zeros(2*w + 1, 2*w + 1);
for kk = (ii-w):(ii+w)
for ll = (jj-w):(jj+w)
submatrix (kk,ll) = img_padded (kk,ll);
end
end
blurred (ii,jj) = sum (submatrix, 'all')/((2*w+1)^2);
end
end
output = blurred (w+1:row-w,w+1:col-w);
output = uint8(output);
end
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Myra Poblete
Myra Poblete 2020-6-10
Thank you for the prompt response Walter. I have padded the matrix on my own, which worked but failed in both tests.
function output = blur(img,w)
img = uint8(img);
[a b] = size(img);
img_padded = zeros(a+2*w, b+2*w);
img_padded(1+w:a+w, 1+w:b+w) = img;
[row, col] = size(img_padded);
blurred = zeros (row, col);
for ii = (1+w):(row-w)
for jj = (1+w):(col-w)
submatrix = zeros(2*w + 1, 2*w + 1);
for kk = (ii-w):(ii+w)
for ll = (jj-w):(jj+w)
submatrix (kk,ll) = img_padded (kk,ll);
end
end
blurred (ii,jj) = sum (submatrix, 'all')/((2*w+1)^2);
end
end
output = blurred (w+1:row-w,w+1:col-w);
output = uint8(output);
end
Walter Roberson
Walter Roberson 2020-6-12
>> blur(ones(10,10),3)
ans =
10×10 uint8 matrix
0 0 0 1 1 1 1 0 0 0
0 1 1 1 1 1 1 1 1 0
0 1 1 1 1 1 1 1 1 0
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 0
0 1 1 1 1 1 1 1 1 0
0 0 0 1 1 1 1 0 0 0
It seems unlikely that an image that is all 1 should get blurred into something that contains some 0's.
However, you did not post the problem statement of what is to happen at the boundaries.

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