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

Myra Poblete

2020 6 10

0 个回答

8 次查看（30 天）

0 个投票

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

3 个评论
显示 1更早的评论隐藏 1更早的评论

Myra Poblete 2020-6-10

在 MATLAB Online 中打开

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 2020-6-12

在 MATLAB Online 中打开

>> blur(ones(10,10),3)
ans =
  10×10 uint8 matrix
 0   0   1   1   1   1   0   0   0
 1   1   1   1   1   1   1   1   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   1   1   1   1   0
 1   1   1   1   1   1   1   1   0
 0   0   1   1   1   1   0   0   0