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nested if-else inside nested if-else

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Kazmir Fahrier
Kazmir Fahrier on 13 May 2021
Commented: Kazmir Fahrier on 15 May 2021
In the following program it showed error in line 22.If elseif statement can't be used in this way,please suggest alternative way.
%code
function output = blur(img,w)
img(:) = double(img(:))+1;
[row col] = size(img);
output = zeros(row, col);
for i=1:row
for j=1:col
if (i-w)<1
if (j-w)<1
A = img([1:i+w,1:j+w]);
k = mean( img ,'all');
output(i,j) = k;
elseif (j+w)>col
A = img([1:i+w,j-w:col]);
k = mean( img ,'all');
output(i,j) = k;
else
A = img([1:i+w,j-w:j+w]);
k = mean( img ,'all');
output(i,j) = k;
end
elseif (i+w)>row
if (j-w)<1
A = img([i-w:row,1:j+w]);
k = mean( img ,'all');
output(i,j) = k;
elseif (j+w)>col
A = img([i-w:row,j-w:col]);
k = mean( img ,'all');
output(i,j) = k;
else
A = img([i-w:row,j-w:j+w]);
k = mean( img ,'all');
output(i,j) = k;
end
else
if (j-w)<1
A = img([i-w:i+w,1:j+w]);
k = mean( img ,'all');
output(i,j) = k;
elseif (j+w)>col
A = img([i-w:i+w,j-w:col]);
k = mean( img ,'all');
output(i,j) = k;
else
output(i,j) = mean(img(i-w:i+w,j-w:j+w));
end
end
end
end
output(:) = uint8(round(output(:)-1));
Error: File: blur.m Line: 22 Column: 5
Illegal use of reserved keyword "elseif".

Accepted Answer

DGM
DGM on 13 May 2021
Edited: DGM on 13 May 2021
I don't have the same problem when I run it. There was some other issue though.
img = rgb2gray(imread('sources/table.jpg'));
w = 10;
img(:) = double(img(:))+1;
[row col] = size(img);
output = zeros(row, col);
for i=1:row
for j=1:col
if (i-w)<1
if (j-w)<1
% why are you calculating A, but never using it?
A = img([1:i+w,1:j+w]);
k = mean( img ,'all');
output(i,j) = k;
elseif (j+w)>col
A = img([1:i+w,j-w:col]);
k = mean( img ,'all');
output(i,j) = k;
else
A = img([1:i+w,j-w:j+w]);
k = mean( img ,'all');
output(i,j) = k;
end
elseif (i+w)>row
if (j-w)<1
A = img([i-w:row,1:j+w]);
k = mean( img ,'all');
output(i,j) = k;
elseif (j+w)>col
A = img([i-w:row,j-w:col]);
k = mean( img ,'all');
output(i,j) = k;
else
A = img([i-w:row,j-w:j+w]);
k = mean( img ,'all');
output(i,j) = k;
end
else
if (j-w)<1
A = img([i-w:i+w,1:j+w]);
k = mean( img ,'all');
output(i,j) = k;
elseif (j+w)>col
A = img([i-w:i+w,j-w:col]);
k = mean( img ,'all');
output(i,j) = k;
else
% mean() of a 2D array is a vector
k = img(i-w:i+w,j-w:j+w);
output(i,j) = mean(k(:));
end
end
end
end
% using (:) in this assignment screws up class inheritance
% you end up with a 'double' image with incorrectly-scaled data
output = uint8(round(output-1));
I don't know why you would be getting that error
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More Answers (1)

VBBV
VBBV on 13 May 2021
Edited: VBBV on 13 May 2021
%if true
function output = blur(img,w)
img(:) = double(img(:))+1;
[row col] = size(img);
output = zeros(row, col);
for i=1:row
for j=1:col
if (i-w)<1
if (j-w)<1
A = img([1:i+w,1:j+w]);
k = mean( img ,'all');
output(i,j) = k;
elseif (j+w)>col
A = img([1:i+w,j-w:col]);
k = mean( img ,'all');
output(i,j) = k;
else
A = img([1:i+w,j-w:j+w]);
k = mean( img ,'all');
output(i,j) = k;
end
elseif (i+w)>row
if (j-w)<1
A = img([i-w:row,1:j+w]);
k = mean( img ,'all');
output(i,j) = k;
elseif (j+w)>col
A = img([i-w:row,j-w:col]);
k = mean( img ,'all');
output(i,j) = k;
else
A = img([i-w:row,j-w:j+w]);
k = mean( img ,'all');
output(i,j) = k;
end
elseif (j-w)<1
A = img([i-w:i+w,1:j+w]);
k = mean( img ,'all');
output(i,j) = k;
elseif (j+w)>col
A = img([i-w:i+w,j-w:col]);
k = mean( img ,'all');
output(i,j) = k;
else
output(i,j) = mean(img(i-w:i+w,j-w:j+w));
end
end
end
end

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