I am trying enlarge an image using interpolation without using MATLAB commands, but my image isn't resizing properly.

This function interpolates the rows first and then the columns from the interpolated rows.

function [enl] = enlarge(image)

img = imread(image);
img = double(img);
[m,n] = size(img);
% enl = zeros(m,n);

for i = 1:1:m
    for j = 1:2:n-1

          enl(i,j+1) = (img(i,j)+img(i,j+1))/2;

      end
  end

for i = 1:2:m-1
    for j = 1:1:n

          enl(i+1,j) = (img(i,j)+img(i+1,j))/2;

      end
  end

imshow(enl)

imwrite(enl, 'enl.gif')

end

[Walter Roberson]

Please describe the difference between what you see and what you want.

[Brady]

Thank you, I see what you mean. How can I make sure they include each other?

Answer 1

[Walter Roberson]

You are interpolating in one direction, but then you are ignoring the results of that when you interpolate in the other direction. Both times you overwrite the matrix en1 with values computed solely from img.

[Brady]

Thank you, I see what you mean. How can I make sure they include each other?

Answer 2

[Image Analyst]

Why not just imresize?

Answer 3

[Dingbang Liang]

i tried this one, but it doesnt work. error is saying unusage of the first column "image", how to solve it?

[Image Analyst]

It doesn't say that. "unusage" is not even a word. Paste the actual error message, including the line of code and the line numbers and the actual error message, as well as your script. In other words, attach your script, and any image or data that needs to be read in by it, and paste back here the complete error message ( ALL the red text).