hi, I'm trying to solve an enlarge image problem. I need to enlarge image 1.7*x and 1.3*y But I'm getting error as

 Attempted to access (0.7,0.3); index must be a positive
integer or logical.

 Error in Untitled (line 5)
        B((1.7*i-1),(1.3*j-1))=A(i,j);

Here is my code

 A=double(imread('image'));

for i=1:256
  for j=1:256       
      B((1.7*i-1),(1.3*j-1))=A(i,j);
      B((1.7*i),(1.3*j-1))=A(i,j);
      B((1.7*i-1),(1.3*j))=A(i,j);
      B((1.7*i),(1.3*j))=A(i,j);
  end
end

 imshow(uint8(B));

Answer 1

[Geoff Hayes]

Halil - the error messages makes sense since the code is trying to access elements within the array B using non-integer indices. Why not use imresize to resize/scale your image given the required dimensions? Or are you trying to code this yourself? If the latter, you will probably have to do some sort of interpolation. See https://en.wikipedia.org/wiki/Image_scaling for some examples.

[Halil Gedik]

Yes, trying to code myself to improve my coding skills, thanks for helping.

[Image Analyst]

Alright, sorry, I just thought you might want to know the easier, built-in way of doing it, that's why I gave the code below.

I see you accepted so you probably have it all working now, but if you still have problems, let us know. The only code you gave will have several problems - non-integer indices, and "holes" in the output image due to some pixels not being assigned. I guess you've realized that and fixed it.

Answer 2

[Image Analyst]

[rows, columns, numberOfColorChannel] = size(A);
newRows = 1.3 * rows;
newColumns = 1.7 * columns;
outputImage = imresize(A, [newRows, newColumns]);