MATLAB: Original image size 769*770, I am geting error as dimension mismatch

Question

Original image size 769*770

org_im=imread('picture1.jpg');

[rows,columns,numberofcolorbands]=size(org_im)

if numberofcolorbands >1 org_im=org_im(:,:,2); end

org_im=im2double(org_im);

figure(1); imshow(org_im);title('Original Image')

f=zeros(771,772); [m,n]=size(f); f(769,770)=size(org_im);

I am getting an error as,

Subscripted assignment dimension mismatch.

Error in sobelmaskspat_d (line 23) f(769,770)=size(org_im);

How to overcome this,

please help me.

Thank you

Answer 1

f(769,770) = size(org_im);

The right hand side replies a vector, but the left hand side is one element of a matrix, a scalar. We cannot guess what this line should do. So please explain this detail.

If you want to pad a matrix by zeros:

f = zeros(771,772);
f(2:770, 2:771) = org_im;