How to mirror pad a matrix

How to do mirror padding to the matrix

I = [
1	6	3	3	4	5	1	2
2	5	7	2	2	2	6	2
4	4	6	8	3	5	3	8
5	3	3	4	5	2	2	7
6	5	2	2	7	6	2	4
7	1	4	2	3	5	3	3
2	4	2	4	7	3	3	2
1	2	4	5	6	2	3	1];

mirror_padding = [
1 1 2 4 5 6 2 3 1 1
2 1 6 3 3 4 5 1 2 1
2 2 5 7 2 2 2 6 2 2
8 4 4 6 8 3 5 3 8 4
7 5 3 3 4 5 2 2 7 5
4 6 5 2 2 7 6 2 4 6
3 7 1 4 2 3 5 3 3 7
2 2 4 2 4 7 3 3 2 2
1 1 2 4 5 6 2 3 1 1
1 1 6 3 3 4 5 1 2 1];

When using padarray or imfilter i get different outputs for mirror padded matrix. How to get values as shown in the below image

[Walter Roberson]

How are the diagonal corners chosen? You have set them all to 1, but the mirror of the 2 in the upper right corner should show up as the bottom left corner of the padded image.

Answer 1

[Walter Roberson]

I = [
1	6	3	3	4	5	1	2
2	5	7	2	2	2	6	2
4	4	6	8	3	5	3	8
5	3	3	4	5	2	2	7
6	5	2	2	7	6	2	4
7	1	4	2	3	5	3	3
2	4	2	4	7	3	3	2
1	2	4	5	6	2	3	1];

mirror_padded = [1, I(end,:), 1; I(:,end), I, I(:,1); 1, I(1,:), 1]

mirror_padded = 10×10

1 1 2 4 5 6 2 3 1 1 2 1 6 3 3 4 5 1 2 1 2 2 5 7 2 2 2 6 2 2 8 4 4 6 8 3 5 3 8 4 7 5 3 3 4 5 2 2 7 5 4 6 5 2 2 7 6 2 4 6 3 7 1 4 2 3 5 3 3 7 2 2 4 2 4 7 3 3 2 2 1 1 2 4 5 6 2 3 1 1 1 1 6 3 3 4 5 1 2 1

Answer 2

[KSSV]

Let A be your given matrix of size 8*8 and vec be your vector which has to be padded and of size 1*8;

iwant = ones(10) ; 
iwant(2:end-1,2:end-1) = A ;   % repalce A 
iwant(1,2:end-1) = vec ;  % top 
iwant(2:end-1,end) = vec' ;  % right 
iwant(end,2:end-1) = fliplr(vec) ;  % bottom 
iwant(2:end-1,1) = flipud(vec') ;  % left