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Considering also @tuannhtn answer and playing a bit around I managed to achieve the in between cols/rows removal by the following code:

Mat a = (Mat_<int>(5, 5) << 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26);

cout << endl << a << endl;

[1, 2, 3, 4, 5; 7, 8, 9, 10, 11; 12, 13, 14, 15, 16; 17, 18, 19, 20, 21; 22, 23, 24, 25, 26]

Mat b, c;

a(Range(0, a.rows - 2), Range(0, a.cols)).copyTo(b); a(Range(a.rows - 1, a.rows), Range(0, a.cols)).copyTo(c);

vconcat(b, c, b); cout << endl << b <<endl;< p="">

[1, 2, 3, 4, 5; 7, 8, 9, 10, 11; 12, 13, 14, 15, 16; 22, 23, 24, 25, 26]

Mat d, e; a(Range(0, a.rows), Range(0, a.cols - 3)).copyTo(d); a(Range(0, a.rows), Range(a.cols - 2, a.cols)).copyTo(e);

hconcat(d, e, d); cout << endl << d <<endl;< p="">

[1, 2, 4, 5; 7, 8, 10, 11; 12, 13, 15, 16; 17, 18, 20, 21; 22, 23, 25, 26]

Considering also @tuannhtn answer and playing a bit around I managed to achieve the in between cols/rows removal by the following code:

Mat a = (Mat_<int>(5, 5) << 1, 2, 3, 4, 5,
                             7, 8, 9, 10, 11,
                             12, 13, 14, 15, 16,
                             17, 18, 19, 20, 21,
                             22, 23, 24, 25, 26);
 
26);

cout << endl << a << endl;
 
endl;

[1, 2, 3, 4, 5;
 7, 8, 9, 10, 11;
 12, 13, 14, 15, 16;
 17, 18, 19, 20, 21;
 22, 23, 24, 25, 26]
 
26]

Mat b, c;
 
c;

a(Range(0, a.rows - 2), Range(0, a.cols)).copyTo(b);
a(Range(a.rows - 1, a.rows), Range(0, a.cols)).copyTo(c);
 
a.cols)).copyTo(c);

vconcat(b, c, b);
cout << endl << b <<endl;< p="">

<<endl;

[1, 2, 3, 4, 5;
 7, 8, 9, 10, 11;
 12, 13, 14, 15, 16;
 22, 23, 24, 25, 26]
 
26]

Mat d, e;
a(Range(0, a.rows), Range(0, a.cols - 3)).copyTo(d);
a(Range(0, a.rows), Range(a.cols - 2, a.cols)).copyTo(e);
 
a.cols)).copyTo(e);

hconcat(d, e, d);
cout << endl << d <<endl;< p="">

<<endl;

[1, 2, 4, 5;
 7, 8, 10, 11;
 12, 13, 15, 16;
 17, 18, 20, 21;
 22, 23, 25, 26]
 26]