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^^ ah, nicely spotted. indeed, you cannot reshape() a roi (without cloning).

@valentine, i got 2 other objections:

 int m = images[0].rows / x;  // y !!
 int n = images[0].cols / y;    // x !!

and:

for (int j = 0; j < images[i].rows - m; j += m) {
for (int k = 0; k < images[i].cols - n; k += n) {