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your point vec has 6 items, so the largest valid index is 5, and your loop should be:

  for (int i = 0; i < 5; i++)  // 6-1 because of vec[i+1]

your point vec has 6 items, so the largest valid index is 5, and your loop should be:

  for (int i = 0; i < 5; i++)  // 6-1 because of vec[i+1]

 im += img; // this should be removed !

your point vec has 6 items, so the largest valid index is 5, and your loop should be:

  for (int i = 0; i < 5; i++)  // 6-1 because of vec[i+1]

also:

 im += img; // this should be removed !
! (and use imshow("image", img);)