Maximum filter over a sliding window.
MaxFilter[data, r]
MaxFilter[data, {r1, r2, …}]
MaxFilter[{1, 5, 2, 8, 3}, 1]
→ {5, 5, 8, 8, 8}MaxFilter[{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}, 1]
→ {{5, 6, 6}, {8, 9, 9}, {8, 9, 9}}MaxFilter[{1, 2, 3, 4, 100}, 1.5]
→ {3, 4, 100, 100, 100}