Blackman Window Function
[0.5, 0.5] -> 0
[127.33, 44.9] -> 187.835
[259.67, 21.43] -> 50.7001
[12.13, 61.79] -> 0
[89.5, 11] -> 133.418
[128, 128] -> 140.731
[127.255, 128.73] -> 156.227
[-1, -1] -> 0

