23 lines
602 B
Python
23 lines
602 B
Python
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# lanczos2 kernel interval -2:0
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# generating 512 point LUT
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# 511 is centerpoint
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# lanczos defined as sinc(x) * sinc(x/a)
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# a is order (2)
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# sinc(x) = sin(x) / x
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# output format:
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# 0xNNNN, 0xNNNN, 0xNNNN, 0xNNNN, 0xNNNN, 0xNNNN, 0xNNNN, 0xNNNN, 0xNNNN, 0xNNNN, 0xNNNN, 0xNNNN, 0xNNNN, 0xNNNN, 0xNNNN, 0xNNNN,
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# x32 lines
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import numpy as np
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for j in range(0, 512, 16):
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lineString = ""
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for k in range(16):
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i = j + k
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x = (i - 511) / 256
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y = np.sinc(x) * np.sinc(x / 2)
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y *= 32767
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lineString += hex(int(y))
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lineString += ", "
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print(lineString)
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