This code is based on the Robert G. Keys' paper.
Keys, R. “Cubic Convolution Interpolation for Digital Image Processing.” IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. 29, no. 6, Institute of Electrical and Electronics Engineers (IEEE), Dec. 1981, pp. 1153–60, doi:10.1109/tassp.1981.1163711.
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