Source of BiCubic

[[ImageResize]]

- Cubic Convolution Interpolation for Digital Image Processing
--  http://verona.fi-p.unam.mx/boris/practicas/CubConvInterp.pdf

- Reconstruction Filters in Computer Graphics
--  https://www.cs.utexas.edu/~fussell/courses/cs384g-fall2013/lectures/mitchell/Mitchell.pdf