Bicubic interpolation

Extension of cubic spline interpolation

In mathematics, bicubic interpolation is an extension of cubic spline interpolation for interpolating data points on a two-dimensional regular grid. The interpolated surface is smoother than corresponding surfaces obtained by bilinear interpolation or nearest-neighbor interpolation. Bicubic interpolation can be accomplished using either Lagrange polynomials, cubic splines, or cubic convolution algorithm.

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