How do you interpolate between points in an image (2D), e.g. using splines?

1. Can splines be used for interpolation?
2. What is spline interpolation method?
3. How does 2D interpolation work?

Can splines be used for interpolation?

The Spline tool uses an interpolation method that estimates values using a mathematical function that minimizes overall surface curvature, resulting in a smooth surface that passes exactly through the input points.

What is spline interpolation method?

In the mathematical field of numerical analysis, spline interpolation is a form of interpolation where the interpolant is a special type of piecewise polynomial called a spline.

How does 2D interpolation work?

Two dimensional interpolation takes a series of (x,y,z) points and generates estimated values for z's at new (x,y) points. Interpolation is used when the function that generated the original (x,y,z) points is unknown. Interpolation is related to, but distinct from, fitting a function to a series of points.