Image Interpolation

Bicubic Interpolation

Bicubic Interpolation

Bicubic interpolation takes it a larger grid.

$z={\sum }_{i\le 3}{\sum }_{j\le 3}{c}_{ij}\Delta x^i\Delta y^j$

• Result depends on 16 different $c_{ij}$ values
• Yields a cubic spline interpolation

Now, does this actually have any differences practically?

• Yes, you are left with artifacts when you are downsampling

If you want accurate results, you should do bicubic interpolation.

Method	Speed	Quality
NN	++	-
Bilinear	+	0
Bicubic	-	++