Bilinear Interpolation

• 
• $f(x,y)=(1-\beta )(1-\alpha )f_{i,j}+(1-\beta )\alpha f_{i+1,j}+\beta (1-\alpha )f_{i,j+1}+\beta \alpha f_{i+1,j+1}$
• Quadratic
• ik, jkl , il → ij