Bilinear Interpolation

• Interpolate rows then columns (or vice-versa)

  • Increased complexity
  • Reduced aliasing

/* v is the zoomed (interpolated) version of u */

v1[m,2n] = u[m,n]

v1[m,2n+1] = a1*u[m,n]+a2*u[m,n+1]

v[2m,n] = v1[m,n]

v[2m+1,n] = b1*v1[m,n]+b2*v1[m+1,n]

1 2 1

1 2 1

4

2

2

H =

>> 4

• May be implemented as a 2-D FIR filter by H followed by a shift

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