Wiener Filter

  
Figure 3: The Wiener filtering solution for image restoration.

The Wiener filter is the one that minimizes

If the measurement noise is white, this gives

The Wiener filtering approach is shown in Fig. 3.

Advantages

1. Begins to exploit signal
2. Controls output error
3. Straightforward to design

Disadvantages

1. Results often too blurred
2. Spatially invariant