The Alabama A & M University Department of Physics Optics and Information Processing

Matched Spatial Filter

Matched spatial filters simulate correlation against an holographic filter. This filter includes both phase and amplitude information.

For example take the Alabama A & M University Logo:

We want to find the large letter "A":

We make a filter of "A" (using msf.m):

We then simulate the optical correlator (using optcorr.m), and finally obtain the magnitude squared (we normally use square law detectors, using magsqu.m):

Notice that the correlation peak is rather broad.