Efficient techniques to implenet correlation filters on fast SLMS

摘要

We propose a brief overview of different techniques to implement complex-valued filters on binary spatial light modulators (SMLs), including encoding techniques at both pixel=and cell-(i.g. group of pixels) levels. We show that group-oriented methods offer extended coding domains, at the expense of a reduced space bandwidth product and spurious noise in the correlation plane. We propose the concept of a time multiplexing technique that combines at the pixel level the pseudo-random encoding method with the minimum Eculidenan distance approach. This pixel-oriented method offers the advantage to keep the full space bandwidth of SLMs, and the possibility to very efficiently encode ternary filters {1, 0, +1} on binary phase {-1, +1} SLMs. Tested on a sequence of images acquired with an IR sensor in a tracking scenario (1 target), encoded ternary filter have offered superior performance in terms of peak-to-clutter ratio than classical BPOF (+ 45