23 March 1998 Binary phase-only 1/f joint transform correlator
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Abstract
We present a new means of creating a binary phase only 1/f joint transform correlator using a ferroelectric liquid crystal spatial light modulator. By using the two-pass technique of the 1/f JTC in combination with a binary phase FLM SLM it is possible to build a mechanically robust correlator with a correlation rate in excess of 2 kHz. By using a checkerboard phase encoded input, it is possible to use the FLC SLM as a binary phase modulator while also avoiding the problem of CCD camera saturation due to zero order. An edge enhancement algorithm is then used on the captured image to produce a suitable image for the second pass through the correlator. The algorithm has been chosen to produce a near perfect binary phase image which results in a correlation plane with greatly suppressed zero order (or dc terms).
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tim D. Wilkinson, William A. Crossland, "Binary phase-only 1/f joint transform correlator", Proc. SPIE 3386, Optical Pattern Recognition IX, (23 March 1998); doi: 10.1117/12.304791; https://doi.org/10.1117/12.304791
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