L. Bigue et al., EXPERIMENTAL IMPLEMENTATION OF A JOINT TRANSFORM CORRELATOR USING SYNTHETIC DISCRIMINANT FUNCTIONS, Optics and lasers in engineering, 23(2-3), 1995, pp. 93-111
A joint transform correlator (JTC) was implemented in the Optical Scie
nce Department at CERT. In order to ensure a rotational invariance, th
e reference image is replaced by a synthetic discriminant function (SD
F) image displayed on an amplitude spatial light modulator (SLM). Nume
rical simulations are performed and then compared to experiments. We s
how that the pseudo-inverse SDF (PI-SDF) gives accurate experimental r
esults. The training ability of the PI-SDF allows it to recognize the
reference object unambiguously, even if the input view does not explic
itly belong to the training set. Then, we propose to replace our ampli
tude device with a ternary phase and amplitude device, in order to dis
play positive and negative images: this allows us to display any kind
of SDF filters, e.g. OT-SDF or MINACE-SDF, which reduce the side lobes
, with a good resistance to noise.