1 January 1995 On-board optical joint transform correlator for real-time road sign recognition
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Abstract
We design, implement, and test an on-board optical joint transform correlator, using a nonlinear optically addressed ferroelectric liquid-crystal spatial light modulator in the Fourier plane. This compact correlator performs real-time and on-board recognition tasks, such as road sign recognition. The influence of the nonlinearity in the Fourier plane is investigated, and scale-invariant filters are tested and implemented. Preliminary results from real-time dynamic scenario experiments are presented. Electronic and optical pre- and postprocessing as well as the extension to silicon backplane devices are discussed.
Laurent Guibert, Gilles Keryer, Alain Servel, Mondher Attia, Harry S. MacKenzie, Pierre Pellat-Finet, Jean-Louis M. de Bougrenet de la Tocnaye, "On-board optical joint transform correlator for real-time road sign recognition," Optical Engineering 34(1), (1 January 1995). https://doi.org/10.1117/12.183999
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