| 摘要 |
<p>A pattern classification apparatus and a method of operating the same. The apparatus includes a volume holographic medium (4) having a plurality of Fourier-space volume holograms representing neural weighting vectors stored therein. The apparatus further includes a spatial light modulator (1) and a phase encoder (2). The spatial light modulator spatially modulates a spatially uniform laser beam in accordance with an unknown pattern. The two dimensional phase encoder spatially distributes the spatially modulated laser beam prior to application to the medium through a first Fourier transform lens (3). The apparatus also includes a detector (6, 11) having an input optically coupled by a second Fourier transform lens means (5) to an angular spectrum of plane waves generated by the medium in response to the output of the spatial light modulator, phase encoder, and first Fourier lens, where the plane waves correspond to vector inner products generated within the medium (4) in response to an unknown pattern. The apparatus further contains a means (12) for nonlinearly processing the output of the detector (6, 11) and a means (13) by which the output of the nonlinear processing means (12) may be temporarily stored.</p> |
