Importance

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Abstract

An optical correlator includes a first reflective mode spatial light modulator for inputting an input image and a second reflective mode spatial light modulator for inputting a reference image for comparing with the input image. The optical correlator also includes an optics arrangement for (i) directing light into the first spatial light modulator, (ii) directing light along a first optical path from the first spatial light modulator into the second spatial light modulator, and (iii) directing light along a second optical path from the second spatial light modulator into an image plane. The optics arrangement includes a first lens having a focal length f1 and a second lens having a focal length f2. The first lens is positioned substantially adjacent the first spatial light modulator and the second lens is positioned substantially adjacent the second spatial light modulator. In one aspect of the invention, the spatial light modulators have their individual respective backplanes formed as two separate portions of a single integrated circuit die. In another aspect of the invention, the optics arrangement is configured such that the optical correlator does not need to be configured as a 2f optical correlator with the length of the first optical path from the first lens to the second spatial light modulator being substantially equal to the length of the second optical path from the second lens to the image plane.

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First Claim