27 March 1997 Joint transform correlators with spatially incoherent illumination
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Two variants of joint transform correlators with monochromatic spatially incoherent illumination are considered. The Fourier-holograms of the reference and recognized images are recorded simultaneously or apart in a time on the same spatial light modulator directly by monochromatic spatially incoherent light. To create the signal of mutual correlation of the images it is necessary to execute nonlinear transformation when the hologram is illuminated by coherent light. In the first scheme of the correlator this aim was achieved by using double pas of a restoring coherent wave through the hologram. In the second variant of the correlator the non-linearity of the characteristic of the spatial light modulator for hologram recording was used. Experimental schemes and results on processing teste images by both variants of joint transform correlators with monochromatic spatially incoherent illumination. The use of spatially incoherent light on the input of joint transform correlators permits to reduce the requirements to optical quality of elements, to reduce accuracy requirements on elements positioning and to expand a number of devices suitable to input images in correlators.
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Yuri A. Bykovsky, Yuri A. Bykovsky, Andrey B. Karpiouk, Andrey B. Karpiouk, Anatoly A. Markilov, Anatoly A. Markilov, Vladislav Gennadyevich Rodin, Vladislav Gennadyevich Rodin, Sergey N. Starikov, Sergey N. Starikov, } "Joint transform correlators with spatially incoherent illumination", Proc. SPIE 3073, Optical Pattern Recognition VIII, (27 March 1997); doi: 10.1117/12.270396; https://doi.org/10.1117/12.270396

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