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A hybrid optical-digital method has been developed to obtain the wavelet transform of images by a piramidal descomposition of the Fourier spectrum in different ranges of spatial frequencies. It is applied to perform variant space and frequency filtering of images.
Pablo Artal
"Optical digital implementations of wavelet transform: application to image variant filtering", Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 198351 (26 July 1993); https://doi.org/10.1117/12.2308600
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Pablo Artal, "Optical digital implementations of wavelet transform: application to image variant filtering," Proc. SPIE 1983, 16th Congress of the International Commission for Optics: Optics as a Key to High Technology, 198351 (26 July 1993); https://doi.org/10.1117/12.2308600