A simple incoherent speckle technique for color image retrieval with white-light processing is presented. The technique does not rely on coherent speckles. The encoding is performed by using incoherent color illuminations of a diffused color object, with different slit orientations, during the specklegram constructions. Color image retrieval is then obtained by color spatial filtering in the Fourier domain of a white-light optical processor.
P. H. Ruterbusch,
F. T. S. Yu,
"Color Image Retrieval From Incoherent Speckles With White-Light Processing," Optical Engineering 21(4), 214798 (1 August 1982). https://doi.org/10.1117/12.7972979