An alternative image multiplexing technique, employing a multiple-aperture
pupil for each exposure, is presented. The aperture arrangement of the pupi
l is modified between exposures. A thick photorefractive BSO crystal is use
d as recording material. The technique allows concentrating the spectral co
mponents of a pair of images selectively into isolated spots in the Fourier
plane. Two applications are proposed, in image processing and optical metr
ology. (C) 2000 society of Photo-Optical Instrumentation Engineers. [S0091-
3286(00)02712-4].