Geometrical transformations in optics

Details Geometrical transformations in optics Geometrical transformations in optics

1976-09-24

1979-02-06

Stern, Ronald J.

350 366, 350162SF, G02B 532, G03H 108, G02B 2738

Patent

active

041381904

ABSTRACT:
Geometrical image modifications such as coordinate transformations and local translation, inversion, reflection, stretching which require space-variant optical coherent systems are provided by introducing phase filters having a predetermined phase function into optical coherent systems in such a manner that the local phase variations influence light from local object areas. In one embodiment, the object distribution is multiplied by the phase function so that its spectrum at the frequency plane constitutes the desired transformation. In a second embodiment, the aforementioned concept is applied to produce a transformation in an image plane. The phase filters, in a preferred embodiment, comprise computer generated holograms.

REFERENCES:
patent: 3540791 (1970-11-01), Caulfield et al.
Goodman et al., Jour. of the Optical Society of America, vol. 63, No. 1, Jan. 1973, pp. 50-58.

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